Kingdom of Knuffel

You're light, because obviously donuts are good

I would actually call your avatar Air right now. Something about it seems very fairy-like to me (something about the colors and the arboreal background maybe) and fairies are air-elements in my mind, so....

You make me think of gargoyles and stone, so earth!

Difficult but I'll go with air

Earth.

You don't look like it but you're darkness

Definitely an earth/nature element.

you're earth

You're definitely air

I think you're earth