Misty by far. She wasn't afraid to say what she thought, she was (and still is) a powerful trainer. When the show began she was still a rookie, but by the AG she became a Gym Leader, none of the other cast members have done that (in fact Brock has done the reverse). Also, she displayed the most dynamic personality, she was either loving and caring or she was an angry beast. Her pokemon had dynamic personalities as well (Psyduck, Corsola, Togepi, and Politoed being the most so). I felt the writers did her an injustice. After watching her 4 episodes in Chronicles I feel she needed to get her own spinoff (Misty as Gym Leader would be fun to watch w/ Butch and Cassidy as the Team Rocket agents).