I would say that Ross is my favorite. Basically because he always gets himself into these really bad situations. Like the one in the bathroom with the leather pants. There are tons of those, and it always happens to him.
My fav. character is Chandler Bing. His sarcasm and One liners never fail to make me laugh..even if i'm hearing for the zillionth time. TOo good, man, too good
I also like phoebe. SHe is kinda freaky and weird...and veryy entertaining :D