Tsukasa is a male Wavemaster who was trapped in The World and was the main protagonist of .hack//SIGN.

Tsukasa was initially a cynical loner, and seemingly arrogant to the other players in The World. Tsukasa tended to avoid others as much as possible and didn't take any enjoyment in leveling up or participating in events. In fact, his sole enjoyment seemed to come from defying the Crimson Knights. As Tsukasa was slowly befriended by Mimiru, Bear, and Subaru, he began to warm up to them, eventually seeking them out, as well as being sought out by Subaru who came to him for aid when she felt lost. By the end of the series, Tsukasa reveals the kind heart he had kept hidden for so long.