If you want to be on the safe side, just make sure that your accounts that share usernames with your showdown account have different passwords. If you do that, this fool of a Took can't touch you.
Remember, this guy only has your showdown stuff. He doesn't have any way to take your money, identify you personally, nor steal your identity. Showdown doesn't use your email, so your other things should be safe enough.
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I guess I'll rest for now...