Sai Yukitsugu

Itsuki (イツキ) is an original Sword Art Online game character and one of the main characters in Sword Art Online: Fatal Bullet. He is one of the most famous and top skilled players in Gun Gale Online (GGO) and is the leader of the Squadron "Alphard". While he is seemingly a calm and carefree player, Itsuki is secretly on a constant search for something to excite him. This obsession leads him to become the main antagonist of Fatal Bullet.

Gun Gale Online
Itsuki has a red and narrow eyed avatar with dark grey hair. His outfit prominently features black and white, a light blue on the inside of the arms of his long tailed coat, with red seams overall. He carries gun shells on the side and back of his coat. His canon choice of weaponry is a Dragonfall that resembles a real life Dragunov Sniper Rifle as his primary and a Sirius Optical Sub-Machine Gun as his secondary.

Personality
Itsuki is a mysterious character who is never willing to share anything regarding his real personality. Instead of being an open character, he enjoys providing various bits of information about himself, before promptly following up by claiming that he was joking, thus even his Squadron members do not know much about him. Aside from this, he is a skilled leader and a genius player when it comes to laying decoys and traps in GGO.

Towards the end of Fatal Bullet, Itsuki opened up to the Protagonist first, confessing to the boredom he feels, as well as revealing that the only thing in the world that had sparked his heart was them. In the final chapter of the game, he admitted that he had desperately longed for the Protagonist's utmost friendship, to the extent that he did not care for anything that could pose a threat to that, going as far as creating a devious plan that could kill himself, the Protagonist, Kureha, and Zeliska.