Misty, Kanto and Orange Islands only.
I loved her back then, she was fiery, hot tempered, but still showcased her obvious crush on Ash. What I liked most about her is that she was confident, not only with herself but with her Pokemon abilities, sure sometimes Psyduck would pop out of its ball uncessarily, but when she battled she proved she was a capable trainer (Her gym battle with Ash, her battle with Marina, her battle with James etc). I think after Togepi hatched she became a little more reserved, but by the time she hit Johto, she became basically like a mother. Such a switch from her old persona, IMO Brock should have gotten Togepi, while Misty could have kept her old personality. Johto Misty was one of my least favorites.
Other than that, I LOVE Jesse, Gary was great (until getting his personality changed, like Misty) I also enjoy Brock sometimes too.