Koboshi the Chaos Spirit
It's a Lampent!
(Ghost Lamp/Lantern pokemon)
I rather like how this turned out.
Lampent's a bit creepy though.
"It visits dying people and absorbs their soul as soon as it leaves the body. "
But I think a well trained one won't do this..
Microsoft (MS) Paint
On that note if how they move is any indication it seems the metal arms really bend, going on this I went with the theory it's moving its arm in a different way then normal. I hope you don't mind.