Ainz Ooal Gown

Ainz Ooal Gown (アインズ・ウール・ゴウン, Ainzu Ūru Goun) is one of the main characters of Isekai Quartet. He is the leader of the Great Tomb of Nazarack. Whenever his favorite MMO YGGDRASIL shut down, he found himself stuck in a world similar to the game, making him the isekai character in his universe.

Trivia

 * He reveals that he is from another world to Tanya after discovering they are in a similar situation.
 * Aqua is able to deduce he is from earth as she sent people to other world before.