Cyberdramon is an Ultimate Level Digimon, and is the partner of Ryo Akiyama. Feral in personality, his mission is to annihilate any Virus-type Digimon that have invaded the network. However, Cyberdramon is a lone soldier not affiliated with the "Virus Busters" group. His partner, Ryo, has been shown to use a unique whip generated from his D-Ark to restrain him if he gets out of control.

When three Digimon fans -- Rika, Henry, and our lead Takato -- suddenly find themselves with "real" Digimon, they discover a living creature under your care is far harder to deal with than a few pixels on your TV screen. The kids try to be Digimon 'Tamers,' aka Digimon caretakers, but they all seem to have different opinions on what that should entail. Rika thinks Digimon should fight, Henry thinks they should never fight, and Takato ... seems to be somewhere in the middle. 
Being a Tamer isn't just about believing one thing or another. It's about learning and adjusting for the good of everyone else. But they have a long way to go, and their problems are just beginning. 
(Source: Toykoypop)

Keisuke Amazawa goes to the DigiMarket, where he remembers how he got his partners, Betamon, Tentomon, and Gotsumon. Not happy, he challenges the owners of the market and has to fight against their Triceramon, Tyrannomon, and Monochromon. 
(Source: Digimon Wiki)

Takato Matsuda, Ruki Matsuno, and Lee Jenrya are children who have, by fate, received real Digimon, unlike the imaginary ones in the card game they play. Each of the children, or "Digimon Tamers", have their different views on how Digimon should be treated. But when other Digimon begin to appear around Japan, they must put aside their differences to fend off the digital intruders; even though Yamaki, who is the head of a secret organization called Hypnos is trying to eliminate all of the Digimon himself.
 
(Source: Anime News Network)