"Monodramon" (Rookie)
"Strikedramon?????" (Champion)
"Cyberdramon" (Ultimate)
"Justicemon" (Mega)
*Justicemon requires Ryo and Cyberdramon to Bio-merge (a form of DNA Digivolve)

In late 1999, Ryo is sent a digivice. He proceeds to enter the Digiworld, where he meats up with Agumon. He helps Rescue Tai and the other 01 Digidestined from Milleniumon. Then later after witnessing the battle between Omnimon (Omegamon) and Diaboromon (Diablomon) Ryo receives the first D-3. . He is summoned to the Digiworld again, but this time with Ken. They find Milleniumon still alive, and after defeating him they seal him into the dark crystal. However, upon his defeat Milleniumon releases the dark spores. One of these aims for Ryo but Ken takes it instead. Again around 2000-01, Ryo is called. This time to participate in the D-1 tournament. Ryo wins, but he has to face Moon=Milleniumon. Ryo ends up getting thrown into a time warp. He awakes in the Digiworld at its beginning and meats Monodramon. Monodramon leads Ryo to the first computer. This computer gives Ryo the power to travel between dimensions. Eventually, he faces (Zeed?) Milleniumon. He reveals that he was Ryo's original partner. After an argument between Milleniumon and Monodramon, A fusion occurs resulting in the feral Cyberdramon. With this, Ryo decides to stay in the Tamer’s dimension. In the Tamers dimension, Ryo was a legendary card player, even besting Rika (Ruki). He entered the Digiworld because Cyberdramon was too feral to keep in the real world. In episode 28 he appears with Cyberdramon to stop Megadramon. And stays with them during the next episode, slashing one of the 6 devise cards, the Kings Devise. This causes Cyberdramon to grow and he destroys Majiramon. They then have to leave the group to satisfy Cyberdramon’s thirst for blood. They eventually run into the Digiworld Guardians and Cyberdramon dedigivolves to Monodramon. They joins the other in the Ark and travels back to the real world. He then meets up with a man who seems to be his father. In episode 46 Justimon will appear.