Complete Monster/Higurashi no Naku Koro Ni


 * The orphanage leader from past was quite a despicable bastard. He kept children in line by fear, whipping the disobedient ones while others could hear them. There's a scene where one boy accidentally spills his ink, so the leader forces the boy to eat it. It's his treatment that helped turn , since she was even forced to clean a filthy outhouse with her mouth and saw one of her friends turned into chicken feed by this guy!
 * The people working for him at the orphanage are just as bad. In the manga (and probably sound novels), which was excluded from the anime, probably due to censorship or not having enough time, they're shown to kill and abuse the children in horrifying ways.
 * Her tragic past doesn't stray Takano away from this trope. She still murders about 2,000 of her own villagers with the Hinamwizawa Syndrome and kills Rika and her friends in The Massacre Chapter. Her true line of villainy happens when she asks Satako which was green: broccoli or cauliflower. It has been implied that she herself was color blind and had no idea either and just killed Satako anyway. And then there's the argument that killing her wasn't even necessary to the plot and that she just did it for fun. It's also shown that she inserted her own boyfriend with the Syndrome and killed him and that she faked her own death in the other worlds. It's also shown that she murdered Rika's parents, because they would intervene in her plans. She also had a weird obsession with torture weapons and was implied to try to perform a live vivisection on Satako. Just to say, her Villainous Breakdown was greatly deserving.
 * Of course, this was all just mostly as a result of what Tokyo, Nomura, and the orphanage leader did to her - see above.
 * Teppei Houjo is also a Child Hater who commits child abuse in inventive and chilling ways. Not only is there evidence he raped his own niece Satako, an 11 year old, he forces her to strip naked so he can use her for a 'table' and humiliate her. He regularly uses psychological torture on her as well, and murdered Rika, another child for getting involved. Even Takano considers him to be utter scum.
 * And of course, speaking of Nomura, she was the ultimate monster of the franchise as well. Being the Manipulative Bitch she was, she tricked Takano into helping her and also helped to indirectly cause the Great Hinamizawa Disaster, all for no reason at all other than just to close up a company. And what's worse? She's a Karma Houdini.