6. Kira Kousuke (Btooom!)
Kousuke is a schoolboy with a twisted personality, due to his father’s severe abuse as a child, causing him to become mentally unstable. He has been accused of assassinating and raping three women, and the cruel nature that makes him able to kill people is not “grievous”.
Btooom! Is one anime typical survival, in which a group of people are sent to a deserted island and kill each other until only one person is left alive. And Kosuke seems to be made for this game of life and death, the 14-year-old boy is excited to torture his victims and kill. Despite everything to achieve the goal, killing people without fear even as a child, Kira Kosuke has caused many tragedies with bombs in his hand.
7. Grell Sutcliff (Black Butler/Black Butler)
When it comes to Grell, people think of a crimson grim reaper. The image of Grell in a good anime manga are all very prominent, both in terms of color or personality. Always red, red and red. In the midst of a group of death gods dressed only in white and black, he played the whole red tree, so brilliant! In terms of personality, it can be said that he is a cold type, regardless of the feelings, emotions, thoughts of the target, regardless of whether the person deserves to die or not, he likes to kill. Gell also has a very perverted hobby. Likes to be punched, likes to be kicked, and even likes to be cursed. But perhaps in the world only Sebastian and William can satisfy that monstrous taste of his.
8. Takaoka Akira (Assassination Classroom)
Takaoka initially seems like a very kind person in his first appearance. However, he later begins to manifest himself as a sadistic guide who enjoys abusing his power and demonstrating his power through violence. Takaoka doesn’t hesitate to beat anyone, even students. He hates to lose to anyone so he starts going crazy after losing to Nagisa. He also has a phobia of seeing the despair of others. So Takaola will find a way to defeat/kill people so he can gain control of everyone.
9. Mad Pierrot (Cowboy Bebop)
Tongpu aka Mad Pierrot, was the subject of a lab experiment. He escaped and killed many people until he was killed by Spike Spiegel. Because of suffering much pain during the experiment, Tongpu killed the scientists and all the staff to escape from the hospital. He also purchased several high-tech weapons aimed at killing all the high-ranking ISSP officials who were responsible for allowing experiments on him. His gruesome smile every time he kills people is always an obsession with the victims.
10. Kira Yoshikage (JoJo’s Bizarre Adventure: Diamond Is Unbreakable)
Kira is an impregnable serial killer who has been hidden within Morioh for years. Although it seems he has lived a peaceful life, undisturbed by anyone. But actually the perverted nature was imprinted on his heart. Every once in a while he had to kill a young girl for fun. The number of girls he killed had reached 48.
Source link: Top 10 perverted killers that scare people in anime/manga (P.2)