MidnightYamaAishi
Koneko was sent to E class for her behavior, she is just like Karma. Her and Nagisa are childhood friends, and he knows what goes on behind closed doors. Koneko likes to be called by her first name, since her last name goes to her father and he would abuse her frequently. She lives to wear long sleeve cause of this and the cuts she makes on her arms
Karma met Koneko before Nagisa for their similarities. He didn't know what goes on though. Her father would abuse her for what she is, he thinks she is a monster and doesn't deserve to be in this world. Her mother died when she was 7 and her father started to abuse her a few months after their loss. She's learned how to defend herself and when the government took her at 12 yrs. she couldn't have been more grateful. The government trained her for 4 years.
She may look cute, but she is a professional assassin. Professor Bitch and Mr. Karasuma are fans of her, also know as The Grim Incubus, or Deadly Heaven. Professor Bitch clings to her every so often and instead of kissing Nagisa, she kissed Koneko since she was the one that had mentioned her and Nagisa taking notes about Koro Sensei
Koro Sensei is the best teacher she ever had. She will never forget 3-E, the End class.