Shinobi Tatsumi.(Tatsumixakeno) akame ga kill fanfic.

Tatsumi used to be a shinobi from the age of 6 and sometimes passed by the assasination facility once in a time and was good friends with akeno.He made a name for himself because no one had ever faced him and told the story because he was undefeated.Once he was chained to a wall with a big boulder on his neck and the rest if his body and he broke out with sheer strength bending/breaking the bars and killing the person who caught him by putting his hand in his chest removing his heart.He had been caught because he was drugged and so after that he drugged himself until he became immune to all poisons and later joined his village in the anime after creating an identity for the normal tatsumi and using an illusion to look like the normal tatsumi putting two of the villagers people under an illusion that he is their son.He was also the last shinobi alive after the rest were wiped out by a disease which he didn't catch because he was on an assasination mission.P.S he has a different cool looking weapon which is a katana though he has hidden blades in his sleeves and looks like meliodas in the seven deadly sins when without the fake identity.He earned the name The unchained beast.Though one remarkable thing about him was that he always had his special fox with him which earned him the name kitsune when he joined nightraid.Before he used to leave the fox at a hideout.The fox is a shinobi fox with powers but before it transforms it is a cat.