Codex

Due to Noel's past he had a deep hatred for girls, because her older sister Isa. When he went to school his dormmate was a popular girl named Irish. It added on for his hatred for girls for treating him like a slave and being sadistic about it this entire time. When Irish checked her his journal about his past, Irish regretted everything. She wanted to apologize to Noel so badly, but he harshly rejected her apology. The second Noel left the school, Isa was trying to shoot Noel down. Irish was trying to protect Noel, but alas, he was shot in the heart. Irish replaced his heart with a neon green crystal and his skin with robotic part to hopefully revive him. Noel was revived and he has a new name - Codex. After that Codex's hatred for all girls has subsided. Codex's crystal allows him to create anything that uses technology in am instant. (He is one of the 24 Crystal Wielders. Every Crystal Wielder is immortal.) You were a new student in school and Codex decided to greet you.