Joe Chill

Joe Chill is a small time crook who had the most servre affect on Batman, because he is the man responsible for killing Batman's parent, however he regrets his decsion because every other Batman Villain hates his guts and wanted to kill him, because his act is the reason why The Dark Knight exist in the first place, causing trouble for them and their goals for Gotham, he has no friends on either side in this case.