Like what PrettyReckless said, it is kind of aggravating. A lot of times I'll see people have their character with names that just so happen to be the names of characters from other games/shows/books/whatever, and anyone who recognizes the name will complain about how they don't look like the actual character.
A while ago, I was on and my friend had her character named Ciel (she named her character that because it means sky/heaven in French, she wasn't stealing the name). Everyone thought that she was trying to be Ciel from the anime Black Butler, and harassed her about how she didn't look anything like him, even after she said multiple times that she didn't base her character off of him.
So yes, it does get pretty annoying.
This bothers me quite a bit when it comes to the canon character name thing. I once had a character named Squirtle, and I didn't know anything about Pokemon, I just randomly thought of the name and thought it was cute. I kept getting whispers about how "you look nothing like a squirtle", despite explaining that I wasn't a Squirtle from Pokemon, but eventually I had to change the name to Turtle (which I still get a lot of whispers and such about, but luckily it's never hurtful or anything. I agree that people shouldn't be so quick to judge a character if they share the name of some other character---they may have been inspired, never heard of that character, etc. The same goes for people who get angry if some character happens to share their character's name (not including if someone has gone out of their way to copy that person to hurt them in some way, but just if they happen to have that same name.)
As for the natural/unnatural colored wolves thing, I can see why. There are wolf packs, lions prides, etc. that just want to keep their roleplay realistic, and unnatural colors just don't fit in. Of course, its another thing if they are rude to the player and say things like, "You're stupid and your character is stupid because its not realistic" or "im better than you because my character is realistic", that's a whole other thing. There's nothing wrong with unnaturally colored characters, but if a group doesn't allow characters like that and aren't rude about it, then I don't think anything is wrong.