[Katsuki nods in response, and his excitement has yet to falter.]

Yeah, usually how it works is that you're born with a Quirk that either shows up from birth or manifests around the time you reach four or five years old. It's based on genetics, so you can get your mom's Quirk or your dad's, or a mix of the two. Sometimes they mutate entirely, and you get something completely unexpected. And it's rare, but there are really unlucky people who have no Quirks at all. They end up being pencil pushers.

[He'll pause to take a sip of his tea.]

I have a friend who's mom can use telekinesis. He's watched her use it all his life, but he never got it from her. So now that I have it, it's going to really piss him off!

[And, by the shit eating grin on Katsuki's face, he really enjoys the idea of that.]