Prince Caerulus Melodia Equestria

"Whatever I will become will be what the higher powers has chosen for me."

- Blue Suede Heartstrings

"Bein’ humble is good, but bein’ too humble hurts as bad as havin’ too much pride."

- Prince Caerulus Melodia Equestria

Prince Caerulus Melodia Equestria, born Blue Suede Heartstrings (his entries here and here) is an ancient Alicorn god and currently a divine sovereign who originated from the early Second Age, and is the younger identical twin brother of Bossa Nova Heartstrings.

Appearance
As a mortal, Blue was an incredibly handsome unicorn stallion with a bright yellow-orange pelt, an average-sized horn, and a dark blue mane and tail. He usually appears a Greaser, styling his mane into a pompadour while wearing a black leather jacket and a pair of black sunglasses. His Cutie Mark is a red, heart-shaped electric guitar from the Second Age, representing his talent/passion for music and his kind personality. His fame, popularity, and appearance has played a direct role in the birth of the Greaser movement in both the Second and Fourth Ages, with people like Blue Goldstone being part of this movement.

Post-Ascension, Blue became a tall and handsome Alicorn god with a long horn and a pair of great wings. Because of his age, his feathers sport a dark blue gradient. Height-wise, he's taller than Queen Dazzleglow and Prince Sparkling Wing, but shorter than Emperor Golden Scepter and Luminiferous due to them being "older" Alicorns. Blue's mane and tail have grown longer and become composed of dark blue energy soundwaves with lighter blue musical bars and notes running through them. His Cutie Mark also changed with his Ascension, being flanked by a pair of white wings and surrounded by a halo of light blue musical notes, representing his transition into something divine. Because he is a "prodigy" deity, his physical and magical growth is accelerated compared to normal deities, and already sports signs of growing a second pair of wings. He only reveals this form when it's absolutely necessary, such as confronting dangerous entities that he cannot fight while in his mortal forms.

Because he embodies Performance as a concept, Blue has appeared as various members of mortal over the course of three Ages, such as a Deer, a Griffon, a Diamond Dog, an Abyssinian feline, a Dragon, a Kangaroo, a Qilin, a Kirin, and even a Changeling. However, two things common with these forms is that they're all incredibly handsome by their race's standards, and they all have deep yet smooth and pleasant singing voices with a southern Ponyland accent. His forms also depend on where he is at the moment.

Hilariously, he has been mistaken for Flash Sentry, a pegasus Royal Guard and a friend of Princess Twilight Sparkle. Due to their similar color schemes, Blue has been speculated to be either Flash Sentry's relative or ancestor. The same could apply to Roneo, a former resident of Sunnytown.

Personality
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Copper Wheel Heartstrings
Copper Wheel Heartstrings is Blue's father.

Sunny Love
Sunny Love is Blue's mother.

Bossa Nova Heartstrings
Bossa Nova is Blue's older identical twin brother.

Prince Shamrock Bloom
Prince Shamrock is Blue's godson.

Record Beat
Record Beat was Blue's first coltfriend and later, his first husband. Blue met Record Beat while the former was battling depression and grief following his parents' deaths, and it was from there that they fell in love and got married. However, because same-sex relationships were taboo in Ponyland at the time, Blue and Record Beat faced discrimination and scorn from many disgusted people, including some of Blue's own fans. Blue's relationship with Record Beat also caused him to be blackmailed by his then-record manager, "Colonel" Hollow Note, setting up a chain of events that led to the King of Music ultimately quitting his job as a musician and taking up globetrotting instead.

Blue would later discover that his meeting with Record Beat was engineered by Bossa Nova, who wanted to help his younger twin brother recover from his depression by setting Blue up with Record Beat, who had a crush on him. While Blue was mad at Bossa Nova for manipulating his life, he later acknowledged and admitted that if his brother hadn't interfered, he would have remained stuck under Hollow Note's hooves, unable to get out.

Despite this, Blue loved Record Beat very much and was completely faithful to him. He also let Record Beat accompany him on his global travels after he quit his job. Their marriage would last up until Record Beat died from old age, after which Bossa Nova would personally usher him into the afterlife as a reward for taking such good care of his brother.

Lyra Heartstrings
Lyra Heartstrings is Blue's Fourth-Age descendant through one of his deceased lovers, though their connection had long been the subject of rumors and speculation before it was actually proven true. Blue has supported Lyra's musical career, and has reportedly blessed Lyra's relationship with (and later marriage to) sweetheart Bon Bon/Sweetie Drops. It was through meeting Lyra that Blue ended up meeting many more Ponies in Ponyville, such as former Sunnytowners Roneo, Gladstone, and Three Leaf.

As for Lyra, she was utterly shocked when she discovered her biological relations to the King of Music. Bon Bon/Sweetie Drops wasn't all that surprised, though, seeing that being related to Blue explained a lot about Lyra such as her love for music.

Amina
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Melody
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Bon Bon (Second Age)
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Sweetheart
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Bright Eyes
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Clover Bloom
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Mercy
At some point, Blue met Mercy, a sentient divine sword and Prince Red Blade's adoptive daughter. Golden Scepter mentioned to the Four Terrors during a meeting with them that Mercy became a huge fan of Blue after the encounter.

Sola Mors
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Blue Goldstone
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Fluttershy
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Rainbow Dash
Blue has a friendly relationship with Rainbow Dash. While the two were sampling some of Blue's early songs, Rainbow thought his early music sounded "weak" and "tame", but felt reluctant to say it to his face. Though Blue psychically senses this, he takes it in stride and explains to her that in his time, people "gasped and raged at anything [they] thought were indecent".

Gladstone
Blue deeply sympathizes with Gladstone's trauma over losing his parents to Cutie Pox, as he himself had gone through a period of depression after losing his own parents, and helped Gladstone come to terms with it. Blue also sympathizes with Gladstone's desire to protect Roneo, since as a father, he understands what it's like to fear for his children and loved ones when they eventually leave him and die of old age. However, he also acknowledges the importance of letting go, and points out to Gladstone that Roneo is now a young stallion and needs to make his own choices.

When this causes Gladstone to freak out, Blue comforts him and explains that constantly protecting Roneo will cause him to become dependent on his older brother, leading to them both suffering as Gladstone runs himself ragged trying to protect someone who expects him to bail him out every time something happens. He assures Gladstone that while Roneo might still get hurt, the experience he'll get from making his own choices and mistakes will allow him to become stronger and more independent. This, combined with therapy, finally convinces Gladstone to let Roneo do his own thing, leading to Roneo making a name for himself as a rising song-writer and playwright.

It is believed that Gladstone is one of Blue's descendants by virtue of being Roneo's brother, but Blue has never confirmed or denied this.

Roneo
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Three Leaf
While he visited Lyra Heartstrings in Ponyville, Blue came across Three Leaf by sensing the latter's emotional suffering. As they interacted with each other, Blue realized that Three Leaf was still being affected by her deeply abusive friendship with Grey Hoof despite leaving Sunnytown. Despite his disgust with what Three Leaf and the other Sunnytowners had done to Ruby Heart and others, Blue is so compassionate that he nonetheless wanted to help her, and used his domain of Philia Love to sever Three Leaf's ties with Grey Hoof after agreeing to fulfill Ruby Heart's quest to help her.

This left Three Leaf utterly baffled as to why Blue helped her, as she believed she didn't deserve it. Blue replies that it's "the right thing to do" and compares her emotional and mental suffering to living a very long time in "Heartbreak Hotel", which he sees as a terrible, sad, and lonely place that Three Leaf needed help getting out of. Blue's intervention ultimately helped Three Leaf make progress in her psychological recovery, as she was finally able to receive closure from realizing that Grey Hoof is not who she thought he was and had become an insane stallion. This later influenced her to start a support group for her fellow Sunnytowners so she could help them recover from Grey Hoof's psychological abuse and conditioning.

Blue has also become Three Leaf's mentor in music by teaching her how to sing. When he learned that Three Leaf befriended Lyra Heartstrings, his Fourth-Age descendant, Blue approved and blessed their friendship. During the "Judgement Day" attack on Ponyville, he quickly defeated some mortal followers of the Poenan Pantheon for targeting Three Leaf.

Queen Aoide
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Princess Mese
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Queen Ithomiini
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War Rock
During his life as a mortal, Blue has been a rival of War Rock due to both of them being extremely talented and popular musicians. Both of them are almost complete opposites of each other - while Blue was very humble and became a musician out of love for music, War Rock was arrogant and entitled, and became a musician for fame and glory. Blue's songs were very emotional and uplifting to those who heard them, while War Rock's songs were essentially boasts that uplifted himself. War Rock despised Blue as he couldn't tolerate the possibility of the latter being better than him, so he tried sabotaging Blue's career and/or killing the King of Music so he wouldn't be surpassed by his rival. The final straw that led him to villainy was discovering that Blue managed to Ascend to godhood, causing War Rock to realize that he would eventually die and be forgotten while Blue would eclipse him in both life and fame.

Due to his humility, Blue didn't take his rivalry as seriously as War Rock did. He is disgusted by War Rock's behavior and actions, and sees him as the symbol of everything he hated about both entitled musicians, and the music industry in general. After Ascending to godhood, he would clash with War Rock several times. Being an Alicorn god, Blue had a major advantage in his divinity, which allowed him to foil War Rock's plans and defeat him on multiple occasions. Despite the animosity, Blue genuinely respected War Rock's musical talent and intellect, and regretted not being able to help his fellow musician realize the error of his ways and humble himself. He also felt rather uncomfortable when he received a massive spike in popularity after War Rock's death, with many of War Rock's former fans flocking to the King of Music out of disgust towards his crimes and rampant narcissism.

"Colonel" Hollow Note
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Tribalists
Due to personal experience with tribalists in the Second Age, Blue is a bitter enemy of tribalism and has clashed with tribalists for three Ages.

Autorists
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Poenan Pantheon
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Professor Bubbling Beaker
Blue was disgusted with Bubbling Beaker's horrific experiments and the deaths he caused trying to crack the secrets of Ascension. When he learned that Bubbling Beaker looked to him and other Ascendant deities for inspiration, Blue felt ashamed and angry knowing he inspired a mad-stallion to kill countless foals and teenagers.

Vicearch Iniquitous
Despite Iniquitous

Tribal/Racial Magics
As an Alicorn god, Caerulus can wield combined magics of all mortal Pony tribes, including the magics of Musical Ponies, Sea Ponies, and Flutter Ponies. As a former Unicorn, he specializes in Unicorn magic, but he has used Earth pony magic to enhance his strikes and physical endurance on numerous occasions.

Following his crowning as a Prince, Caerulus proved himself to be extremely adept with music-based magic, which allows him to use and create even more music-based spells on top of what his Music domain gives him. He would teach Winter Opera how to use this type of magic as well.

Music Domain
As a god of Music, Caerulus possesses an extremely impressive mastery over music in general, which is appropriate given his origins as a mortal musician. Like Mier, the Bogolenya Deer goddess of Peace, he can calm/soothe listeners with music, but he can also uplift his listeners' spirits by inspiring joy and hope. He can empower allies physically and magically with music, dispel the effects of fear and hatred-based spells with music, and heal others with music. In regards to his music-based healing, Caerulus has found ways to heal deaf individuals by healing them through percussive vibrations, which he can create by stomping the ground or any surface with his hooves in rhythmic patterns. For wide-scale effects, he can generate an energy-based stage and extra magic instruments for fellow musicians to play with, allowing his magic to reach farther than ever. In terms of offense, Caerulus can generate solid magical constructs of musical bars and notes to slam and crush his enemies, fire beams of musical energy, and grow sound wave "tentacles" to restrain and strangle his enemies.

In relation to his Music domain, Caerulus can use sound-based magic. He has a beautiful singing voice that hypnotizes people and/or lulls them to sleep. He can also unleash powerful, disorienting screams, induce vertigo in his targets, and nullify sound indefinitely, making the ability perfect for stealth. In regards to sound nullification, he can make something/someone incapable of generating sound, but loathes using it since it leaves his targets unable to listen to his music. Some of his most powerful techniques include inducing violent earthquakes via sending powerful soundwaves through the ground, creating powerful shockwaves to damage and blow back multiple enemies, and creating multiple sound-based illusions to distract his targets.

As a side-effect, Caerulus' Music domain grants him better hearing compared to most deities, accompanied by natural resistance to keep him from going deaf.

Following his psychological recovery and crowning as a Prince, Caerulus gained new abilities pertaining to his Music domain. He can magically increase/decrease the volume of any music or sound at will. whicch can be used to disorient or deafen people. He can manifest his sound magic as pure magical vibrations to pinpoint weaknesses and weaken/shatter things by matching their vibration frequences, such as structures, weapons, and even armor. One of his most dangerous abilities is his ‘empathic voice’ - by combining empathy with his Music domain, Caerulus can make people feel happy, sad, terrified, angry, or depressed depending on what kind of song he sings.

At one point, Caerulus once used his 'empathic voice' to save a small kingdom from persecution by an Autorist empire, by singing about the horrors of their hatred and the long-lasting effect it will have on their own children. Overcome with guilt and shame, many soldiers of the empire deserted in droves, causing it to collapse from the combined efforts of benevolent heroes and an internal resistance due to lack of sufficient forces.

Humility Domain
As a god of Humility, Caerulus has telepathic and empathic abilities that allow him to sense and encourage humility in people. He can project an empathic aura that lessens unchecked pride, and is strong enough to counter the nature and powers of evil Pride deities like Stoltur. He also has precognitive sight that shows him shows him good and bad futures depending on whether people develop humility or not. His precognitive sight is similar to Clover's Humility-based precognition, except Clover's version gives her more powerful and accurate visions based on how humble she is. He can "emotion-bomb people by making them feel the suffering they have inflicted on others with their arrogance, though he initially disliked hurting people that way.

Following his psychological breakdown and recovery, Caerulus gained new abilities pertaining to his domain. Under the tutelage of various Virtue and Psionics deities, his psychic powers were boosted to the point where he can detect and moderate levels of humility in people. For example, if Caerulus sees someone becoming too humble, he encourages them to feel good about their strengths and accomplishments, and to accept and feel comfortable with themselves while acknowledging their own flaws. His precognitive abilities increased, allowing him to see not only what happens if prideful people become humble, but also what happens if people fall into the more dangerous aspects of humility. In addition, he possesses a degree of purifying magic that allows him to get rid of certain curses, especially pride-based curses.

Caerulus' domain of Humility ironically allows him to wield various curses and hexes, something he proved to be natural at while learning under deities like Pakak, the Draconequus god of Karma and Mischief, and (supposedly) Vicearch Iniquitous. These curses and hexes are often used as punishment for various wrongdoings, and range from simple bad luck to karmic transformations. This is symbolically tied to the humiliating aspects of Humility, as sometimes a prideful person must go through a humiliating situation in order to make them acknowledge their vices and learn humility.

Lastly, Caerulus can combine his Humility-empowered magic with Stoltur's Pride-empowered magic to create a devastating energy attack, which Cultura calls a "Yin-Yang Bomb". This is thematically tied to how pride and humility are both important to sapientkind's emotional well-being, as pride brought on the Colonel's defeat and allowed Caerulus to finally heal from his abuse-related trauma.

Performance Domain
As a god of Performance, Caerulus is an expert performer and actor by divine standards. He has peak physical speed and agility that allow him to run and dance exceptionally well, no matter where he is. He has shapeshifting abilities and voice mimicry, allowing him to blend in with mortals unnoticed despite being a god. His disguises are enhanced by the fact that Blue is very good at masking his own Primordial Quintessence. However, his mortal disguises are not perfect, as Truth deities can see right through him while Psionic deities (and those with very strong psychic powers) can still sense something off about him.

A unique ability granted by Caerulus' domain of Performance is his ability to psychically sense the quality of performance arts produced by others, especially music, allowing him to see if other musicians have truly put their heart and soul into their own work. Many people assume that the flashier, bigger, and more expensive a concert is, the better it is overall, but Blue strongly disagrees, as it is the music that provides the backbone of any concert and determines whether a concert is doomed to fail or not, regardless of its flashiness.

Following his psychological breakdown and recovery, Caerulus gained two new abilities. One is the ability to magically force his targets to dance indefinitely to either the point of exhaustion, or dying from it. This can serve as a great distraction, but Caerulus has used it on corrupt managers as karmic punishment for abusing their clients by making them do 'encores' by his demand. Another ability involves magically generating various props for himself and others to use in their performances, which comes i handy when Caerulus needs something to attack with.

Love Domain
As a god of Love, Caerulus specifically embodies the concept of Philia Love, otherwise known as friendship. He can see the bonds that tie people together as friends, which manifest as magical rope that become frayed once a friendship(s) is damaged. This allows him to seek out those with troubled friendships and help mend them. He has a more dangerous ability in magically severing friendship bonds, but he only uses it in situations of necessity, such as freeing those who were magically coerced into subservience or helping them get out of abusive friendships that they otherwise can't by themselves. This echoes how Caerulus himself broke free from both toxic media industries and the people associated with it, and gained more friends by staying true to himself, thanks to the influence of benevolent individuals like Luminiferous.

Following his psychological breakdown and recovery, Caerulus gained abilities similar to Princess Amicitia’s Friendship domain. He can empower himself based on how much Philia Love is present in others, becoming nigh-unstoppable if there’s a lot of it. He can empower others through his and others’ friendships with them; and since he and his friends are very close, they tend to become super powerful. He also has curses to punish those who abuse their friends or break friendships for cruel reasons - one such curse gives the target a hateful presence that causes people to flee or turn away in disgust and scorn, which goes away once the target repents for their actions.

Other Skills
Outside of his domains, Caerulus is a prodigy musician who not only revolutionized the Rock and Roll genre and introduced it to the mainstream, but also holds great knowledge and versatility in music in general, as he experimented with various other genres. He holds a great auditory memory that allows him to remember certain songs and sounds even three Ages later. He has experimented with different genres, which led to him producing a large body of work inspired by (in his words) jazz, pop, gospel, country, modern rock, and a bit of Oceanic music.

In addition to his musical skills, Caerulus can dance very well. This skill is enhanced by his Performance domain, which gave him peak physical speed and agility.

Caerulus is a veteran soldier who fought during the Second Martian-Tellusian War, which gave him experience in close-quarters-combat and usage of Second Age military weaponry. He has taught many deities how to fight like him post-Ascension, such as several members of the Trimortidae. After joining the Equestrian Pantheon, he taught many of its young members so they could have some measure of self-defense, should they be unable to use their magic for some reason. However, Caerulus is outclassed by deities who embody War and similar domains, and will get in trouble if he gets into a fight with such an individual.

Weapons/Equipment
Caerulus wields a heart-shaped 'magitek' guitar called Burning Love, built in the Third Age to replace the electric guitars of the Second Age following the restoration of magic. Burning Love has served as a conduit for his powers, especially those derived from his Music domain. It has also been used as a blunt-force weapon on numerous occasions. However, should he loose it, Caerulus would be rendered unable to use his Music domain effectively.

Background
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Trivia

 * Blue Suede Heartstrings is based on Elvis Presley. Both of them were extremely famous and popular musicians who popularized the rockabilly genre (though they would state they didn't invent it) and were named "The King of Rock and Roll", a title they both hated. They also grew up with religious yet loving parents, whom they were close to, influencing both of them to believe that the true "King" is a god, not them. During their music/movie career, both Blue and Elvis were handled by a manager who ruthlessly exploited them for financial gain. But unlike Elvis, who wasted away in his later years under "Colonel" Tom Parker until his death, Blue managed to break away from his manager thanks to the subtle interference of his older twin brother, Bossa Nova Heartstrings. This kicked off a series of events that, after meeting Luminiferous during a very low point in his life, led to Blue quitting the music industry altogether and Ascending to godhood.
 * The first two parts of Blue Suede's Alicorn name, Caerulus Melodia Equestria, translate to "Blue Melody" in Latin.