But ... slowly but surely, as you are able to hand more escalating situations and come out on top your character begins to harden, have more resiliency, courage, self-esteem, confidence, believes in himself, his mechanical abilities also improves. He is able to consistently aim better, sprint faster, have more self-control, more knowledge of weapon handling, etc. This could also have a negative effect because if the returning character has already been through so much and has all that experience, the new game has to reflect that mechanically, and the game would probably not be as scary since the protagonist can handle himself so it has to be kept at a moderate level. This is also why there is so much female protagonist in the horror genre.