There is only one right answer so I’ll test you mfs

Yamamoto

all i know is not rengoku bro cant even summon actual fire

This is true, BUT I do believe it creates sparks if I remember but yeah that's about it

Rengoku

Best as in favorite, or best as in power

Power

I'm not going to answer, cause I only know half of them

I didn't think that Nero counted as a "fire user", but...

All these thoughts running through my head, arm's on fire veins burning red,

Not long before I saw ypur reply, I'd just remembered when I posted this...

Frustration is getting bigger,
bang, bang, bang, pull my devil trigger

Embrace the darkness that’s within me,

No hiding in the shadows any more

When this wickedness consumes me,

Nothing can save you and there's no way out

nope

Explain

natsu ( the top left ) can beat any fire user in any universe
he can eat fire and just get more powerfull from it

Sure but can he eat a .44 in the face?

well, no

There you go. We have a winner.

but we talking about fire
not guns

He's still a fire user, he just doesn't use it as often

cheatin

Well he FIREd the bullet

non

Honhonhon loopholes go brrr

I only remember Endeavor right now so-

hange

who the hell put that child abuser endeavor in there????

He changes Cuh
And best as in power not favorite

truefair

I don't remember his name but it translates to summer I think