We have to remember also that he is hundreds of years old. While he is a 17 year old in appearance he is technically an old man. His body is not aging but his mind is more mature. I hope this is established well through the writing and how PP carries himself and speaks. He cannot be as old as they are making him and immature, it wouldn’t work out.
I do agree that he is going to be very sadistic and do not know if the scar is PP or Hook. Remember we only saw the first time Hook met Felix; we do not know if they had encounters the hundred or so years Hook was in NL. I mean could Felix have tried to stop him from taking Bae with him?