Sora

Sora is a Twin Blade player killer who enjoys hunting players down, especially attractive female ones, and demanding their Member Addresses in exchange for their lives. He sees Tsukasa as the strongest link to the Key of the Twilight, and starts to work with BT in the quest for the item. He also helps BT and the others to contact Helba. Sora frequently tangles with Crim, who seems as powerful as himself.

In the real world, Sora's player is a boy in the 4th grade named Ryou Misaki.

[Spoiler] In the series' final episode, Sora betrays Morganna, buying Tsukasa and the others time to escape. After briefly taunting Morganna, Sora attempts to gate out, but fails. Morganna summons Skeith, the first of the 8 Phases. Skeith then performs Data Drain upon Sora, imprisoning him in his wand, and throwing Sora's player into a coma in the real world. [/Spoiler]