Mirai Sasaki

Age: 38

Birthday: January 2

Height: 200 cm (6'7")

Quirk: Foresight

Sir Nighteye is a Pro Hero and Mirio Toogata's mentor. He is also a former Sidekick and the brains of All Might. Sir Nighteye is famous for being one of the smartest people in the world.

[Spoiler] Later, in the 4th season, he dies because of a major injury attained during a fight. [/Spoiler]

(Source: Boku no Hero Academia Wikia)