He is voiced by Brianne Siddall in Digimon Adventure & Digimon: The Movie, Doug Erholtz in Digimon Adventure tri. and Brian Beacock in Digimon Data Squad in the English version.
Digimon: The Movie
Four years before the original seven children's transportation into the DigiWorld, a Digi-Egg emerged from the Kamiya's computer, and hatched into a Botamon the next morning. Kari Kamiya managed to communicate musically with the Botamon using her whistle, and it accepted them as friends. After eating a bunch of candy bars, it Digivolved into a Koromon.
Able to speak now, Koromon constantly asks questions and eventually becomes friends with Tai and Kari. The following night, however, Koromon digivolves into Big Agumon.
The Dark Masters attack the facility where he is housed, and Gennai flees with the eggs in hand. He is taken to File Island, where he hatches into Botamon who eventually digivolves into Koromon. During this time, he plays with the other Digimon as he holds the Digivice that belongs to Tai, waiting for his partner's arrival.
Koromon finally meets his partner Tai while he is unconscious from his first arrival and tries to protect him when Kuwagamon attacks them. He digivolves to his main form Agumon when Kuwagamon corners him on the face of a cliff.
Digimon Adventure tri.
Omnimon de-digivolve to Koromon and Tsunomon.
Due to the reboot, Koromon and the other DigiDestined Digimon are reverted to their In-Training forms with their memories erased.
- "I don't think so. You missed what I did as WarGreymon. I sliced you like an onion!"
- He was originally voiced by MJ Lallo in first episode of Digimon Adventure.
- His English Fourth Voice Actress, Brianne Siddall also voices Calumon from Digimon Tamers, Tommy Himi from Digimon Frontier, Keenan Crier from Digimon Data Squad.
- His English Fifth Voice Actor, Doug Erholtz also voices T.K. Takaishi from Digimon Adventure 02, Daigo Nishijima from Digimon Adventure tri..