"Those without hearts." -Leon describing The Heartless
Heartless are living creatures manifested from the darkness in peoples hearts. They go around collecting hearts coming in many forms and types of Heartless. They're weakness is the Keyblade, which Sora, Riku, Kairi, Jeffrey, Nathan, Mitsuki, Xion, Aqua, and King Mickey Mouse wield. Maleficent and other villains controlled the Heartless for their evil gains.
- Jaden will first fight the Heartless in The Jaden Sora Power Hour.
- The Heartless will appear in Jeffrey, Jaden & Friends' Storm Adventures of Scooby Doo 2: Monsters Unleashed.
- The Heartless will appear again in Jeffrey, Jaden & Friends play Jumanji.
- Several Heartless guest star in Jeffrey, Jaden & Friends' Storm Adventures of Goosebumps.