>"Breathing massive torrents of fire that would warp gravity around it. Anyone and anything nearby is slowly pulled toward it, unable to get footing as they’re lifted in the air, like a black hole of raging fire!"
So, a star? That's sorta what a black hole of fire is. More accurately, black holes are what's left of particularly large stars that have burned out and collapsed.

Creating mini-stars would probably be a useless quirk since it'd be just too damn powerful.
"I defeated the villain!"
"You vaporized the entire city."
"Yeah, but the villain was in the city, so I'm calling it a win."
"He was just jaywalking, man."

Alright, gonna be downvoted for this, but:

Deku should start questioning things if it turns out his child can also freeze things too…