No one gives me chills like Hisoka does. Tbh my first anime was naruto, the original seriies. Orochimaru freaked me out, especially when he was performing the curse ritual on Sasuke and Kakashi showed up. He was like "If we would have fought, I would have died".
But uh, Madara, Zabuza, Pein, Tsukiyama, Jason, Blackbeard, all the aliens from Gantz...