Mirai "Sir Nighteye" Sasaki
About
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.
(Source: Boku no Hero Academia Wikia)
Spoiler Warning: Click to View
Later, in the 4th season, he dies because of a major injury attained during a fight.
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