 Laughing Jack is one of the most famous Creepypasta characters.  He only kills children (mostly the ones who are alone, so have no friends) He is nice to you at the beginning to get them on his side, then he starts to put the child in danger.  He gives them sweets that he makes himself that have drugs in them.  After staying with the child for a certain amount of time, he kills it at night when it is sleeping.  He fills the corpse with sweets.