Wouldn't Grass be more appropriate for the Tanooki?
Mabye for names somthing playing on the word Fuego?
It's true grass would be more appropriate but it's too obvious. So I applaud Poketto on his originality.
I think you've fully mastered the G/S/C style, as for the starters. The only two problems I have is the lineart of the water starter's first evolution. I think it could be more round and smooth near the bottom of the tail like how it curves too instantly which makes it look quite messy and uneven. The second problem I have is the fin, it just seems too large and out of place. What you could do is make the fin smaller or change the placement of the backfin so you could see it.
Edit:
What I noticed about the first evolution of the Fire Tanuki is that it looks just like a regular Tanuki. So I recommend adding something onto it to make it look more of a fire type.