Nine/Synopsis

History
Nine is a villain who was born with a very powerful, almost "god-like" Quirk that allows him to control the weather. With his ability, he can summon destructive thunderstorms in an instant and even create a powerful tornados.

Being the possessor of such power caused Nine to be disturbed by the world's hierarchy of authority, which he considered flawed, as it's one where the weak rule the strong. So he wants to create a world where those with strong powers rule over those with weak or no powers. Over the years, Nine recruited other individuals such as Chojuro, Kiruka and Hoyo who, like him, feel oppressed by the current failed world, and together they would try to make their dreams come true.

However, the only obstacle that prevented them from carrying out their plans is nine's own powerful Quirk, as the magnitude of its power causes cellular damage to Nine’s body, and it would eventually end up killing him. Looking for a way to find a cure for his illness, Nine told his teammates that he plans join the League of Villains to undergo an experiment by Dr. Kyudai Garaki.

Dr. Garaki conducted an interview to find out why he wants to undergo his experiment, and after hearing Nine's explanations, and concluded that he s definitely a perfect candidate, noting that his mind and body are in the right condition. The operation consists of grant him a copy of the All For One's own Quirk, although this is something that Nine ignored. Despite not knowing what the experiment would do to him, he felt like everything will turn out fine. As Nine was sealed up for the experiment, he noted that he will create an ideal world not only for himself but for his teammates as well.

My Hero Academia: Heroes: Rising
After several months of operation, Dr. Garaki manages to adapt the All For One factor to Nine's body. With the operation completed successfully, Garaki requests the League of Villains to transport Nine in an armored truck to a specific point. When they ask what it is, the Doctor simply tells them that it is something that has nothing to do with them. Although they do not like to be treated as simple delivery men, Tomura Shigaraki agrees to his request.

Somehow, the information of that delivery is leaked and the heroes set up an ambush on the mountain road they are going to pass. A fast-paced chase ensues when the heroes try to stop them. Despite the opposition shown by the members of the League, the truck ends up crashing. However, when the heroes investigate the crashed vehicle, Nine had already escaped from the scene, reuniting with her allies at the specific point.

Nine tells them that the operation was a success, obtaining great power but also worsening the symptoms of his illness. Chimera considered that the operation was for nothing then, but Nine corrects him saying that it is not true, because with his new power, he only needs to steal a Quirk to help him to overcome his illness, and in this way, he will be able to build the utopia that they had always dreamed of.

During the following weeks, Nine and his group attack various heroes and steal their Quirk. One day, they end up attacking a civilian, Mr. Shimano who is on a business trip in Kyushu, watches a video recording of his children before he was attacked by Chimera. Nine uses his Scanning quirk to scan him and proclaims that he has found what he was looking for. He then uses his All For One Quirk to steal and absorb Mr. Shimano's Cell Activation Quirk.

When Nine takes Mr. Shimano's power, he uses his original Quirk Weather Manipulation to call lightning down to destroy parts of the city. Nine and their groups are excited that they can finally put their plan into action to fulfill their dreams. Nine then freezes up in pain as his cells begin to degenerate, and he realizes that Mr. Shimano's Quirk isn't compatible with him because it only works on A-Type blood and he is B-Type.

Chimera laments over the team's struggle to cure Nine being worthless, but Slice shows them the video recording of Mr. Shimano’s children, Katsuma and Mahoro. Nine remembers that Quirks are hereditary, and decides to aim for the kids as one of them must have a Quirk that is similar to their father that might be compatible with his body.

They hijack a ferry to travel to Nabu Island and crashed the ship into the harbor once they arrive. Nine orders his teammates to cause much destruction as possible in order to isolate the island from the outside as well as divert attention from their true goal while he hunts down the siblings. What neither of them didn't count is that all the students from Class 1-A of the U.A. High School are on the island for the Hero Work Recommendation Project. When they notice the attacks, the students confront the villains. Mummy is defeated and captured.

Nine finds the children, and using his Scanning Quirk discovers that Katsuma has the Quirk he was looking for. Nine is about to steal boy’s power when Izuku and Katsuki appear to protect them and fight him. The determination of both students forces Nine to use their Wheater Manipulation, causing disease takes over him after defeating Izuku and Katsuki. Slice arrives to take Nine away and signal to her fellow villains to retreat, at the same time the Shimano siblings, Izuku and Katsuki are rescued by their classmates.

The next morning, after recovering from his illness in a lighthouse, Nine is determined to take Katsuma no matter the cost. Slice informs him that the students of the U.A. have sheltered all the inhabitants of Nabu in the vast underground caves under the ruins of Mount Shiroyama. He and his allies make their way to Mount Shiroyama, where the students were waiting for them. During the previous night, Izuku and his companions had devised a plan to deal with the villains, and particularly defeat Nine by taking advantage of his illness.

When the students see the villains are close enough, they put their plan into action. Yuga Aoyama and Momo Yaoyorozu start attacking them from afar with their respective Quirks at full power. While Nine blocks the attack with his Air Wall Quirk, Slice and Chimera breaks away from the blast, unaware that they are falling right into their trap.

With their attack, Class 1-A students manage to separate Nine from his allies. Then the students take turns attacking him as they had planned. Despite their attempts to stop him, Nine gradually defeats the students, until it’s Izuku and Katsuki's turn to face him. After a tough fight, they finally get Nine to his limit and the backlash of overusing his quirk kicks in.

In his despair, the villain takes a heavy dose of a quirk empowering drug and goes beyond his limit, using his Weather Manipulation Quirk to summon a massive lightning, striking Izuku and Katsuki. The rest of the students try to apprehend Nine, but the villain easily defeats them and catches Katsuma and Mahoro up. He holds Mahoro hostage and threatens to kill her if Katsuma doesn't surrender his quirk. Katsuma runs towards Nine to save her but Nine tosses Mahoro to the side and tries to steal Katsuma’s Quirk. Before he can do it, Izuku and Katsuki enter the fray to save the children.

Izuku and Katsuki gain the advantage after Nine is reaching his limits of using his multiple Quirks and overwhelms him with a combination of Detroit Smash and Explosion. On the verge of defeat, Nine uses the entire empowering drug in his life-support system which amplifies his Weather Manipulation Quirk to the maximum and summons a massive fire tornado and Lightning Storm and begins to destroy everything on the island.

Izuku and Katsuki manages to survive his attack, but Nine proceeds to decimate them with his Bullet Laser and uses his Hydra Quirk to crush them to death.Realizing the only way to win was to share the power of One For All, Izuku transfers his powers to Katsuki. Izuku and Katsuki both use One For All at 100% and defeat Nine once and for all.

Miraculously, Nine managed to survive that attack, being blasted away to a field surrounded by flowers. Using a Warping Quirk, Tomura Shigaraki appears in front of the beaten Nine and confront him. Nine says he needs more time. He reaches out saying that he hasn't perfected the society yet, and there needs to be someone who can guide everyone. Shigaraki puts his hand on Nine's face and says that leader will be him. Then he kills Nine with his Decay Quirk and leaves the island.