茅場晶彦
The main antagonist in the Aincrad arc of the [[Sword Art Online]] series, he is the development director and Game Master of the Sword Art Online fictional game as well as the designer of the [[NerveGear]].

[spoiler]He uses the [[Heathcliff (sao)|]] in-game avatar during the Aincrad arc, and has a supporting role during the Fairy Dance and Alicization arcs.[/spoiler]
kayaba akihiko