Dragon Ball Online did a lot of this stuff - Toryiama actually wrote the plot outline for it, it was set several hundred years in the future, featuring ancient Piccolo and Master Roshi still being around and stuff like that, and Dende, but otherwise all new people besides occasional exceptions for the time-travel heavy main plot - but gameplay wise it was very much the typical MMO.
Dragon Ball Online did a lot of this stuff - Toryiama actually wrote the plot outline for it, it was set several hundred years in the future, featuring ancient Piccolo and Master Roshi still being around and stuff like that, and Dende, but otherwise all new people besides occasional exceptions for the time-travel heavy main plot - but gameplay wise it was very much the typical MMO.