Mirai Sasaki (佐さ々さ木き未み来らい, Sasaki Mirai?),[1] also known as Sir Nighteye (サー・ナイトアイ, Sā Naitoai?) was a Pro Hero and Mirio Togata's mentor. He was also formerly a sidekick and was considered to be the brains behind All Might. Sir Nighteye was a tall, lean-but-muscular man with rather sharp and elongated features. His shiny hair was always worn smoothed down and parted to his left, and was of a dark green color, with three yellow streaks towards the front, two on his right, and one on his left.