Mirai Sasaki

Sir Nighteye was a tall (200 cm), lean, muscular man with sharp and elongated features. His shiny hair was always worn, smoothed down, and parted to his left, and was dark green, with three yellow streaks towards the front, two on his right and one on his left. His eyebrows were also yellowish, matching the rims of the triangular glasses he wore and the strikingly bright yellow irises of his stern-looking eyes. His looks gave off a sense of authority and power, as he rarely smiled and looked stern, and he always appeared to be glaring.

Unusually for a Pro Hero, Nighteye appeared to prefer plain office clothes (a plain white suit with gold buttons, a white dress shirt, and a red tie with white dots) instead of an elaborate hero costume. His clothes, however, were quite durable, as he used them during battles, and they didn't show any sign of damage or tearing.

Sir Nighteye maintained a stoic and intimidating presence with a cold and sharp glare, but that was only the side of his personality he showed in public. Even with his supposedly fierce stare, Nighteye greatly valued humor and required people to make him laugh before he acknowledged them. Nighteye believed that humor and energy were vital elements for the future of society and punished subordinates who failed to display those qualities. For example, he placed his sidekick Bubble Girl into a tickling device for failing to amuse him with a report.

Sir Nighteye claims Izuku's All Might impression is all wrong
Nighteye criticizes Izuku for his "flawed" impression of All Might.
Nighteye was a big fan of All Might, watching videos about his deeds and keeping many of his collectibles and merchandise. He was quickly able to recollect events and details of All Might's heroism from the past, and his knowledge regarding All Might even came on par with that of Izuku Midoriya's. All Might also attempted to shape Nighteye's vision of what a hero was supposed to represent: someone who instills fear in the heart of Villains through power and hope in the hearts of civilians through good humor. At the same time, Nighteye intensely cared for All Might and expressed grave concern when he would continue with his hero duties after receiving horrific injuries from his first battle with All For One. He pleaded with All Might to retire and focus on finding a successor, foreseeing that he would meet a horrible death should he continue serving as the Symbol of Peace.

Despite this, Nighteye strongly disapproved of All Might choosing a Quirkless Izuku Midoriya to be his successor and inherit One For All. He protested against this strongly, saying that there would be any number of people more suitable, and declared that Izuku could not become All Might's successor on good intentions and willpower alone, showing a far more pragmatic approach.

Mirai is 38 years old.

Mirai is male (Mirai uses he/him pronouns).

Foresight — Mirai's Quirk allowed him to see another person's future from a third person's point of view. To activate his power, Mirai first touched the intended target and made eye contact with them. This Quirk stayed active for one hour, and once activated, it required 24 hours before it could be activated again.

While his Quirk was active, Mirai could see years into a person's future. The future he saw was shown in great detail (second by second), and it had always been 100% accurate, even when he tried to change the events he had foreseen.

However, it has been shown that Quirks that alter an object's flow of time in some way, such as Eri's Rewind, can affect the accuracy of Mirai's Quirk, rendering the predicted outcomes moot and void.