Leod the Bully? I have Seasons, which creates the neighborhood Riverblossom Hills. Leod, one of the characters that comes with the neighborhood (playable) runs randomly into the game while I am playing other families and beats up people...including his own child. Why?
It's hard to say maybe he's just got a mean streak in him. Personally I think I would arrange a little swimming pool accident for him.
i'll admit I've never come across a bully in game before because if i see them i either change them using 'boolprop' or i'll use death by flies which seems to get rid of any problems.