In the English version, he is voiced by Steve Blum.
In the Japanese version, he is voiced by Masako Nozawa.
Guilmon resembles a small red dinosaur/dragon creature with the ears of bat's wings. He has a white belly with the Digital Hazard symbol on his belly, has three sets of claws and black markings on his arms and feet.
Guilmon is very playful and mischievous and sometimes scares people. Sometimes, when Guilmon gets into trouble, he worries Takato. Despite those, he is very loyal to Takato. At times, Guilmon calls Takato "Takatomon".
Guilmon was created by Takato by using a sketch. While Takato went down for dinner, Guilmon's sketch was scanned into Takato's Digivice and started to come to life. Takato found where Guilmon is about to be born. Guilmon then came to life. At first Takato was afraid that his creation was about to attack him, but Guilmon became friendly and the two were instantly best friends.
- "Guilmon Digivole To..."
- "Guilmon Biomerge To..."
- He shares same English Voice Actor with Mitsuo Yamaki and Kenta Kitagawa.
- His English Voice Actor Steve Blum, best known voicing as Flamedramon, Raidramon, Magnamon, Poromon, BlackWarGreymon from Digimon Adventure 02, J.P. Shibayama from Digimon Frontier and Falcomon from Digimon Data Squad.
- He is the first Virus Digimon main protagonist.