tobi ... Cause madara was once a man for his village and clanwhich of the two,lol
lol,jack the ripper,dis is naruto baseever: jack the ripper since he was real, greatest serial killer ever, never caught
in naruto: tobi. he started this epic war
hmmmn another possible theory @ hand,but as far as i kno anythn dats nt 4 konoha is tagged bad.The extent of Tobi's power is relatively unknown,so I would have to say Madara. I say Madara despite the fact that I don't find him truly evil, he just wanted whats best for his clan. And if you wanna get down to it, Itachi was until we found out he wasn't actually a villain lol
Sorry if you saw my previous post, I misread the question haha