Mirai Sasaki

Mirai Sasaki, also known as Sir Nighteye (サー・ナイトアイ) was a Pro Hero and Mirio Togata's mentor. He was also a former Sidekick and was considered to be the brains of All Might. Sir Nighteye was famous for being one of the smartest people in the world until his death after the raid on the Shie Hassaikai.

Appearance
Sir Nighteye was a tall, lean-but-muscular man with sharp and rather 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. His eyebrows were also yellow, 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, as he rarely smiled, 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, seem to be quite durable, as he used them during battles and they didn't show any sign of damage or tearing.

Nighteye was designed with the intention of invoking the stereotypical image of a Japanese man.

Personality
Sir Nighteye maintained a stoic and intimidating presence, with a cold and sharp glare, but that was only the side he showed in public. Even with his supposedly cruel and intimidating stare, Nighteye greatly valued humor and actually 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 that failed to display those qualities.

Nighteye was a big fan of All Might, having watched videos about his deeds and keeping several of his collectibles. He was easily able to recollect events and details of All Might's heroism from the past. 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. All Might was also a big fan of Nighteye and was impacted greatly by his death.

Though he appeared to be rather cold in some situations, he was very quick to jump to the defense of his sidekicks and anyone who worked under him. He was quick and very open about when he made mistakes and defended other people who had made mistakes under his orders.

Nighteye apparently feared using his Quirk to a large extent, particularly when it involved foreseeing an individual's future death, as he formerly believed that once he saw into the future that future was set in motion and could not be changed, a mindset he changed shortly before his death when he witnessed Izuku Midoriya defying his Quirk's vision during the Shie Hassaikai Arc.

Abilities
Overall Abilities: According to All Might, Sir Nighteye does not have any impressive physical abilities and acted more of a support for his intelligence. However, he is shown to be exceptionally fast and capable of throwing heavy projectiles as well as being able to trip up very large foes. Furthermore, under his suit, he sports an impressive physique showing that either he deliberately hides his physical prowess to catch opponents off-guard, or he is simply underestimated by most, or increased his physical prowess after his falling out with All Might, and a combination of the previous two.

Genius Intellect: Aside from his Quirk, Nighteye's abilities lie with his own intellect. He acted as the brains for All Might during their partnership. Nighteye uses his intelligence, sometimes in tandem with his Foresight, to come up with strategies to tackle situations and make sure the best outcome can be achieved. When he first met Izuku who was attempting an All Might impression, Nighteye pointed out the discrepancies in Izuku's impersonation the retired Symbol of Peace. In All Might's younger days, his crow's feet were 0.6 centimeters long; whereas form the Silver Age to the present, the crow's feet have become 0.8 centimeters long. Nighteye then notes how some unlicensed merchandise get the correct wrinkles form the correct era. After his 3-minute bout with Izuku, and the latter revealed he was trying to avoid stepping on the unreleased 10th anniversary All Might poster, Nighteye realized that, despite all of Izuku's consistent rebounds off of the walls and ceiling of the internship office, the One For All inheritor was doing his best to avoid damaging all of the prevalent All Might-based merchandise.
 * Teaching Ability: Sir Nighteye's Hero tutoring skills are notable, as he managed to convert the then underachieving Mirio Togata into a powerful hero student in less than a year.

Quirk
Foresight (予知): Mirai's Quirk allows him to see another person's future from a third person's point of view. In order to activate his power, Mirai must first touch the intended target, and then, make eye contact with them. This Quirk stays active for one hour, and once activated, it requires 24 hours before it can be activated again.

The future he sees is shown in great detail (second by second) and it has always been 100% accurate. However, recent events seem to suggest that Quirks that alter time in some way can affect the accuracy of his Quirk, possibly rendering the predicted outcomes moot and/or void.

Equipment

 * Hyper-Density Seals: Sir Nighteye's preferred weapon; special seals that weigh 5 kilograms (11 pounds) each. He can throw those objects with great force and accuracy. He wields those due to a humorous perception of what kind of weapon would best suit a salaryman.

Trivia

 * Nighteye's surname is composed of the kanji for "help, aid" (佐) and "wood" (木), the "々" being an iteration mark. His first name means "future" (未来), which is a reference to his Quirk.
 * Nighteye's name and character could possibly be inspired by the DC Hero, who was the sidekick of Batman under the name Robin before parting ways with his mentor and donning his own hero name, Nightwing.
 * In addition, the color scheme of Nighteye, yellow, green, and red, may be based upon the traditional coloring of Robin's costume.
 * Nighteye's requirement to have people make him laugh at least once resembles the character from the  series.
 * Coincidentally, Nighteye's sidekick, Bubble Girl, has a similar name to the Dragon Ball character, the pet monkey of Kaioh.
 * Nighteye appears to be a fan of Preyure (a reference to the anime series Precure).
 * It is mentioned that he took care of All Might's file work before their falling out.
 * Nighteye is the second known hero to die on screen in the series after Sajin Higawara. He is the fourth when counting Water Hose.
 * Nighteye's English voice actor, Brandon McInnis, is engaged to Tenya Iida's English voice actor, J. Michael Tatum.
 * In the Fourth Popularity Poll, he placed 27th.

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