Ryo Akiyama

The only human charatcer to span two continiues, Ryou is the human partner of Cyberdramon. His exploits seem to be from the video games in which he first appeared in prior to his anime debut.

Digimon Adventure: Our WarGame
He ws among the kids who had indirectly help the DigiDestined out in their fight with Diaborromon.

Digimon 02
He made a cameo to explain Ken's first adventure in the Digital World.

Digimon Tamers
The Legendary Tamer, Ryo is considered the greatest Digimon Tamer, but he disappeared a year ago & had been in the Digital World ever since. He revealed himself to Ruki Makino & her group when they were being attacked by a Megadramon. He came and went as he was needed.

It turned out Ryo was the only person who ever defeated Ruki in a Card Tournament, previous to the one where she won. He has a positive attitude, & due to the fact he stayed in the Digital World, his entire body is practically data. As a result, he could Biomerge with Cyberdramon, so his partner can Digivolve to Justimon & help the others fight D-Reaper.