This is my second attempt at removing as I personally don't think Hidan has any business being on the category.
Hidan's actions aren't unique and are somewhat shared with Kakuzu. Hidan and Kakuzu together defeat Yugito, kill a bunch of mooks in a temple, torture and kill Asuma, and try to kill Shikamaru. Both of the former two Hidan did with Kakuzu's assistance.
Naruto has a very, very high heinous standard with nearly every major villain having uber large bodycounts. Pain kills a whole country worth of people, Tobi/Obito starts a world war that kills thousands of people, Kabuto commits mass necromancy forcing the dead to fight their loved ones to the death, Orochimaru performs fatal experiments on babies.
The resource argument also doesn't work as villains with just as much power, if not less have really large bodycounts. Zabuza as a kid slaughtered about a hundred kids, Sasori is a Serial Killer who converts his victims bodies into puppets, etc. Torture also isn't at all unique. Itachi tortures people, Orochimaru tortures people, Gato tortures people, Danzo tortures people.
Hidan is also kind of comedic. Some of his lines and his reaction to Asuma slicing his head off is comedy gold.