I forget if I already replied to this or not, but here ya go...
Kanto: Misty and Sabrina. Misty's a real cutie, and Sabrina, if I recall correctly, is a psychic prodigy and uses one of my top 5 favorite types.
Johto: Morty (Only by playing PKMN Stadium 2 recently did I realize his name pun, lol). He's quite dire from what I perceive, and he also uses one of my top 5 favorite types.
Sinnoh: Maylene. She seems rather easy-going, and has serious potential. Plus, earliest Lucario in-game outside of cheating/trading FTW.