Daizen was a fat man with short, black hair who walked with a waddling gait and had a round face. He wore a metal white and red KoB uniform> and, according to Kirito, it would be impossible to find a person less suited to wear it. Daizen is said to speak with a sort of heavy accent.
Daizen is a very profit-minded individual who would turn any event, like Kirito's duel with Heathcliff, into a money-making financial gain to the guild.
On October 20, 2024, Daizen organized the duel on the 75th Floor between Kirito and Heathcliff in Collinia. Charging admission to the Colosseum, he was seen selling tickets to over a thousand spectators that came for the event, earning the Knights of the Blood a significant profit.
Daizen was logged out after Kirito defeated Heathcliff, prematurely clearing the game.