Fusion Fighters

Xros Heart is the protagonists' 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. He often wields the Rare Star Sword.

Digimon Xros Wars (anime)
The Xros Heart army is made up of Digimon from many Zones, who all share the desire to free the Digital World from the Bagura Army, and restore the peace it once had. The founding member of the army is Shoutmon, Taiki's official partner, who wants to become the Digimon King in order to protect his friends. Several of his friends from the Green Zone, Ballistamon, the Starmons, Dondokomon, and Jijimon, decide to join Shoutmon on his quest.

Later on, in the Island Zone, ChibiKamemon also decides to join Xros Heart after he helps them save his friends from Neptunmon.

After being slain in an attempt to break Xros Heart out of a Bagura Army prison in the Magma Zone, Dorulumon's old comrade BlueMeramon asks Dorulumon to join Taiki on his quest to stop the Bagura Army. Having come to terms with his past, Dorulumon decides to finally join Xros Heart, and Cutemon of course joins with him.

When Xros Heart comes to the Lake Zone, they soon find the distraught PawnChessmons, whose leader Knightmon has been trapped in a frozen lake and is near death. Taiki rescues Knightmon, and even helps the knights' princess, Persiamon, defend her castle from the invading Bagura Army. In thanks, Persiamon, Knightmon, and the other PawnChessmons join Xros Heart as well.

In the Sand Zone, Xros Heart is saved from Blastmon and his army of SkullScorpiomon by the timely intervention of Deputymon. He asks them to help him find the Code Crown, and at one point asks them to fight Pharoahmon, but Taiki realizes that Deputymon and Pharaohmon are testing him, and refuses to continue fighting, earning him the Code Crown. This encourages Deputymon to join Xros Heart as well. Baalmon soon shows up to help Blastmon, who is trying to fight off the Blue Flare and Twilight armies, and attacks Xros Heart. Baalmon and Taiki get trapped in underground ruins by a quake caused by Blastmon, and after being blessed by a strange statue of a goddess, Taiki learns that Baalmon was once part of a sect of warriors for that goddess, and that the sect was destroyed when its members were brainwashed by someone in the Bagura Army. Taiki befriends Baalmon, but once they emerge from the ruins, they find that the rest of Xros Heart has been brainwashed by that same Digimon, who turns out to be Ebemon acting under Lilithmon's orders. Baalmon manages to free the Xros Heart Digimon from Ebemon's control, and together they are even able to destroy him, but Lilithmon fatally wounds Baalmon before he can claim vengeance on her. Pharaohmon appears and reveals that Taiki can use the Code Crown to begin a ritual that can revive Baalmon, but Lilithmon summons her pet Machinedramon and orders him and the army of SkullScorpiomon to attack Xros Heart. The Xros Heart Digimon bravely attempt to fend off Lilithmon's forces, but when Baalmon awakens and sees that Xros Heart is about to die to save him, he forces Taiki to end the ritual and go help his friends. As Taiki rushes off and tries to fight Machinedramon, Baalmon dies; however, just as Machinedramon (as HiMugendramon) is about to claim victory, Baalmon is reincarnated as Beelzemon, and with his help, Xros Heart is able to defeat Lilithmon and HiMugendramon. In gratitude, Beelzemon joins Xros Heart.

Digimon Xros Wars (manga)

 * Lillymon
 * Sunflowmon
 * Mushroomon
 * OchiMusyamon

Shoutmon + Star Sword
Shoutmon + Star Sword is simply Shoutmon wielding the Star Sword. This is counted as a DigiXros, as it gives Shoutmon an unexpected increase in power.

Shoutmon takes this form against Armed MadLeomon and defeats him in one blow.

Attacks
 * Star Blade: Charges the Star Sword with flaming energy and then releases a cutting shockwave of fire.

Digimon Slingshot
The silver Pickmons, on their own, can DigiXros into an elastic slingshot.

Starmon and the Pickmons take this form to help Shoutmon take down Pteramon.

Shoutmon X2
Shoutmon X2 is the Digi-Xros form of Shoutmon and Ballistamon.

Shoutmon X2 first appears when MadLeomon (Orochi Mode) attacks the kids as they made their way out of the Village of Smiles, and Taiki learns that Shoutmon does not wish to be the Digimon King for himself but for his village. He attempts to attack MadLeomon, but Taiki fakes MadLeomon out with a bungee maneuver, which opens him up for Shoutmon X2 to fire a blast and defeat MadLeomon.

When Xros Heart arrives at the Island Zone, Shoutmon and Ballistamon digiXros into Shoutmon X2 in order to fight off a Baguara Army platoon of Gizamon. This time, the Starmons also digiXros into the Star Axe, which Shoutmon X2 wields. Later on, the Digimon again separately digiXros into Shoutmon X2 and the Star Axe to fight the Bagura Army's Octomon. However, they are unable to breathe underwater until ChibiKamemon comes and digiXroses with Shoutmon X2 to form Shoutmon X2 Plus.

Attacks
 * Mac Arrow
 * Horn Breaker DX
 * Buddy Blaster: Fires a small but powerful orb of blue energy from its chest cannon.
 * Arm Bunker: Charges energy into its arm.
 * Optic Laser: Shoots a large laser beam from its eyes.
 * Miya Vulcan

Rare Star Sword
The Rare Star Sword is a DigiXros of Starmon, three silver Pickmons, and the red Pickmon. The silver Pickmons form the blade of the sword, while the red Pickmon forms the tip and empowers the weapon with an aura of flames. Zenjirou often uses this form of the Starmons in order to assist Xros Heart in attacking.

Zenjirou uses this sword to destroy Drimogemon. He later uses the sword again while ambushing one of Neptunmon's fleets.

He also uses it to try to help dig an escape tunnel

Attacks
 * Kōtō Slash (江東スラッシュ): Throws the Rare Star Sword like an arrow.
 * Kōtō Kiri (江東斬り): Performs a slice with the Rare Star Sword.
 * Shinonome Ittougiri (東雲一刀斬り): Performs a decisive strike with the Rare Star Sword.

Shoutmon X3
Shoutmon X3 is the Digi-Xros form of Shoutmon, Ballistamon, and Dorulumon.

An incomplete Shoutmon X3 (missing Dorulumon as its legs) fights Armed MadLeomon and takes out his chainsaw before reverting back to Shoutmon and Ballistamon.

Attacks
 * Victorize Boomerang
 * Three Victorize

Star Axe
Starmon and seven of the white Pickmons can DigiXros into a golden axe.

Starmon and the Pickmons take this form to help Shoutmon X2 take down Octomon. It is used many times in the Island Zone.

Shoutmon X2 Plus M
Shoutmon X2 Plus M is a DigiXros of Shoutmon X2 and ChibiKamemon, wielding the Star Axe. ChibiKamemon becomes a shell for Shoutmon X2's back. Like a turtle, Shoutmon X2 can retreat into the shell to avoid an attack, and can also breathe underwater.

Attacks
 * Buddy Blaster: Fires a small but powerful orb of blue energy from its chest cannon.

Star Sword
The Star Sword is a DigiXros of Starmon and the silver Pickmons. Whenever it is created, it is part of another DigiXros.

Shoutmon X4
Shoutmon X4 is the Digi-Xros form of Shoutmon, Ballistamon, Dorulumon and the Star Sword, which is made out of Starmon and Pickmons. He is essentially Shoutmon X3 wielding the Star Sword.

Shoutmon X4 appears in Taiki's dream of Xros Heart, where Shoutmon X4 mows down the opposition. When Dorulumon shows up, his appearance causes Taiki to remember the dream.

Attacks
 * Three Victorize
 * Three Victorize Max Power
 * Burning Star Crusher

Shoutmon + Dorulu Cannon
Dorulu Cannon is the "Hougeki Keitai" (砲撃形態) of Dorulumon. This is the Digi-Xros form of Shoutmon and Dorulumon.

Shoutmon X4K
Shoutmon X4K is the Digi-Xros form of Shoutmon, Ballistamon, Dorulumon, the Star Sword, Knightmon, and the PawnChessmon (White). In this form, Shoutmon X4 gains a cape with Knightmon's emblem and a shield with the Xros Heart emblem, and the Star Sword is enhanced to resemble Knightmon's sword. Furthermore, the drills on its tail and legs change into spikes, resembling the ones the PawnChessmon have on their helmets.

Attacks
 * Burning Star Crusher

Shoutmon X4B
Shoutmon X4B is the DigiXros of Shoutmon, Ballistamon, Dorulumon, the Star Sword, and Beelzemon. He is the "Shinme Keitai" (神馬形態), formed when Beelzemon granted further power to the "Victory Keitai" (ヴィクトリー形態), Shoutmon X4. The powers of each of his techniques have increased exponentially.

When battling GuardiAngemon, Shoutmon X4 gets severely beaten. Beelzemon appears and stops the battle, saying that he doesn't like it when people use power to control others and tells Taiki to DigiXros him so their speed would match GuardiAngemon's. Taiki does so and forms the centaur-like Shoutmon X4B, who easily defeats him but Taiki stops him before Shoutmon X4B could kill GuardiAngemon

Attacks
 * Star's Blade Celestrike: Destroys the opponent with a hail of bullets, while at the same time cutting them right in half.
 * Chaos Flare: Fires a powerful shot from the Berenjena SDX, in a version of Beelzemon's "Death the Cannon" that has been empowered to the point that it can pierce through mountain ranges.

Shoutmon X5
Shoutmon X5 is the DigiXros of Shoutmon, Ballistamon, Dorulumon, the Star Sword, and Sparrowmon.

Attacks
 * Meteor Buster Attack
 * Meteor Impact: Punches the opponent with its burning right fist.
 * Burning Star Crusher
 * Three Victorize
 * Impact Laser: Fires a giant, vortex-shaped laser at the opponent.

"Dorulumon + Starmons"
"Dorulumon + Starmons" is a DigiXros between Dorulumon and the Starmons, where the Starmons arrange themselves into helicopter blades and attach to Dorulumon's tail. It has not been officially named.

"Beelzemon + Starmons"
"Beelzemon + Starmons" is a DigiXros between Beelzemon and the Starmons, where Starmon combines with Beelzemon's Berenjena SDX, giving it the power to fire a barrage that can destroy an entire army of opponents. It has not been officially named.

Attacks
 * Meteor Cannon

Ballistamon Mush Cottage
Ballistamon Mush Cottage is the Digi-Xros form of Ballistamon and the Mushroomon from the Green Zone in the manga. It houses Xros Heart for the night, where its, with its Mushroomon chef, feeds the team dinner. Unfortunately, they are ambushed by Tactimon, and the Digi-Xros is broken.

Attacks
 * Mush Full Course: Cooks and serves a wide variety of mushroom-themed dishes.

Ballistamon Sextet Launcher
Ballistamon Sextet Launcher is the Digi-Xros form of Ballistamon and Dorulumon.

Attacks
 * Sextet Storm (嵐の六重奏「シケステッド・ストーム」): Unleashes its ordinance of six cannons.