My friend and I called Dr Wily "Dr Willy" while waiting for Megaman 2 to come out after seeing the Nintendo preview (Megaman 1 never came to my hometown). After I got the game and realized that he unfortunately had a much inferior name, I still continued to affectiately call him Dr Willy with friends.
Myau will always be "Maiyu" to my Brother and I and that pronounciation is the name of my large white cat.
My Brother still likes to call Guile "Gully!", because he heard someone say that bitd. "Raiyu" will always feel much more comfortable to me than hearing "Ryu". Same with "Blank-Ah" vs "Blawnkaw".
I pronounce anime as it was intended, short for "animation". Same deal with Famicom/Family Computer. I don't call the PC Engine "Peeshee Enjeen" just because that's how the Romanji turns out.