Oboro Shirakumo/Synopsis

History
On his way to start his second-year at U.A. High School, Oboro found a cat that Shota Aizawa left an umbrella over. He took the cat and the umbrella with him to class, where he arrived through the homeroom class window using a cloud he created with his Quirk. His teacher, angered, told him off for not using the door like everyone else.

Soaked from the rain, Oboro interrupted roll call to ask if anyone had a towel, although it was to no avail. He also asked Shota if he dropped his umbrella and, when he affirmed, handed it back to him.

Since his clothes were wet, Oboro decided to change into his gym attire in front of everyone. This caused commotion among his classmates, so he used a cloud to censor himself. Oboro pulled out the cat he rescued earlier from the rain, which was met with adoration from his classmates. He allowed roll to continue after getting dressed, and placed the cat on a cloud pillow.

Class 2-A's homeroom teacher began by reminding students that most second-years did work studies during summer vacation to get a taste of what the world of a Pro Hero was like. Oboro, Shota and Hizashi Yamada were reminded they have yet to pick an agency to sign up for.

Oboro and the rest of his class geared up for Joint Exercises with Class 2-B that consisted of Battle Training, Rescue Training, and Entertainment Lessons. He excelled in each exercise.

A few days later, Oboro's teachers discussed his chance of landing an agency. His homeroom teacher said he didn't have the grades, but made up for it with a positive attitude and, wherever he did go, he would manage at his own pace.

After school, Oboro, eating sushi, joined Hizashi, Shota and the cat he rescued on the school rooftop. The trio discussed the practical usages of Shota's Quirk, and Hizashi suggesed he should go the battler route so he could fight Villains on even terms, and Oboro commented that Quirk matchups can make or break a fight. Shota replied that he wasn't much of a fighter and that he didn't know what would he do against heavy brawlers. He started to explain his reasoning but was distracted by Oboro, who was trying to feed the cat his sushi. Shota told Oboro not to give him human feed, and gave his friend some school milk for the cat instead. Shota reminded him that animals aren't allowed at school, but Oboro just responded that he'd feel worse if he left the cat at home all day.

They were then interrupted when third year Nemuri Kayama, clad in her hero costume, spotted them having lunch on the rooftop, admiring their "youth" for their breaking of the rules. Oboro asked why she was there, and she explained that she'd just finished at her Work Study for the day and needed to do some paperwork at school before going home. Nemuri said that the roof was one of her favorite places, and Oboro was happy to learn she was also a rule-breaker like them. The trio noticed Nemuri's revealing attire, and Shota asked her if there was more to hero costume, jokingly wondering if it was made up of some high-tech material that was invisible to idiots. Oboro, oblivious to the joke, excitedly said that he is happy to be an "idiot." Nemuri explained the functions of her costume, leaving Oboro to admire her beauty.

After her explanation, Nemuri spotted the cat Shota is holding. Oboro explained that he and Shota were going to take care of it, but Nemuri exclaimed that they really shouldn't have animals at school, swiping the cat away. She asked the boys the cat's name, but they said they didn't yet have one for him. Pondering this, the third year asked each of them their favorite food, to which Oboro replied "sushi," and so Nemuri decided that would be his name. Oboro then hopefully told her they need to find a home for him, but Nemuri tells the them she can't take Sushi in because she's expecting to move after graduation, but also because it's harder to get married as a single cat owner. Nemuri said she'll have him temporally until the trio find him a proper home, but Oboro laughed and said that Nemuri would probably end up getting attached and keeping him for good.

The next day, Shota and Oboro hung out on the roof again. Oboro said that handing off Sushi was the most responsible thing they could've done, and Shota agreed that he'd be in safe hands with Nemuri. Oboro went onto say they weren't in any condition to take care of him themselves, and then began talking about Work-Studies. Hizashi had been assigned a battle-oriented one already, leaving them the last two without one.

Nemuri suddenly came up from the rooftop door and spotted the two, walking over to them. They thanked her for taking care of Sushi, and she showed them a clip of him she'd taken that morning. Disturbed by Sushi's bathroom video, they then asked her about her Work-Study and if she knew someone they could study under. Nemuri stated she knew the perfect place for little ones with nowhere to go, and told them that her boss would take anyone, inviting the two of them to join her.

Oboro and Shota accept her offer and begin their Work-Studies with His Purple Highness. A day on the field, a robbery is happening when Oboro and Nemuri enter the scene. Nemuri says Team Purple Revolution has arrived forcing the Robber Villain to use his Smoke Quirk. While the smoke is spreading, the Villain starts to escapes and Oboro begins to chase after them. Nemuri stops him and says the smoke could be toxic and they should prioritize evacuating the citizens. Oboro yells at Shota to stop the villain, but the smoke easily counters his Erasure, and His Purple Highness has to come to his aid.

After the villain escapes, His Purple Highness gives his trio feedback. Oboro is praised for his quick reaction without hesitation and good judgement. Oboro might be inexperienced but will grow from this. However, His Purple Highness criticizes Shota, but not for arresting the villain, but for his gloomy face. Mr. Purple advises him to smile more to transmit confidence and hope to folks in trouble.

Later that evening, Oboro and Shota are in the locker room. Shota is thinking about Mr. Purple's advice, but he is gloomy over letting the Villain escape which Oboro reassures him just to keep smiling even if you screw up. Shota receives texts from Nemuri of Sushi making him smile where Oboro points out his big happy smile.

Oboro now partly dressed ask Shota what would he do against the Villain if he encounters him again. Shota is slumped and doesn't know what he can do because the smoke irritates his eyes the closer he is and if he's to far away he can't use his quirk. Oboro knows it's a bad matchup even for him, therefore, suggest lending his goggles to Shota can get up and close.

A few days later, while patrolling Shota spots the same Villain again. Thanks to Oboro's goggles, Shota is able to advance closer, and temporally erase the Villain's Quirk. The Villain angrily attacks Shota but manages to dodge when suddenly Oboro jumps from his cloud and subdues the Villain with his quarterstaff. Oboro and Shota successfully immobilized the Villain and our victorious. His Purple Highness congratulations them both on their teamwork. Oboro and Shota smile triumphantly while the bystanders praise them for their work.

A new semester begins, Class 1-A and 1-B will be having Two on Two Battle Training together. Hizashi notices Shota has added Oboro's signature googles to his hero costume. Oboro happily tells Hizashi that their marketing themselves as a duo, but Shota disagrees and it was the for the sake of protecting his eyes and use of his Quirk. Sensoji interrupts the conversation that they stole his eye protecting idea. Oboro laughs it off.

The Battle Training teams are being selected when Oboro suggest that since Shota and him our doing their Work-Studies together they can team up. Class 1-A homeroom teachers agrees and thus Hizashi and Sensoji our paired as well. Before the two duos go against each other, Sensoji demands Shota to hands his googles over if they lose. Oboro accepts and wagers their googles against Hizashi and Sensoji shades. Oboro tells Shota the goggles symbolize their friendship and that they gotta defend them.

The matchup begins when Sensoji rushes in and uses Blast against Oboro and Shota. Shoto and Oboro dodge, where Oboro counters using his Super Move Cloud Cover to temporally cover his opponent sight. Oboro's clouds surround the battle field and Sensoji is about to blast all the clouds away when Shota comes from behind and erases his Quirk. With no way to defend himself Oboro lends the final blow with his quarter staff. Oboro and Shota our victorious. The wager is called off by Shota, causing Sensoji to storm off. Class 1-A teacher tells Oboro and Shoto they play off each other technical Quirks and to keep it up.

Later, Oboro is hanging out with Shota when Hizashi showcases his new googles to match the other two. Oboro happily once again now says we can sell themselves as a trio. Shota thinks Hizashi is coming to Purple Agency and Oboro corrects him that he's talking about the future, that the three of them can start their own agency. Hizashi and Oboro would start the combat and Shota would be the edge in battle to allow them the final blow. Nemuri shows up and admires the youths bantering. Oboro adds her into the agency now including all of them. Nemuri declines and states she rather be independent with young men waiting on her. Oboro states he wouldn't mind waiting on her and would later give her a pair of googles.

A week later, Oboro is patrolling Tasomiya Ward with Shota. Oboro creates a cloud to lend a ride for a group of nursery kids. Shota guides them and make sure they group looks both ways before crossing. Oboro comments that he's a natural with kids and suggest he should work at a day care or be a school teacher but Shota disagrees. The duo and kids say their goodbyes.

Oboro says Shota is observant and that he overthinks. Oboro believes Shota needs to stop psyching himself out and that he can do anything if he puts his mind to it. Shota doesn't believe he's good enough to work at a day care or be a teacher.

The conversation is interrupted when Nemuri gives an order to start evacuating the area because a powerful Villain is causing havoc. The duo run back to the kids, where Oboro creates a cloud once again now to guide them to safety. Garvey comes into their view causing them to panic. His Purple Highness comes in, to buy them some time so they can focus on the kids. Due to Garvey's Quirk, he releases Hizashi's Voice and Sensoji's Blast onto the city causing destruction. Rumble starts falling on the kids, when Oboro creates a cloud above them to shield them. Due to protecting the kids, Oboro is left defenseless and gets crushed by the rumble. Shota screams for Oboro with no response causing the kids to cry.

Shota faces Garvey head on, hearing Oboro's voice guiding him. Shota successfully defeats the Villain, and yells that "I did it!". Shota is being praised for his action when he interjects and say it was a team effort with his partner, Oboro, cheering him on. Shota asks Nemuri how Oboro's wounds are looking but she doesn't answer. Thinking the worse Shota tells her that he should be taken to the hospital immediately.

Nearby, Hizashi and Sensoji spot Oboro's speaker and pick it up. They notice it's broken when Shota says that can't be true. Shota tells them Oboro voice was cheering him on the entire time, but Sensoji tells him it was likely he was giving himself a pep talk and imagine it was Oboro. Shota brushes Sensoji comment off and believes it was his actual voice. Shota approaches the rumble where Oboro was knocked out and sees Oboro's body bag covered in blood.

After his body is removed from the area, Nemuri tells Shota and Hizashi they should get inside. Hizashi tells her the rain fits the mood they're in and not to worry. Shota remembers all his memories with Oboro, and with Hizashi by his side they mourn the loss of their friend.

Joint Training Arc
After the U.A. faculty conference, where Hitoshi Shinso was officially admitted to the Hero Course, Present Mic brings Oboro up to Shota as they are walking down the hallway.

Current Arc
During school, Shota Aizawa and Hizashi Yamada are called for urgent business.

On their way to Tartarus, they begin talking about the U.S.J. Incident where Shota fought Kurogiri briefly and saying that "it can be him". When they met up with Naomasa Tsukauchi and Gran Torino and are told how Nomus are bioengineered, not living people in short puppets. Naomasa explanation continues that they couldn't get Kurogiri to speak about the League of Villains but his Quirk is artificial and was created by multiple Quirks. The Quirk acting as base resembling their late friend Oboro.