Reborn are creatures that are made when the Heartless and Nobody of the same person make contact.Their only master is Gellax... and Gellax's Heartless.
A List of Know Reborn
Banished One: Banished Ones are made by "mixing" a Shadow with a Dusk.
Snatcher: Snatchers are made by mixing a Neoshadow with a Dusk.
Commmander: Illusionists are made by mixing a solider with a Samurai.
Phioenix: Phioenixes are made by mixing a Behemoth with a Creeper.
Warrior: Warriors are made by mixing a Neoshadow with a Samurai.