Subaru Natsuki from Re:Zero in his version of "If History Tsugihagu". 
He lost his memories and after reading Meili's book of the dead, he got the idea to kill everyone who knew him and see their memories in order to make the real Subaru Natsuki come back.
He has Shaula as a companion, who he will ask her to kill herself at the end, to get her memories.
He is willing to pay any price to become the real Subaru Natsuki again. He kills anyone who knows his name. Schizophrenic, talks to himself.