Ever since I first watched the 5th Pokémon movie, Bianca a.k.a. Kanon, has been my favorite character ever. The main reason is because she's one of the few that is almost just like me--she draws a lot like I do, and our personalities are very similiar. XD Plus, several people (even my mom) have said that she resembles me... as closely as an anime character can, anyway. Minus the hairstyle.
For other characters, I've always liked Misty a lot, as well as Hikari, and May. Molly (Mi) from the 3rd movie was also really adorable, so of course she also turned out to be one of my favorites! Whitney, the Gym Leader, was also funny, so... I dunno. I have a lot of other favorite characters. X3