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Tetsuo (テツオ,Tetsuo?) was one of the 10,000 players who were trapped in «Sword Art Online» and a member of the «Moonlit Black Cats», a small guild. He was killed along with most of his guild when a trap was triggered, calling multiple monsters and preventing the use of crystals.
Tetsuo was a mace user and the only front line attacker in his guild's formation. Besides his mace, he also used a small kite shield in his left hand. He wore a set of black armor, consisting of a chest and shoulder plates. Underneath the armour, he wore a purple tunic.
Tetsuo was a cheerful and easy going person.
When Kirito was invited into their guild, Tetsuo expressed joy with his guild mates. He was one of the people who supported the idea of hunting in a dangerous dungeon and died on June 22, 2023 in a trap in the Labyrinth on the 27th Floor along with most of the other members of the guild.
Tetsuo and the Moonlit Black Cats being reminisced by Kirito to Asuna and Yui
Tetsuo's character design for Code Register
Other than Kirito, Sachi, and Keita, who were already named in the light novel, Tetsuo was the only member of the Moonlit Black Cats to have his name mentioned in the anime, outside of the ending credits.