Red the Demon Cat

Red is a Dark Spawn Lord and is the chief anatagonist of All Dogs Go To Heaven 2 - a powerful demon who was aided by Carface his plan was to use the magical Horn Of Gabriel to literally pull all the dogs from Heaven and imprison them in an island prison.

To this end, he tricked Charlie into aiding him via creating magical-collars and forcing him into a deal: this climaxed in the demon managing to actually get the horn and he began to imprison the inhabitants of Heaven and growing into a monster of seemingly apocalyptic proportions, causing the sea itself to start to rise around the island in a massive whirlpool.

However, Charlie and his friends decide to fight back, resulting in a battle that ended with Charlie blowing the horn: reversing the evil spell.

Red, who had already been weakened by the battle, was ultimately dragged back to Hell.

Role in the series
Currently, Red and his demonic clone of Annabelle, Belladonna, serve as Dark Spawn Lords who have managed to escape the Banished Realms, but have not yet appeared in the Spongebob adventures series to plague Spongebob's life. Red's relationship with Carface has, on the other hand, been ripped off into Fagin and Ratigan's relationship because Scroopfan just says.