He had a large, black, triangle-shaped pompadour. He had gray eyes and a menacing face. He uses a shinai as a weapon.
Triangle had the delinquents' persona. If the player got too close to him, he would shove them away. If Ayano Aishi were to attack him, he would attack her and put her in a coma. If she had a weapon out, he would assume a menacing stance, ready to fight.
He spawned by the left side of the disposal area at 7:15 AM. He disappeared at 8:30 AM and returned at 1:15 PM. He disappeared again at 1:30 PM, this time for the rest of the day.
- He was implemented in the March 2nd, 2016 Build.
- He was removed in the April 26th, 2018 Build.
- In 1980s Mode, YandereDev imagines that he is the leader of the male delinquents.