Kayaba Akihiko

is the development director and GM (Game Master) of «Sword Art Online». He is also the designer of the «NerveGear» and the «VR Seed». And is also the main antagonist in the Sword Art Online Arc

Sword Art Online
His avatar, Heathcliff (ヒースクリフ) is the leader of what is considered to be the Sword Art Online's strongest guild «Knights of the Blood». He is the owner of the «Unique Skill» «Holy Sword» and is considered to be strongest player in-game. He wields the one-handed sword and a tower shield collectively called as Liberator. He also was able to hold off the boss of the fiftieth level for ten minutes by himself, which earned him the title «Man of Legend» (伝説の男). It is also rumored in SAO that Heathcliff's health has never gone into the yellow zone. This is due to his identity being Kayaba Akihiko and being able to make himself invincible or otherwise making his character into an «Immortal Object»after his health reaches 50% or is about to surpass it.

In the manga, we first see the avatar Heathcliff in starting city with the rest of the SAO players listening to his other self talk about the new rules that made SAO into a death game. Kirito even commented on how calm Heathcliff's avatar was on the situation. (later revealed because the death game didn't apply to him) Kirito first suspected his true identity during his match against Heathcliff when Kirito sees that Heathcliff's speed exceeded the system limits. However, Kirito figures out his true identity in the seventy-fifth floor. Thanks to a miracle in the game allowing Kirito to launch one final attack after his HP ran out, Kirito manages to defeat Heathcliff and free the trapped players.

After SAO
He reappears to help Kirito defeat Noboyuki Sugou, and leave Kirito with the Seed. He also stated he tried to copy his mind onto the virtual network so as to be a fully realized being of SAO. He also said they would meet again.

Sword Art Online

 * Level: ?
 * Main Equipment:
 * ​「Liberator」 (One Handed Straight Sword and Tower Shield)
 * Skill Slots: ?
 * Equipped Skills:
 * ​Holy Sword «Unique Skill» - (1000) «Mastered»
 * One Handed Straight Sword - (1000) «Mastered»
 * Hand to Hand Combat - (1000) «Mastered»
 * Heavy Metal Equipment - (1000) «Mastered»
 * Battle Healing - (1000) «Mastered»
 * Searching - (1000) «Mastered»
 * Tracking - (1000) «Mastered»
 * Spirit Light (hate skill) - (1000) «Mastered»
 * «Immortal»