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. He's also prone to getting upset if interrupted or questioned.
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. He seems to view himself as different to other people for some reason, wishing to be put on equal footing with everyone else.
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. At the same time, he is not above sacrificing himself for the sake of another person. He also appears to be oddly observant of other people's feelings, in contrast to his usual self-centered attitude.
Yuga is first seen among the students waiting for the exam to start. When the exam begins, Yuga comes across a 1-point robot villain, defeating it with his Navel Laser. After thanking Izuku for his "team-play", he tells him they will not cross paths again and flees the area to collect more points.
Yuga uses his Navel Laser to run the 50m in 5.51 seconds and for the standing long jump.
In the Obstacle Race, he is in last place and seems to have retained a fair amount of damage. He later is among the many asking to be on Katsuki's team (though Yuga, instead of asking, assumes that Katsuki would select him), but Yuga instead joins Hitoshi's team along with Mashirao and Nirengeki. His team places third, allowing him to participate in the final event, which is a tournament. When Mashirao decides to resign, Yuuga puts his hand on his shoulder and, despite knowing that he was being manipulated by Hitoshi, says that he will not give up. Yuga's opponent in the first round of the tournament is Mina.
Yuga faces his opponent, Mina, in his first round match. During the match, she causes his belt to malfunction, causing him to panic. She then attacks him with a one-hit KO to his jaw, knocking him out and eliminating him from the tournament.
Yuga along with his class watches the closing ceremony of U.A.'s Sports Festival.
Two days after the Sports Festival, Yuga is in class. During the Hero Informatics Period, Class 1-A has to decide on Hero Names. Yuga writes down and presents his: Sparkling Hero "I cannot stop twinkling." (輝きヒーロー・キラキラが止められないよ Kagayaki Hīrō Kirakira ga Tomerarenaiyo?) Midnight criticizes the name, thinking it is too long.
After Class 1-A have finished formulating their Hero names, Yuga is given a list of 40 workplaces in order to choose a workplace that he would like to train at. On the day of the workplace training, Yuga is at the train station with his class so that he can go to the workplace of his choice by train.
On the day of the exercise test, Mr. Principal reveals that Class 1-A will be fighting against U.A.'s teachers in their exercise test.
Yuga is paired with Ochaco and they must face Thirteen in their test exercise.
Yuga, Ochaco and Thirteen arrive in an uninhabited city where Class 1-A's test exercise will take place. In the city, Thirteen explains the 30-minute test; Ochaco and Yuga must either handcuff him or one of them must escape the battlefield within 30 minutes in order to win and pass the test. The test begins.
Ochaco and Yuga reach the escape gate but before they can go through it, Thirteen creates a Black Hole, causing the duo to hold onto a guardrail to prevent themselves from being sucked in. Yuga fires his Navel Laser from his knees (thanks to his Hero Costume) at Thirteen but the attempt fails as Thirteen easily sucks away the lasers. Ochaco tries to think of a plan, causing Yuga to surmise that Ochaco is thinking about what Izuku would do; Yuga then asks Ochaco if she loves Izuku, which shocks Ochako and makes her blush, causing her to let go of the guardrail out of embarrassment. As a result, Ochaco gets drawn towards Thirteen. Facing Thirteen directly, Ochaco uses her combat skills learned from Gunhead and manages to handcuff Thirteen, allowing her and Yuuga to pass the practical test.
Back in class at U.A., Yuuga learns that he passed the written test and will go with his classmates to the forest lodge which is a boot camp. Yuga along with his class go to Kiyashi Ward Shopping Mall to buy necessities for the forest lodge.
The next day after the shopping trip, at U.A., Shota informs Class 1-A that the destination for their lodge trip has been changed and the new destination will only be announced on the day of the event. The first semester has come to a close and summer break has begun.
On the day of the event, Class 1-A boards a bus that will take them to the forest lodge destination. An hour later, Class 1-A’s bus stops for a restroom break. However, Class 1-A notes that Class 1-B isn’t at the rest stop. Suddenly, two females wearing cat-like costumes and a small boy appear; the females excitedly introduce themselves as the professional Hero Team, The Pussycats. The black haired female explains to Class 1-A that they will be staying at the base of a mountain which is a part of their domain; they have three hours to reach the base of the mountain using their Quirks as they please and those who don’t arrive there by 12:30 pm won’t be served lunch. Soon, Class 1-A realize that they have already arrived at their destination and their training camp has already begun with the Pussycats being their supervisors. Some of Class 1-A try to leave, but Pixiebob uses her Quirk to create a landslide of dirt that causes Class 1-A to fall into a forest called Forest of Magic Beasts, which they must traverse to reach their destination. Suddenly, Class 1-A are confronted by a beast; Koji tries using his Quirk to control the beast but it does not work due to the beast being made out of dirt. Izuku, Shoto, Tenya and Katsuki mobilize and use their Quirks to destroy the dirt beast.
After Izuku, Tenya, Shoto and Katsuki destroy the dirt beast, Class 1-A begins traversing the Forest of Magic Beasts. However, the journey through the forest to the Cabin takes around about 8 hours. Class 1-A arrive at the facility, battered and tired. It is now 5:20 pm in the evening. Pixiebob admits that she thought they would take longer to get to the facility; she praises Class 1-A for figuring out her Earth Beasts quickly and easily. Class 1-A fetch their luggage from the bus and put it in their rooms. Class 1-A go to the dining hall to have dinner. After finishing eating dinner, Class 1-A go to the hot springs. The next day at 5:30 AM, Class 1-A are outside the training camp cabin. Shota greets his students and tells them that they will undergo reinforcement training to strengthen and upgrade their Quirks which will also allow Class 1-A to obtain their temporary licenses.
During the night of the third day, the Vanguard Action Squad attacks the training camp, filling the forest with poisonous gas and fire. Momo runs into Yuga and asks him to take the unconscious Kyoka and Toru back to the facility. Near the Vanguard Action Squad's rendezvous point, Yuuga hides behind a bush along with Kyoka and Toru. Yuga contemplates on what to do because he was instructed by Momo to take the unconscious Kyoka and Toru back to the facility, but Dabi and Twice’s presence are preventing him from doing that. Suddenly, Dabi spots the bush Yuga is hiding behind, much to Yuuga’s fear. Dabi prepares to go and check, however, he stops after Twice informs him that they must also call back Nomu since he only responds to Dabi. Yuuga is relieved that Dabi did not discover him.
Izuku, Mezo and Shoto land along with Mr. Compress at the Vanguard Action Squad's rendezvous point; they engage in battles against Himiko and Twice until Kurogiri arrives to retrieve the Vanguard Action Squad. Mr. Compress reveals that he hid the real marbles containing Fumikage and Katsuki in his mouth. Mr Compress slowly enters Kurogiri's Warp Gate. Suddenly, Yuuga fires his Navel Laser at Mr. Compress's face, breaking his mask and causing Mr Compress to spit out Katsuki and Fumikage.
Thanks to Yuga's actions, Mezo manages to rescue Fumikage and Shoto nearly rescues Katsuki only to be snatched away by Dabi. Dabi, Mr. Compress and the captured Katsuki teleport away from the training camp.
After the capture of Katsuki, the training camp ends and Yuga returns home. Two days afterwards, Yuga visits Izuku in hospital. After Eijiro and Shoto state their intentions to save Katsuki themselves, Yuga is also against the idea of attempting to rescue Katsuki along with the majority of the class; Yuga suggests that they leave Katsuki’s rescue to the Pro Heroes since they have been prevented from partaking in combat, to which Fumikage agrees with Yuga.
He uses his Navel Laser as a signal, attempting to sacrifice himself for Tenya, but is saved by the remaining U.A students.
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.
Hero Outfit: Yuga's hero outfit, though it may looked like it was meant to only looked flashy, its actually made of high tech so that he can channel his laser beam to other openings, such as his knees.
- Sparkle Shades: This equipment is so Yuga won't be blinded by his own shine.
- Sparkle Inner: This equipment is very high tech, as its design to send the energy emitted by his navel elsewhere on his body,
- Sparkling Emitter Gear: 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: 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 known U.A data is as follows:
- His name "Yuuga" (優雅?) means "elegance", while Aoyama (青山?) means "blue mountain".
- His favorite thing is himself.
- Horikoshi says he does not quite understand this character, but he is fun to draw so that is fine by him.