Ah, I have to agree with Exe when she stated on how it isn't generally 'copying' your character if only the appearance alone looked similar and the name was the same. There's been many times when individuals would decide to use my name, however it certainly erked my nerves, though it isn't generally copying my character. Though, if the person was using the same Bio information as you, plus the similar appearance and same name, then that would certainly be considered copyright. However, this isn't the case.
I understand your anger on the matter, and I will gladly keep my eyes out for anyone named 'Dorian'. If I am to come across the user, then I will send you the screenshots of em' via PM. Though, what it sounds like to me is little floofs seeing your fursona as something awesome and has decided to use your overall character Biography, Name, and Appearance to make something quite similar to it, but edited with a few tweaks to fit their own personal opinion. I wouldn't let it get to you much, for some individuals can just be that way. However, it's good that you posted this as an alert, for like I said, I'll keep my eye out for em'.