Fusion Fighters

Xros Heart is the protagonist's army in Digimon Xros Wars.

Humans

 * Taiki Kudou (Kudo Taiki): The "General" of the army and protagonist of the series. Taiki is an upbeat 7th grade boy who helps anyone in need. He excels in all sports and has a charming personality that wins over humans and Digimon alike, though he has a tendency to overexert himself and pass out. His Digimon partner is Shoutmon and is given the Xros Loader to help Shoutmon Digi-Xros with other Digimon.
 * Akari Hinomoto (Hinomoto Akari): Acting as the team's peacemaker, Akari is a kind and devoted 6th grade girl, who supports Taiki no matter what.
 * Zenjirou Tsurugi (Tsurugi Zenjiro): Taiki's classmate and self-proclaimed eternal rival. He is a practitioner of kendo and hate complicating matters. He is good with mechanics and occasionally performs repairs on Ballistamon.

Digimon

 * Shoutmon: Taiki's partner who wishes to become King of the Digital World, Shoutmon is a hardworking, friendly Digimon with a strong desire to help others. He enjoys singing and wields a microphone for leisure and to help in combat. He possess the ability to combine with other Digimon through Digi-Xros:
 * Shoutmon X2: A strong fighter that is the Digi-Xros of Shoutmon and Ballistamon.
 * Shoutmon X3: The Digi-Xros of Shoutmon, Ballistamon and Dorulumon.
 * Shoutmon X4: Shoutmon X3 equipped with the Star Sword.
 * Ballistamon: A noble and taciturn warrior who resembles a robotic beetle.
 * Dorulumon: A strong wolf-like Digimon with drills on his body who dislikes being bound by rules, and an ex-member of the Bagura Army. He can transform into the Dorulu Cannon for Shoutmon's use and also forms the lower body and right shoulder of Shoutmon X3 and Shoutmon X4. He first appeared to save Akari and Cutemon from an Earth-swimming Coelamon.
 * Starmon and Pickmons: Starmon is a small, star-shaped Digimon with sunglasses who desires fame and fortune. The Pickmons are a large number of small Digimon that accompany the team. There are three different variants of Pickmons. Starmon forms the hilt of the Star Sword, while several Pickmon form the blade of the Star Sword that can be used by Shoutmon or Shoutmon X4. They can also form the Star Axe used by Shoutmon X2.
 * Cutemon: A small pink rabbit Digimon who wears headphones and a scarf.
 * Dondokomon: A small Digimon shaped like a taiko drum with drum sticks for arms.
 * Jijimon: An elderly Digimon from the Village of Smiles who accompanies Team Xros Heart as their guide.
 * ChibiKamemon: A small cyborg turtle Digimon that resembles a minature Kamemon.