-Fanfic Idea Start-
Kaito Sato is a pretty calm and normally detached boy.
For years, he had never managed to figure out clearly what his quirk was.
The scans and doctors all indicated the existence of one - But no matter what he tried, nothing worked.
That is... Until clues to what his Quirk truly was began to pile up.
Back when he was 7.
It all started when a Hero that Kaito was a decent fan of died in a brutal Villain Attack. All Might arrived too late to the scene.
As he sat on the couch and saw the news, a frown formed on his face.
It was then, that the normally uncaring and reserved boy had the thought, 'Ah, that's pretty sad... He was pretty cool.'
A ping in his mind caught his attention, an emotionless and almost robotic voice echoed out to him in his mind.
[Kaito Sato Gained Strength From The Fallen!]
At that, Kaito felt a slight increase in his strength.
That was Kaito's first clue.
And many more followed...
Eventually naming and diagnosing exactly what Kaito's quirk is.
Quirk - Supreme Overlord.
Kaito gains permanent strength from the Death of those he has a positive emotional attachment, regardless of how weak the attachment is.
The weaker the positive emotional attachment, the less strength Kaito gains.
The opposite is also true, the stronger the attachment is, the more strength Kaito gains.
Should the emotional bond or attachment constitute a negative emotion like disdain, Kaito gains nothing - Much like those he doesn't care about.
For such a powerful quirk...
It's a shame that Kaito rarely gives much of a fuck about other people, even in his current teenage years.
...Hero work does pay a pretty sum though.
-Fanfic Idea End-
Look, this came up to me when I saw those Kingambit memes.
So his ability as a Quirk in Boku No Hero Academia!
Honestly pulled this outta my ass.
I adjusted the ability to make sense not in a "Pokemon" sense.
Now it works based on emotions, very "Human" stuff.
As it would be too broken given the fact that he gained strength from every damn thing that dies.
So with these adjustments, and an MC that rarely gives much of a fuck with an ability that requires positive emotional attachement - You get this semi-functional plot thing.
Also, this gives ya a good excuse to do a JJK and kill off lots of Characters.
i mean... How is Bakugo still alive in the Manga?
Not hating on him, but gawd damn.
How good of an idea is this?
I don't know lol