>>1342103i mean, there's literally no way to stop that from happening unless you want to kill your reputation by sending out cease and desist letters.
but pic related is probably the most important part. not that anyone is going to see "GurasFeetPix69" as an 'official' account or whatever, but if you start to get harassed or brigaded, and a lot of the harassers have Gura's likeness as their profile pic, you may stain their rep by painting the fanbase in a negative light. (of course, this really doesn't apply to small indies)