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My Hero Academia Wiki
A world without smiles and humor... has no bright future.
Sir Nighteye in "Bright Future"

Mirai Sasaki ( () () () () (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.[2]


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. 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 looks stern, and he always appeared to be glaring.[3]

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, seemed 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.[4]



Nighteye's intimidating glare.

Sir Nighteye maintained a stoic and intimidating presence, with a cold and sharp glare, but that was only the side of his personality that 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 many of his collectibles and merchandise. He was easily 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 strongly 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 his successor on good intentions and willpower alone, showing a far more pragmatic approach. This would lead to their falling out and Nighteye focusing on finding a more worthy candidate, despite All Might having made his decision.

Sir Nighteye had feared that any future he saw was set in stone.

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. Sir Nighteye also had a pronounced conscience, as he regretted taking on Mirio Togata as his protégé and only seeing him as a suitable vessel for One For All at first, expressing how Mirio grew from that and went on to become his pride and joy.

Nighteye had shown to fear 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 Raid. Moments before he passed away, Nighteye smiled and encouraged those around him to do the same, saying that a world without smiles and humor has no bright future.


Nighteye defeats a clone of Kendo Rappa.

Overall Abilities: According to All Might, Sir Nighteye did not have any impressive physical abilities and acted more of a support for his intelligence. However, he was shown to be exceptionally fast and capable of throwing heavy projectiles, particularly his Hyper-Density Seals, as well as being able to trip up very large foes. Furthermore, under his suit, he sported an impressive physique, showing that he either deliberately hid his physical prowess to catch opponents off-guard, had increased his physical prowess after his falling out with All Might, or a combination of the previous two factors.

During the Shie Hassaikai Raid, Nighteye was capable of easily tripping up a Kendo Rappa clone created by the villain Twice, and then sending the clone flying with multiple Hyper-Density Seals before sending another seal to graze Twice. Shortly after, when Joi Irinaka's presence was exposed, Nighteye incapacitated the yakuza member with a single Density Seal. In what would subsequently be his last battle, Nighteye had enough mettle to take on Overhaul, the leader of the Shie Hassaikai, who had drastically increased his power through his fusion with Shin Nemoto. Nighteye used his Density Seals against the amalgamated Overhaul, but to no avail, and employed his Foresight to help him evade the majority of the yakuza leader's onslaught, only to eventually be fatally injured by the ground spikes the villain had reassembled.

Genius Intellect: Aside from his Quirk, Nighteye's abilities laid with his own intellect. He acted as the brains for All Might during their partnership. Nighteye used his intelligence, sometimes in tandem with his Foresight, to come up with strategies to tackle situations and make sure the best outcome could be achieved. When he first met Izuku, who was attempting an All Might impression, Nighteye pointed out the discrepancies in Izuku's impersonation of the retired Symbol of Peace. In All Might's younger days, his crow's feet were 0.6 centimeters long; whereas from the Silver Age to the present, the crow's feet have become 0.8 centimeters long. Nighteye then noted how some unlicensed merchandise gets the correct wrinkles from 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.

While venturing through the Shie Hassaikai Compound, wherein Joi Irinaka separated multiple heroes and police officers from one another, Nighteye suspected something was amiss. His suspicions were proven true when the villains Twice and Himiko Toga initiated coordinated surprise attacks on the separated crime fighters. After witnessing Twice and Himiko betray Joi, Nighteye correctly deduced that the League of Villains duo were using the raiding team of heroes to take out the Shie Hassaikai. While confronting Overhaul and learning that Mirio Togata had lost his Permeation Quirk, Nighteye meticulously surmised that Hari Kurono took Eraser Head from the battlefield, and Overhaul was pressured into using one of the completed Quirk-Destroying Bullets on Mirio.

  • Teaching Ability: Sir Nighteye's Hero tutoring skills were notable, as he managed to convert the then underachieving Mirio into one of the strongest students at U.A. High School in less than a year.


Sir Nighteye using Foresight.

Foresight ( () () Yochi?): Mirai's Quirk allowed him to see another person's future from a third person's point of view. In order to activate his power, Mirai had to first touch the intended target, and then, make 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 as far as 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/or void. An example of this was when a Rewind-affected Izuku Midoriya, defied the initial prediction of him dying at the hands of Overhaul during their battle.


4/6 B
3/6 C
5/6 A
5/6 A
All Might Fanboysan
5/6 A
Mirai's stats, according to the Ultra Analysis Book


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.

Battles & Events

Battles & Events

Chapter Appearances

Shie Hassaikai Arc
122. A Season for Encounters Absent
123. Unrivaled Absent
124. Trouble Ahead!! Episode: Work Studies Debut
125. Overhaul Absent
126. Open Up, World Appears
127. Sir Nighteye and Izuku Midoriya and Mirio Togata and All Might Appears
128. Boy Meets... Appears
129. Eri Mentioned
130. Listen to the Truth Appears
131. Fighting Fate Flashback
132. The Plan Absent
133. Catch Up, Kirishima Absent
134. Let's Go, Gutsy Red Riot Appears
135. An Unpleasant Talk Appears
136. Close at Hand!! Appears
137. Restraint!! Appears
138. Go!! Appears
139. Shudder! The Underground Labyrinth Appears
140. Suneater of the Big Three Absent
141. Hassaikai: Behind the Scenes Absent
142. Shield and Shield, Spear and Shield Appears
143. Let’s Rumble, Rappa!! Absent
144. Red Riot, Part 1 Absent
145. Red Riot, Part 2 Absent
146. Temp Squad Absent
147. Twoga!! Appears
148. The Anguish of Young Twoga Appears
149. Don't Get Mad, Irinaka Appears
150. Mirio Togata Absent
151. Mirio Togata!! Absent
152. Lemillion Flashback
153. Transform! Appears
154. Unforeseen Hope Appears
155. Saviors, the Saved and a Hero's Place Appears
156. The Power of Those Saved Appears
157. Infinite 100 Percent Appears
158. Chisaki's Warped Compassion Appears
159. It's Over!! Appears
160. Expressway Absent
161. Bright Future Death
162. Suitable One Flashback
Remedial Course Arc
163. Smoldering Flames Flashback
164. Masegaki Absent
165. Win Those Kids' Hearts Flashback
166. Be Proud, License Trainees Absent
167. Number One Hero's Starting Line Mentioned
168. The Strange Tale of Aoyama Absent
U.A. School Festival Arc
169. School Festival Absent
170. With Eri Mentioned
171. Gentle and La Brava Absent
172. Prepping for the School Festival Is the Funnest Part (Part 1) Absent
173. Prepping for the School Festival Is the Funnest Part (Part 2) Absent
174. Golden Tips Imperial Absent
175. Morning, the Day Of Absent
176. Deku vs. Gentle Criminal Absent
177. At the Construction Site Absent
178. The Woman Called La Brava Absent
179. School Festival Start!! Absent
180. Unbeknownst Flashback
181. For Someone Else Absent
182. Let It Flow! School Festival! Mentioned
183. Festival All Day Long!! Absent
Endeavor Agency Arc
241. Do That Interview! Absent
242. Have a Merry Christmas! Mentioned
243. Off to Endeavor's Agency! Absent
244. Recommended Reading Absent
245. Rise to Action Absent
246. Message Absent
247. Status Report! Absent
248. One Thing at a Time Absent
249. The Hellish Todoroki Family Absent
250. Ending Absent
251. Just One Week Absent
252. The Unforgiven Absent
Paranormal Liberation War Arc
253. Shirakumo Absent
254. More of a Hero than Anyone Absent
255. Hero Hopeful Absent
256. The High, Deep Blue Sky Absent
257. Pass It Forward, to Whomever Flashback
258. Friends Absent
259. A Quiet Beginning Absent
260. Life's Work Absent
261. High-Ends Absent
262. Mirko, the No. 5 Hero Absent
263. I Wanna Be with You Guys!! Absent
264. One's Justice Absent
265. Villains and Heroes Absent
266. Happy Life Absent
267. Flames Absent
268. Scramble! Absent
269. The Three of Us Absent
270. Inheritance Absent
271. Dark Cloud Absent
272. Good Morning! Absent
273. The Thrill of Destruction Absent
274. Search Absent
275. Encounter, Part 2 Absent
276. You Cheated...! Absent
277. Who...? Absent
278. Disaster Walker Absent
279. League of Villains vs. U.A. Students Absent
280. Red Riot, Part 3 Absent
281. Plus Ultra Absent
282. Footfall of Destruction Absent
283. 75 Absent
284. Deep Blue Battle Absent
285. Katsuki Bakugo Rising Absent
286. The Ones Within Us Absent
287. Mistake Absent
288. Save Takeo!! Flashback
289. Miss Candid and Miss Shut-Away Absent
290. Dabi's Dance Absent
291. Thanks For Going Strong Absent
292. Threads of Hope Absent
293. Hero-Saturated Society Absent
294. Final Performance Absent
295. Tenacious Absent
296. Hellish Hell Absent
297. Tartarus Absent
298. Sounds of Collapse Absent
299. Like Those Tragic Tales Absent
300. The Hellish Todoroki Family, Part 2 Absent
301. The Wrong Way to Put Out a Fire, Part 1 Absent
302. The Wrong Way to Put Out a Fire, Part 2 Absent
303. Top Three Absent
304. Izuku Midoriya and Toshinori Yagi Flashback
305. Izuku Midoriya and Tomura Shigaraki Absent
306. The Final Act Begins Absent
Tartarus Escapees Arc
307. Been a While!! Absent
308. Full Power!! Absent
309. Can't Be a Child Anymore Absent
310. Masters and Pupil Absent
311. Here We Go!! Flashback
312. Hired Gun Absent
313. High-Speed Long-Range Mobile Cannon Absent
314. The Lovely Lady Nagant Absent
315. Platitudes Absent
316. Your Turn Absent
317. Scars, Blood, Filth Voice
318. Reckless Absent
319. Friend Absent
320. Deku vs. Class A Absent
321. From Class A to One For All Absent
322. Great Explosion Murder God Dynamight Absent
323. That Single Step Absent
324. A Young Woman's Declaration Absent
325. The Bonds of One For All Absent
326. Who Are You Really? Absent
327. Rest!! Absent
328. No Man Is an Island Absent

Anime Appearances

Season 3
39. Game Start Absent
40. Wild, Wild Pussycats Absent
41. Kota Absent
42. My Hero Absent
43. Drive It Home, Iron Fist!!! Absent
44. Roaring Upheaval Absent
45. What a Twist! Absent
46. From Ida to Midoriya Absent
47. All For One Absent
48. Symbol of Peace Absent
49. One For All Absent
50. End of the Beginning, Beginning of the End Absent
51. Moving into Dorms Absent
52. Create Those Ultimate Moves Absent
53. The Test Absent
54. Shiketsu High Lurking Absent
55. Class 1-A Absent
56. RUSH! Absent
57. Rescue Exercises Absent
58. Special Episode: Save the World with Love! Absent
59. What's the Big Idea? Absent
60. A Talk about Your Quirk Absent
61. Deku vs. Kacchan, Part 2 Absent
62. A Season for Encounters Absent
63. Unrivaled Debut
Season 4
64. The Scoop on U.A. Class 1-A Flashback
65. Overhaul Appears
66. Boy Meets... Appears
67. Fighting Fate Appears
68. Let's Go, Gutsy Red Riot Flashback
69. An Unpleasant Talk Appears
70. GO!! Appears
71. Suneater of the Big Three Appears
72. Red Riot Appears
73. Temp Squad Appears
74. Lemillion Appears
75. Unforeseen Hope Appears
76. Infinite 100% Appears
77. Bright Future Death
78. Smoldering Flames Flashback
79. Win Those Kids' Hearts Flashback
80. Relief for License Trainees Pictured
81. School Festival Flashback
82. Prepping for the School Festival Is the Funnest Part Absent
83. Gold Tips Imperial Absent
84. Deku vs. Gentle Criminal Absent
85. School Festival Start!! Flashback
86. Let It Flow! School Festival! Mentioned
87. Japanese Hero Billboard Chart Absent
88. His Start Absent
Season 5
89. All Hands on Deck! Class 1-A Absent
90. Vestiges Absent
91. Clash! Class A vs. Class B! Absent
92. Make It Happen, Shinso! Absent
93. Operation New Improv Moves Flashback
94. Foresight Absent
95. Match 3 Absent
96. Match 3 Conclusion Absent
97. Early Bird! Absent
98. That Which Is Inherited Flashback
99. Our Brawl Absent
100. The New Power and All For One Absent
101. Have a Merry Christmas! Mentioned
102. Off to Endeavor's Agency! Absent
103. One Thing at a Time Absent
104. Long Time No See, Selkie Absent
105. The Hellish Todoroki Family Absent
106. The Unforgiven Absent
107. More of a Hero Than Anyone Absent
108. My Villain Academia Absent
109. Revival Party Absent
110. Sad Man's Parade Absent
111. Tenko Shimura: Origin Absent
112. Tomura Shigaraki: Origin Absent
113. The High, Deep Blue Sky Flashback


  • According to Sir Nighteye's Volume 14 profile:
    • His favorite things are heroes, especially All Might.
    • He was designed after the stereotypical look of a Japanese salaryman, contrasting All Might's American looks.
  • Nighteye's surname is composed of the kanji for "help, aid" ( sa?) and "wood" ( ki?), the "々" being an iteration mark. His first name means "future" (未来 mirai?), which is a reference to his Quirk.
  • Nighteye's name and character could possibly be inspired by the DC Hero Dick Grayson, 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 owns several books about All Might. Some of them include:
    • All Might's Path, Part I and II.
    • Heart of a Hero.
    • "I Am Here".
    • All Might Photo Collection (2 copies).
    • All Might Muscles.
    • All Might's Wise Word.
  • Nighteye's requirement to have people make him laugh at least once resembles the character Kaioh from the Dragon Ball series.
    • Coincidentally, Nighteye's sidekick, Bubble Girl, has a similar name to the Dragon Ball character Bubbles, 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 Snatch. He is the fourth known hero death when counting Water Hose.
  • Nighteye's English voice actor, Brandon McInnis, is engaged to Tenya Ida's English voice actor, J. Michael Tatum.
  • Nighteye resembles Knov from the popular manga and anime Hunter x Hunter. They both also share the same Japanese voice actor, Shin-ichiro Miki.
  • In the fourth Popularity Poll, he placed 27th.


  1. 1.0 1.1 1.2 My Hero Academia: Ultra Analysis: The Official Character Guide.
  2. My Hero Academia Manga and Anime: Chapter 124 and Episode 63.
  3. My Hero Academia Manga and Anime: Chapter 126 and Episode 65.
  4. My Hero Academia Manga: Vol. 14, Omake

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