Nine was a man of reasonable height with fair skin and thin, rectangular gray eyes with white pupils. He also had white hair that reaches just past his shoulders, worn swept back away from his face.
His most defining feature was the large black mask that covers him from his chest to just above his nose, four extra pieces winding around the exposed skin of his face and around his head. Four darker plates cover each side of his neck, lined with dark purple, and he had what appears to be something similar to the flat muzzle of a gas mask over his mouth that’s decorated with seven gray studs, as well as a large purple and black cylinder protruding from each of his shoulder blades. Below this, he wore a full-body suit of a similar design, with plates of black covering his entire body, leaving only his fingers exposed, and, over this, a blazer and dress pants of a pale lilac color.
In the past, Nine wore black shoes, black pants, and a tattered white jacket.
Nine possessed a very calm and apathetic demeanor, usually showing little to no emotion regardless of the situation. He also had a great deal of composure, as seen by his refusal to attack anyone unless provoked, as well as using his Quirks exclusively in a defensive manner. If pushed enough, however, he was prone to violent fits of rage. He would also completely abandon any restraint in those moments, demonstrated by him attempting to choke Mahoro to death in order to force Katsuma into getting his Quirk taken. Nine was also very humble, and especially valued those who demonstrated impressive strength, be it ally or enemy.
Nine believed that a truly superhuman society should be one where the supremacy of one's Quirk is the only way of measuring a person's worth and that both heroes and villains are irrelevant. With the ideal that raw power is the only thing that matters, Nine was prepared to undergo whatever experimentation was necessary to increase his own power.
Overall Abilities: Due to having multiple Quirks, Nine was an extremely powerful villain, being able to contend with and overpower many of Class 1-A's top students. However, due to the toll of his Quirk, he was unable to fight prolonged battles. He was also able to overpower people like Izuku and Kastuki time and time again.
- Enhanced Durability: Possibly because of inheriting All for One, Nine possessed very impressive durability. He managed to survive a direct hit to the face from Izuku's smash with no visible damage and was able to continue fighting against Izuku and Katsuki despite the immense pain his body was under. Even after being hit point-blank by Katsuki's explosion enhanced by One for All, he managed to survive, although he was on the brink of death.
Weather Manipulation (気象操作 Kishō Sōsa?): Nine's initial Quirk allowed him to control the weather; allowing him to summon destructive thunderstorms in an instant and even create a powerful tornado with himself at the epicenter. However, according to Nine, his Quirk was too powerful for him to wield and it resulted in the destruction of his body's cellular tissue.
All For One (オール・フォー・ワン Ōru Fō Wan?): Nine's second Quirk allowed him to steal other peoples Quirks and use them as his own. He was able to steal as many as eight Quirks. Whether he could transfer any of these Quirks to someone else is unknown. Nine received this weaker version of All For One after he proved to be compatible with All For One's Quirk factor. However, receiving this Quirk appeared to have worsened the side-effects of his original Quirk and exhausted him much more quickly.
- Unnamed Scan Quirk: Nine could see what Quirks other people have and measure their level of power.
- Unnamed Barrier Quirk: Nine could create multiple layers of transparent barriers made of air to shield himself in a particular direction at a time. He could also create a single spherical barrier to protect himself from all directions. These barriers can withstand powerful attacks such as Izuku's Delaware Smash Air Force and One For All at 100%
- Unnamed Laser Quirk: Nine was able to fire purple-colored lasers from his fingernails. These lasers can easily pierce through flesh.
- Unnamed Wind Quirk: Nine was able to fire off powerful gusts of pressurized air. It seems to stun the opponent as shown when Izuku could not move when he was hit by it.
- Unnamed Water Dragon Quirk: Nine could summon large blue dragon-shaped attacks that he can control at will. He generally summons two at a time but can summon multiple more if he requires it.
- Cell Activation: This Quirk allowed Nine to activate the cells in his own body or another person's body, boosting regeneration and repairing the damage. However, it only works on individuals of a certain blood type. Nine stole this Quirk from Katsuma Shimano's father, but it was in vain due to the villain's blood type being incompatible.
Life-Support Tubes: Nine had tubes on his back that released a drug-like substance that healed him slightly after overusing his abilities. It also boosted his offensive power.
- It is unknown if he is nameless or has a full name.