patamon
Patamon is a main character in Digimon Adventure and Digimon Adventure 02, as well as the movies Digimon Adventure (The movie), Our War Game!, The Golden Digimentals and Diaboromon Strikes Back. Patamon can be seen as one of the most important Digimon throughout the first season, because without him Devimon would never have been defeated and Myotismon would have killed Kari and Piedmon would have won the final battle.Patamon is the playful Digimon partner of T.K.. In Digimon Adventure, Patamon was the last of the Digi-Destined Digimon to achieve his Champion form, and the last again to achieve his Ultimate form.
T.K. returns as a main character in the second Digimon Adventure 02 season, as does Patamon. Because of the Digimon Emperor's control spires, Patamon was no longer able to Digivolve into his Champion form, and instead fought in his Armor form - Pegasusmon.
In the series, Patamon has a childish, sensitive personality. Patamon is a small cute orange flying guinea pig like creature with light blue eyes and bat-like wings, which could possibly be his ears. This mammal digimon has also been considered to look like a mouse or pig with wings.
Source from here.