When All-Might shows up for his first day of teaching, he finds journalists camped out around UA calling out to ask why he's chosen to take up teaching and whether this will affect his Pro Hero work.
All-Might himself opts to take up a teaching job at UA shortly after the series begins, partially because he realises that his secret injuries are slowly catching up to him and he wants to pass on his ideals on to the next generation. However, many heroes eschew that life, with several top Pro Heroes like Midnight and Eraserhead preferring to teach at UA. Top Heroes like All-Might, Endeavor and Sir-Nighteye can afford skyscraper headquarters and employ dozens if not hundreds of employees, even before taking into account their sidekick heroes.
But even though many less-skilled mediums have used their talents to gain fame and money (such as Izuna and Mugenkai Jiku), Nube works as a simple elementary school teacher due to his love for his students.
Gokusen: Kumiko "Yankumi" Yamaguchi is a high school math teacher who handles a class full of delinquents.During his spare time, he solves cases as detailed in his own story, Lord El-Melloi II Case Files. Despite his mediocre magecraft, he's reputed to be a great teacher who also cares for his students. So, Waver is known as "Lord El-Melloi II" and becomes the Lord of the Department of Modern Magecraft Theory where he is also a professor. After Kayneth died during the fourth Holy Grail War, Waver Velvet is adopted into El-Melloi family because the heir is too young to inherit the title.Initially, he was supposed to Rider-class, Iskander, but Waver stole it out of retaliation after being humiliated in class. In Fate/Zero, he also participates in the fourth Holy Grail War where he is the Master of Lancer-class Diarmuid Ua Duibane. He is also a lecturer in the Department of Spiritual Evocation where Waver Velvet is one of his students. Kayneth El-Melloi Archibald is a renowned mage of the Mages' Association and the Lord of the Department of Mineralogy of the Clock Tower.In Blue Exorcist, Mephisto Pheles is the headmaster of a school training exorcists.and also an incredibly high-ranking demon himself.While he could easily kill all the students with little effort, and they're all gunning for a bounty on his head, he proves to be an excellent teacher to them all, forming a general kinship and helping them improve themselves.
Until then though, he's decided he wants to work as a high school teacher, teaching his class not just standard materials, but also assassination skills. Assassination Classroom: The mascot of the series is Korosensei, a bizarre hyperintelligent octopus-like creature who has threatened to destroy the world.