Ok. So first of, he was originally a human, but he ended up having to take one life in order to save another: -That being his mother- (No- he did not take his mother's life) But in return he had to pay the price for it. To become a demon or a satyr -Becoming a demon made him unable to get back to the human world- They are also feared by humans- (So sads-) -Becoming a satyr meant that he could go back to the human world, but he would have to hide. (Because people in this alternate universe- Kill satyrs-) Previously speaking- His mother was still searching for him but cannot find him-(TvT) So- he ended up choosing to be- both. (Don't ask how- or why because I have not thought about it yet-) Due to his urge to travel- literally EVERYWHERE- Even if it meant that he could never see his mother again- (Cri) So that's Koshi for ya :> (Sad story but that's his life- ;-;)