Deltamon

Deltamon is a Composition Digimon whose name and design are derived from "Δ", a Greek letter shaped like a triangle. It was fused from three Digimon, and although each of them had existed as separate Digimon, due to a computer running wild after it was struck by a storm's electromagnetic waves, they were forced to fuse by a computer bug. It is said that since this Digimon, which possesses three heads and two tails, specializes in tripartite attacks that capitalize on its body's traits, it is even able to fight against three Digimon as if they were one. However, because all of them were brutal Digimon, they are only of one mind on destruction, and are usually on bad terms with no spirit of cooperation.

Digimon Adventure 02
In the Digital World's "Death Valley" (Land of No Return in dub) where the latest Control Spire was, the sand sucked in Yolei Inoue, Hawkmon, Cody Hida, Armadillomon, Takeru "T.K." Takaishi, Patamon, Hikari "Kari" Kamiya and Gatomon in, leaving Davis Motomiya and Veemon untouched. When encountering the Digimon Emperor, Davis' friends were suspended from the ground over a Deltamon under the control of the Digimon Emperor's Dark Ring. When the Digimon Emperor asked Davis which of his friends he will have spared from Deltamon's triple appetite, Davis offered himself in their place, despite the Emperor's mocking reply that he would not satisfy Deltamon's hunger. Suddenly, Digmon appeared with the rest of the Armor Digimon (Halsemon, Pegasusmon and Nefertimon) and the Real DigiDestined. The fake ones were really Bakemon and they attacked. Davis was mad about being tricked and Armor Digivolved Veemon to Flamedramon. When the Digimon Emperor was attacked by Davis, the Digimon Emperor ordered Deltamon to destroy him before Flamedramon destroyed the Dark Ring.

Digimon Adventure V-Tamer 01
DarkTyrannomon and Deltamon were followers of Lord Triceramon and guarded the entrance to the valley where the 1st V-Tamer Tag was. Tai and Zeromaru were able to bring them down.

Digimon World 2
Deltamon digivolves from Gizamon, and can digivolve further into Megadramon or Gigadramon depending on its DP.

Digimon World 3
Deltamon can be found in Amaterasu Server's Tyranno Valley. It is also the first Digimon the Qing Long City Chief has. It is also available as a Brown Champion Card with 14/14. In the PAL version of the game, Deltamon can be found in Amaterasu's East Sector, in East Wire Forest.

Attacks 
 * Triple Force (Triplex Force): Fuses and fires energy discharged from its three mouths.
 * Serpent Bite (Skull Fang): Lunges with the Digimon on its left arm.