Koromon is the in-training Digimon partner of Taichi Yagami in Digimon Adventure. It first appears when Taichi and his sister Hikari witness the birth of a Botamon from a Digitama, which soon evolves into Koromon. In this form, Koromon is a small, round, pink Digimon with floppy ears, red eyes, and sharp teeth. It is named after the Japanese onomatopoeia for a rolling object. The creature has a notably big appetite and expresses gratitude toward Taichi and Hikari by hugging them, describing this gesture as a sign of friendship. Koromon is spirited and affectionate, but it is not yet capable of combat; its only known defense is blowing bubbles from its mouth to intimidate potential threats. Shortly after meeting the siblings, it digivolves into Agumon to fight a wild Kuwagamon, and thereafter Agumon becomes its primary stable form. However, Koromon remains the initial form that Taichi bonds with and occasionally appears again in later episodes. The evolution line from Koromon continues through Agumon, Greymon, MetalGreymon, and eventually WarGreymon. While in the Koromon stage, the Digimon is trusting and open, but after digivolving to Agumon it becomes more guarded and stops speaking as clearly. Despite its brief time in the spotlight, Koromon serves as the starting point of the partnership between Taichi and his Digimon, establishing the emotional foundation of their journey.