"Water is the element of change"
Toga is definitely a waterbender, she changes shape/adapts like water, and she'd be a blood bender(obviously)
Nieto Monoma is such a waterbender, his quirk requires him to be able to adapt easily which is one of the most important things about being a waterbender.
Fuyumi and Natsuo are waterbenders, they both have an ice quirk and obviously had to be pretty good at adapting to things given their childhood.
I think Mirio would be a waterbender, he had to learn how to live completely differently when he lost his quirk. He's very capable of adapting to things and that makes for a great waterbender.
"Earth is the element of substance"
Kirishima and Shigaraki are pretty obviously Earth benders. Kirishima can harden his skin like a rock and shigaraki manipulates the earth with his quirk.
I think Testu⁴ is definitely an earthbender because let's face it he's basically just Kirishima, the fonts not even different they just put him in bold or italics. I also think he'd be a metal bender(for obvious reasons)
With Mina I could really see her as a waterbender or an earthbender but I think I'm gonna go with making her an earthbender also she would 100% be a lavabender
"Fire is the element of power"
Shoto and Touya two are obviously just firebenders that escaped the ATLA universe and fled to MHA
Shoto and Touya both have incredible will. Pretty sure it's cannon that the only reason Touya isn't dead is out of spite, and in order to go through everything Shoto went through and still fight that hard he'd have to have incredible will.
Katsuki Bakugo would totally be a firebender, he's definitely got the power, desire and will of a firebender + explosion quirk, that is a firebender. Also hear me out: combustion bending
Kaminari Denki is a fire bender, he's got the desire to be stronger and the will to go along with that desire. He'd definitely be a lightning bender as well, yes, mostly because of his quirk, but still.
"Air is the element of freedom"
I think Ochako would be an airbender. She is calm and open minded, she accepts people for who they truly are, regardless of their past mistakes. She loves from the bottom of her heart and that would make her a great airbender.
Shoji would be an airbender, he had to learn to live in a world that didn't accept him for who he was and even though people hated him and harmed him he chose forgiveness instead of revenge, he let his anger go, he freed himself of his past. like a true airbender. (Also he doesn't really have a lot of worldy possessions.)
Shinso - Chi blocker(taught by Aizawa)
Midoriya - Chi blocker (also he'd definitely be from the fire nation)
Hatsume - She'd be like Sokka with all of her inventions
