[quote=Gowi]
Incorrect given the creators gave firebender's lightning, lol. I mean lightning is a common everyday example of a thing created from plasma itself. So by Avatar laws, raw plasma would be high tier firebending. This is why I make lightning a completely separate element in my custom roleplays where elemental benders are a thing.
[/quote]

I don't think you understand why plasma wouldn't be for firebenders. Plasma is a state of matter formed when gas is ionized. Electricity, like fire, is the expenditure of energy. For fire, there is a combustion/ignition of something that continues to feed off of a supply of energy to fuel the process. Lightning is just that raw energy, that is normally from two points that have a third ground point that it can project to. Plasma is not this. Plasma is literally ionized gasses. Air benders essentially bend gasses.