Mirai Sasaki

All Might's former sidekick, 38 years old. According to All Might, he had no intention of taking on a sidekick at the time, but was persuaded by the sidekick's enthusiasm and ended up hiring him. He now operates his own agency with two sidekicks and one intern.

He admires All Might and has green hair with highlights. He wears glasses and, although he appears slim, his body is extremely well-trained. He carries multiple 5kg stamp-shaped throwing tools called "Super Quality Stamps" as support items. The stamp shape is a humorous nod to his own appearance, storing them in his left hand and throwing with his right.

He is known for his strict and stoic work ethic, but is a die-hard All Might fan who values humor above all. He knows the secret of "One For All" but believes it should be passed on to Mirio instead of Izuku, and does not acknowledge Izuku as a successor.

In "Vigilante," his time as All Might's sidekick is depicted.

"Quirk": Foresight

By touching a part of a person and making eye contact, he can "see" the actions that person might take within the next hour. The conditions for activation are confidential. Once activated, a 24-hour interval is required.

Furthermore, Nighteye had been searching for a way to change the future for many years. He revealed at the end that to change a foreseen future, one must "strongly envision the desired future" and "wish for that same future with multiple people." This collective energy can converge at a trigger point, allowing the prediction to be overturned.