Yuga has a slim body and slightly long blonde hair, along with long eyelashes and bright eyes, giving him the appearance of a young prince.
His Costume is violet in color, having the shape of a lean knight's armor, also possessing a belt with a ring-shaped buckle that allows him to use his Quirk. Besides that, he wears a wing shaped visor.
Yuga is a vain and prideful person, thinking of himself as superior to the rest of his classmates, especially in regards to his Quirk. He exhibits extremely flamboyant mannerisms, is fond of posing and likes to grab the attention of those around him, although he frequently gets ignored. His expression rarely changes from a closed smile, even while he speaks or gets hurt, and he's also prone to getting upset if interrupted or questioned. Yuga's sentences often end with a star (☆) symbol, indicating a lofty tone. He also tends to gives the impression that he's French, occasionally implementing French words into his sentences.
However, this is shown to be mostly a farce, as Yuga does hold some insecurities about his Quirk, and in reality, he doesn't see himself as above anyone else. In fact, he appears to think of himself as different from everybody, due to the defective Quirk he was born with. Yuga has been struggling with this since his childhood and wishes to become "normal" one day.
Yuga does possess a hidden compassionate side and is shown to sympathize with Izuku Midoriya due to the both of them having what he perceives as highly hurtful, uncontrollable Quirks, although the way he uses to display this sympathy can come off as unintentionally creepy and questionable. Izuku has stated that he’s never been able to read Yuga due to his unpredictable nature, although he still ended up befriending him.
Yuga is also easily frightened by danger and prefers to hide rather than fight, though he can still help out a friend as long as he remains safe and isn't above sacrificing himself, which was seen when he attacked Mr. Compress from taking Fumikage Tokoyami and Katsuki Bakugo. This brave act nearly put his life at risk but ended up saving one of his classmates from being kidnapped, which highly contrasts his usual self-centered atittude.
Quirk and Abilities
Navel Laser (ネビルレーザー Nebiru Rēzā?): Yuga's Quirk allows him to shoot lasers out of his navel. If he uses it too much, his stomach will apparently collapse. However, with the help of his Hero Costume, Yuga is able to transfer the energy to his shoulders or knees and shoot out lasers from them.
- Art of Seduction (据え膳 Suezen?): Yuga places his hands behind his head and fires a laser from his navel. This move is first used to destroy a robot during the entrance exam.
- Navel Laser Buffet (ネビル ビュッフェレーザー Nebiru Buffe Rēzā?): Yuga fires successive beams not only from his navel, but also from his shoulders, which are equipped with beam openings just like his Sparkle Belt. As a result, this technique puts more strain on him than when he uses his Quirk normally.
Hero Outfit: Yuga's hero outfit, though it may look like it was meant to only look flashy, its actually made of high tech so that he can channel his laser beam to other openings, such as his knees.
- Sparkle Shades: (キラメキ グラス Kirameki Gurasu?) This equipment is so Yuga won't be blinded by his own shine.
- Sparkle Inner: (キラメキインナー Kirameki Innā?) This equipment is very high tech, as its design to send the energy emitted by his navel elsewhere on his body,
- Sparkling Emitter Gear: (キラメキ噴出セット Kirameki Funshutsu Setto?) This equipment is divided in five "sparktacular" sparkle items that focus the sparkle energy transmitted by his "Sparkle Inner" into a single sparkling sparkle beam.
- Sparkle Belt: (お手軽キラメキベルト Otegaru Kirameki Beruto?) This equipment a simple yet convenient belt that Yuga wears everyday.
- Yuga's early design was very similar to how he currently looks, aside from slightly longer hair and different pants. His hero name was also supposed to be "Can't Stop Twinkle" instead of "Can't Stop Twinkling".
- Yuga's name "Yuuga" (優雅?) means "elegance", while Aoyama (青山?) means "blue mountain".
- Yuga's favorite thing is himself.
- Yuga's known U.A data is as follows:
- Horikoshi says he does not quite understand this character, but he is fun to draw so that is fine by him.
- Yuga's voice actor, Kosuke Kuwano, also voices Hiryu Rin from Class 1-B.
- With his birthday taking place in late May (two days after Mashirao's), Yuga is the third oldest student in Class 1-A, as everyone was 15 when they started U.A.'s school year in early April.