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 to All Might and considered the brains behind him. Hyper-Density Seals: Sir Nighteye's preferred weapon; special seals that weigh 5 kilograms (11 pounds) each. He could throw those objects with great force and accuracy. He wielded them due to a humorous perception of what kind of weapon would best suit a salaryman. A gentleman.