Tonks and the power of * + F I R E + *

"Well ofcorse I have powers of the flame! what type of tinker would I be without a sorce to forge with!? honestly its very easy to understand that- W-when did I get them? bah! how should I know...I-I guess forever? I mean I can't remeber a time with out a bloody flame or two...eh makes sense to me now be gone!"
*Door slam*

And so Tonk's is indead assigned the element fire!
it somewhat works as Tonks is a tinker and also fits the theme of steampunk. 
I also see the fire being used as heat / something to start up mashines and be like a sorce of fuel...idk really.
As far as I know this will not effect Tonk's shapeshifting.
um as for how Tonk's feels about fire powers...well kinda indiffrent but maybe would rather having something with a bit more + Wow+  factor...yet its still cool.