By "made" do you mean recorded and cut himself or actually drawn and animated himself?
Doesn't matter, though I'm sure it's the first one. Either way, it IS his avatar, so you would have to ask him before using it, no matter what Dark_SA-X thinks. Just because he didn't actually draw it doesn't mean it's not his creation. It's the same idea as people who use stocks of Link in their sigs - they didn't actually DRAW Link, but they used him.