Onikirimaru  

Ogre Slayer, 鬼切丸

In ancient times, a female ogre (oni) gave birth to a child that resembled a human. However, instead of possessing an ogre's horn, this child was born with a sword in his hand known as the "Onikirimaru" or Ogre Slayer. Despite appearing human-like, he is entirely ogre and believes that once all ogres have vanished from the world of humans, he will transform into a human himself. As such, he embarks on his destiny to eliminate all ogres. Even today, in Japan's mother realm, this individual continues to hunt down ogres.