Monodramon

Monodramon is a Digimon, the Rookie form of Cyberdramon. Unlike Cyberdramon, Monodramon is quite curious and slightly playful, which can lead him into trouble sometimes.

Digimon Tamers
Cyberdramon De-Digivolved to Monodramon when he boarded the Arc. He remained that way until he and Ryo Biomerged to Justimon.

V-Tamer
Ryo and Monodramon ended up in the V-Tamer continuity where they teamed up with Taichi Yagami and Zeromaru and engaged in battle against Vikemon.

Brave Tamer
Monodramon was chosen to be Ryo's patner. Then went on a series of adventures together, but had to travel to Milleniumon's place to defeat him. It was there that Milleniumon revealed that he (Milleniumon) was always Ryo's true partner. In the end Monodramon had to force a DNA Digivalution between himself and Milleniumon.