haku (utawarerumono)

Haku is an amnesiac man found by Kuon. This encounter will eventually lead him to bond with a certain mercenary named Ukon (actually Oshutoru, Imperial Guard of the Right, in disguise) as well as start living in the Imperial Capital of Yamato, where he works as the Secret Agent of the aforementioned Oshutoru and uncovers a conspiracy against the Mikado of Yamato, his long lost brother who somehow significantly extended his lifespan. He is a true human who was sleeping in stasis since shortly before Iceman's wrath and somehow didn't become a Tatari.

At the end of Itsuwari no Kamen, he is forced to take Oshutoru's identity after his death and must lead a rebellion to restore Anju (the Mikado's daughter and heiress) as Yamato's Mikado. At the end of his journey, Haku will find the true instigator of the conspiracy and become the new host of Wistalnemetia.

He is the protagonist of Itsuwari no Kamen and Futari no Hakuoro (in disguise as Oshutoru).