Fairy Tail x Op male ninja reader: A dark ninja of Redemption

Long ago there was once a powerful dark guild which Y/n was apart of it. He had no family, no friends or anyone he is related. He was taken since he was a baby and trained as an ninja to kill and striking fear to all those who dares to challenge their guild. He was the most feared and most merciless person Earthland as ever seen.

That is until he start to see what he is doing. He realised the horrible things that he had done, the deaths he has cost, the lives he have ruined and the families that he had broken. He realised his actions and thus during a raid in the village, he betrayed his guild and slaughter all of them and kill his guild master.

After that he disappeared where no one will not find him but disbite that the Magic council wanted to punish him for his acts and thus he was hunted down for years. The world sees him as what he is and thus he accepted his punishment.

For years he was alone with no one to turn to and no family to be in. That is until one day he was approach by a old man who seems nice. The old man is names Makarov and he tells Y/n that anyone can be redeemed and he knows one place that he will start his redemption. A magical guild where everyone is friendly and nice, a place called......Fairy Tail.