Biyomon is a small pink bird with blue-tipped feathers on her head and a ring on one of her legs. At the tip of her wings are three pink claws. She is the partner to Sora Takenouchi.
Biyomon first appears in her In-Training form, Yokomon. She first Digivolves to her rookie form when the DigiDestined were attacked by Kuwagamon. Biyomon later Digivolves into Birdramon, and then with Sora's Crest of Love, into Garudamon.
Biyomon also appears in the sequal season Digimon Adventure 02. In this season, Biyomon had lost the power to Digivolve into Garudamon. When the Digimon Emperor was conquering the Digital World, Biyomon was among the old generation Digimon who helped the new Digi-Destined team out. Like many of the first generation Digi-Destined, she became the protector of a certain area in the Digital World. Biyomon later appears in the real world in Christmas Day as a "present" for the original Digi-Destined organized by Davis and the other newer Digi-Destined. With the power from Azulongmon's Digi-Cores, she gains the ability to Digivolve to ultimate again.
Biyomon Digivolved into Birdramon for the first time to defend the Yokomon Village from a Meramon who was controlled by a Black Gear.
Garudamon, her ultimate level, debuted when Myotismon made himself known to the DigiDestined. Biyomon, weakened from DemiDevimon's dart, was determined to protect Sora. Sora's refusal to allow her to fight made her realize that she did know what love was and that she felt it for Biyomon and her mom. When Birdramon was hit by Myotismon's Crimson Lightning Attack, Sora ran towards her shouting, "Birdramon, No, I love you!" This caused her crest to glow and Birdramon was able to digivolve to Garudamon, who managed to stop Myotismon and allowed the other Digi-Destined to escape.
When Sora used the crest power to free the Digimon Sovereigns, Biyomon lost the power to become Garudamon until three years later, when Azulongmon gave one of his DigiCores to the Digi-Destined Digimon. This allowed them to Digivolve to their ultimate forms again. Garudamon appeared this time in Moscow to help the Russian DigiDestined fight against a swarm of Flymon and a stampede of Mammothmon.
In Dimensions, Biyomon accompanied Sora to the tamer's universe in Book Three to protect the world against the Demon Lords' arrival. In the battle with Barbamon, she gained the ability to Biomerge with Sora to form the mega form, Phoenixmon. They continue to be valuable assets to the tamers while living at the File Apartment with the older generation of Digidestined and their partners.
- Spiral Twister (Magical Fire): Biyomon flaps her wings and creates a green flame, which is shot out as a spiraling inferno.