American Dragon: Jake Long season 3

Having returned from Hong Kong, Jake and Rose are together again. Though there is a mystery concerning the whereabouts of Rose's twin sister, which relates to a new enemy, Crom Crowe. And Jake has to solve the mystery in this third and final season.

Characters:

 * Jake Long (Dante Basco)
 * Lao Shi (Keone Young)
 * Fu Dog (John DiMaggio)
 * Arthur P. "Spud" Spudinski (Charlie Finn)
 * Trixie Carter (Kittie)
 * Rose (Mae Whitman)
 * Haley Long (Amy Bruckner)
 * Jonathan Long (Jeff Bennett)
 * Susan Long (Lauren Tom)
 * Sun Park (Sandra Oh)

Villains:

 * Crom Crowe (Lance Henrikson) - the main antagonist, A mythical creature from the Irish Mythology freed by Jake's bumbling Professor during his trip in Ireland, his goal is to take revenge on the Dragons who imprisoned him long ago. He appears in the 5 episode arc relating to Rose's twin sister's whereabouts
 * Dark Dragon (Clancy Brown) - imprisoned in the same world as Crowe was, and reveals that it's not just one but millions of Dark Dragons.
 * Eli Pandarus (Jonathan Freeman)
 * Darius King (Giancarlo Eposito) - a Human who hunts mystical creatures so he can get rich.

Friends:

 * Olivia (Olivia Hack) - a Dragon who Jake befriends, her Dragon form is Black and Green Dragon with a White streak in her wings
 * Thorn (Mae Whitman) - Rose's twin sister, she has a 5-episode arc relating to her whereabouts

Magical Creatures:

 * Unicorns
 * Dragons
 * Fairies
 * Gwilligy - a mystical hound from Fu Dog's past

Others:

 * King Arthur (Jason Issacs)
 * Andre and Gina Mallik (Bill Fagerbakke and Bridgette Bako) - Rose's parents, they don't realize they have another daughter