Gomamon first appeared when he digivolved from Pukamon to protect Jou from Kuwagamon in episode one of Digimon Adventure. He is Jou Kido partner and has the ability to digivolve into seal-type forms with water-based attacks. Gomamon has a laid-back and easygoing personality, where he often attempts to convince Jou to overcome his fears and socialize instead of studying.

Gomamon can evolve into Ikkakumon (Champion), Zudomon (Ultimate) and Vikemon (Mega).