Dorulumon (Fusion)

Description
Dorulumon is one of the main characters in Digimon Xros Wars, an unoffical member of Taiki's team, Xros Heart. While Dorulumon is first introduced in the second episode, he doesn't make a major appearance until the next when he Xros Digivolves with Shoutmon and Ballistamon to form Shoutmon X3. Although he leaves shortly after beating MadLeomon, Dorulumon ends up helping Team Xros Heart again at both the Island and Magma Zones. Though offered a place in the group, Dorulumon turns down the offer because he used to be a member of the Bagura Army. It is revealed by Tactimon that while Dorulumon served under the Bagura Army, he helped destroy and enslave countless Zones as Tactimon's right-hand man.

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

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

An incomplete Shoutmon X3 fights Armed MadLeomon and takes out his chainsaw before reverting back to Shoutmon and Ballistamon.

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 his Xros Heart against the Blue Flare, where Shoutmon X4 mows down the opposition.