
He is defeated by Kirito at the end of Volume 1 and, at the end of Volume 4, leaves behind a program that grants Kirito the World Seed. Although he has the admin powers to make his avatar immortal, he is shown to be a powerful player even without his in-game immortality due to his intimate understanding of the SAO game mechanics which he himself had designed. Later, it is discovered that he has been masquerading as Heathcliff, the leader of the Knights of the Blood Oath. Any in-game death or attempt at removal of the Nerve Gear would result in the real life death of the user.

He traps all the players within Sword Art Online by using the Nerve Gear to cease sending signals to the users' body. Heathcliff (ヒースクリフ Hīsukurifu) / Akihiko Kayaba (茅場 晶彦 Kayaba Akihiko)Īkihiko Kayaba is the Director and creator of the Nerve Gear and Sword Art Online, as well as the main antagonist of the Sword Art Online arc. The cafe later becomes Kazuto and company's meeting place in the real world. Agil runs a shop named "Dicey Cafe" in the real world, which was ran by his wife during his two-year coma.

Kirito is a regular in his shop and they are friends. Despite his intimidating appearance, he is kind-hearted and spent most of his earnings to help players in the middle floors.

Agil is 180 cm tall with a muscular build. He regularly meets with Kirito and his friends and occasionally joins them in quests in ALO, especially after the release of the World Seed.Īgil (エギル Egiru) / Andrew Gilbert Mills (アンドリュー・ギルバート・ミルズ Andoryū Girubāto Miruzu) A bald axe wielder who owns a shop in SAO. Klein uses a katana to fight and later becomes a leader of his own guild. They go their separate ways shortly after when Kirito leaves for another town to power level, while Klein remains behind to help out his less experienced friends. Klein (クライン Kurain) Ryōtarō Tsuboi (壷井 遼太郎 Tsuboi Ryōtarō) A friendly player that meets Kirito at the start of the game, who quickly befriends and learns from Kirito.
