The Little Keybearer

Ariel: Ventus (Kingdom Hearts: Birth By Sleep)

Prince Eric: Kairi (Kingdom Hearts)

Sebastian: Twilight Sparkle and Spike (My Little Pony: Friendship is Magic)

Flounder: Tiger (An American Tail tetralogy)

Update - Extras: Stitch (Lilo & Stitch) Toon Link and Zelda (Legend of Zelda: Wind Waker), Spider-Man/Peter Parker and Mary-Jane Watson (Spider-Man), Boss Wolf (Kung Fu Panda 2; he's captain of the guard, but is also one of Ven's best friends.)

Ursula: Narissa (Enchanted) [I know Ventus is a boy and Narissa is of the opposite sex, but I want to go with this because I think that just because the character playing Ariel is a boy or girl doesn't mean the role of Ursula NEEDS to be played by a character of the same gender as "Ariel".]

Flotsam and Jetsam: Shade the Gengar, Fang the Ekans and Violet the Medicham (AKA Team Meanies)

King Triton: Anakin Skywalker/Darth Vader (Star Wars)

Extra: Padme Amidala (Star Wars)

Scuttle: Heathcliff

Max: Snarf (ThunderCats, 2011 reboot) and Angel (Lilo & Stitch, there mainly for a love interest for Stitch)

Grimsby: Lord Rodgers (The Swan Princess) and Riku (Kingdom Hearts, more as Kairi's best friend than her servant)

Update - Carlotta: Tiana (The Princess and the Frog)

Update - Chef Louie: Horst (Ratatouille)

Mersisters: Luke Skywalker, Leia Organa (both Star Wars), Harry Potter (obviously Harry Potter), Terra (Teen Titans), Danny Phantom, Jazz Fenton (Danny Phantom)

Update - Seahorse Herald: Pinkie Pie (My Little Pony: Friendship is Magic)

<span style="color:rgb(255,255,255);font-family:Verdana;font-size:11px;line-height:normal;text-align:justify;">Vanessa: Sora (Kingdom Hearts; PS, I have a little twist in mind for this. Anyone who doesn't wish to be spoiled, don't ask.) <span style="color:rgb(255,255,255);font-family:Verdana;font-size:11px;line-height:normal;text-align:justify;">Glut the Shark: Toothless (How To Train Your Dragon; he joins up with the group after the little chase.)