|“||Work hard and be sure to smile. Afterall, without joy and laughter to balance the sorrow. This world can never hope to have a bright future.||„|
|~ Sir Nighteye's last words before his death.|
Mirai Sasaki, also known as Sir Nighteye, 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 renowned for being one of the most astute people in the world until his death after the raid on the Shie Hassaikai.
Mirai Sasaki was a pro hero who was once All Might's sidekick, though the two have since parted ways. Despite being quite strict and serious, he greatly valued laughter and humor. His Quirk, "Foresight", granted him vision of a person's entire future.
Mirai had a bad habit of being very rude to those who fall even a little under his expectations and is generally overly stern. He was particularly nasty to Midoriya, due in part to his lack of humor, but mainly because he thought Midoriya was severely inadequate compared to Mirio, and thus believes that Mirio should have gotten One For All instead. However, on his last hours, he recognized he was a victim of his own conceptions. He acknowledged Midoriya as someone who is worthy as a hero and capable of anything and is relieved that Midoriya forced the future to follow his will. As for Mirio, Nighteye comforted him by touching his hand to his student's face and admitting Mirio had become more to him than just the next vessel for One For All and was his favorite pupil. He resents that it was his own fault the future wouldn't change because he didn't have any faith that it would, and it took the combined willpower of everyone involved in Eri's rescue to power a change in the future. He dies requesting all those that he is leaving behind to stay hopeful, because that is what it will take to bring the world into a better tomorrow.