Yamata has tanned skin, short thick eyebrows and black hair tied in a spiky ponytail. He wears a silver and blue DDA uniform, a metal chestplate, silver earrings and a grey cape. His arms are bandaged.
On December 24, 2023, Yamata and the Divine Dragon Alliance followed Klein and the Fuurinkazan, who were following Kirito, to the Forest of Wandering, the spawn point of Nicholas The Renegade. While Kirito went of to fight the Flag Mob, the Divine Dragon Alliance made a deal with the Fuurinkazan to have a duel between Klein and a member of the alliance to decide which party would have to go back. As Klein was victorious, the Alliance's members had left by the time Kirito returned from his battle.
Yamata was among the Divine Dragon Alliance members participating in the Boss Fight of the 75th Floor against The Skull Reaper and was logged out of the game after Kirito killed Heathcliff, prematurely clearing the game.