Japanese Voice Actor: Miyuki Sawashiro
Human Partner: Hiro
Type: Ceratopsian (Little horned dinosaur)
Attribute: Virus
Gammamon appeared in the first episode. Hiro was given the digital watch from his father. He was, also, told to take care of his little brother, Gammamon.
Gammamon loves chocolate, which he calls "my champion".
Betelgammamon
Kausgammamon
Gulusgammamon
Wezengammamon
Canoweissmon
Siriusmon