These are some pretty good ideas, however I think there are some better choices for their teams.

Belle- Litwick (Lumiere), Roserade (The Rose), Zoroark (Beast)
Alice- Azumarill (The White Rabbit), Liepard (Cheshire Cat), Caterpie (Blue Caterpillar)
Tiana- Feraligatr (Louis the Alligator), Volbeat (Ray the Firefly), Politoed (Need I say more?)
Ariel- Wingull (Scuttle), Kingler (Sebastian), Goldeen (Flounder)
Jessica- She's fine as she is
Jasmine- Chatot (Iago), Aipom (Abu), Arcanine (Raja)

And here's a few suggestions for future teams

Mulan- Charizard (Mushu), Kricketot (Mulan's Cricket, Cri-Kee), Rapidash (Mulan's Horse, Kahn)
Nala- Luxray (Simba), Pignite (Pumbaa), Watchog (Timon)
Aurora- Noctowl (The Owl), Murkrow (Maleficent's Crow), Hydreigon (Maleficent)
Rapunzel- Kecleon (Pascal), Zebstrika (Maximus the Horse) Piloswine (Her Long Hair)