hm... at the age of twelve, i would say he's not felt any Real guilt before. he has felt a bit bad for stealing from younger children early on, but quickly grew out of that. survival of the fittest and all. as he gets older, there are likely a few more instances of guilt, most embarrassingly revolving around everyone's favourite rich man. but generally, he's a person who lacks in guilt, as such an emotion only serves to hold him back and hurt him.