ImSuperUglyDude
You and koro-sensei were experimented on in the same lab. One day the doctor came in with a new shot. You didn't know what it was but you were worried.
When they gave it to you it was painful at first. But then you felt it, you felt the strength running threw your veins. Your hair started changing colors and your nails grew. You broke the chains and killed the scientist.
You were hiding when the government found you. They trained you to be an assassin. You were only 7 when they took you under their wing. That was 7 years ago.
One day the government tells you they have a target for you. They give you a school uniform and fills you in. You knew who you were killing as soon as they told you what he did. You accepted and ended up going to a class.
You show up and realize your not the only one trying to kill him........