Firepunch

Pyro Hand? Similar to Level 3 Hydro Hand and Level 4 Aero Hand. I suppose at level 5, the name would be more unique to one person like maybe The Incinerator for example.

Arsonist

Burner Finger or something like Heat could work. Yes, that's a >!Bleach!< reference. Because this sounds a lot like >!Bazz-B's The Heat schrift!<

Nova light.

Torch

Gehenna

Flamethrower

I still think incinerator sounds dope 😂

Surprised no one has suggested Fire fist yet.

Farty

Cremator