Lore theory #1: The reason why Pou/Bou is trying to murder you is because you wouldn't listen when he was trying to explain Poulina. Lore theory #2: The more pale the more evil. Extra to theory #1: If Pou/Bou kills you, he says " YOU ARE MINE" , and to me, that means " YOU ONLY NEED ONE". By "ONE", I think he means " one Pou. That is just my opinion!!