(Again, I know nothing about the anime or manga, so if this doesn't work, please tell me and if possible, give me an idea to make it plausible? Hope its suitable.)
Name: Kaito Odagawa
Age: 19
Class: N/a
Powers: N/a
Height: 5'7"
Weight: 154 lbs.
Appearance:
Bio: Kaito was what many would consider a troubled youth. From a young age he became overwhelmed by family issues, a mother whom was constantly drinking and gambling away the rent money, winding up on the verge of being kicked from their home many times. A few times, they were forced to find lodging elsewhere, often in homeless shelters for days at a time before managing to find a new apartment. Having to resort to stealing, Kaito began to support the household as much as his mother did, taking food, money, and possessions from anyone he could manage to succeed with. His scholastic career was anything but special, but he did manage to graduate from school, much to his own and his mother's surprise.
Shortly after, however, he became even deeper involved in crime, even working occasionally with a small group of thugs in the neighborhood. One night, coming home after a successful burglary run, he discovered his mother being attacked and killed by a man, whom had bitten her and drained her of blood. Kaito was fortunate that he was saved by another man, whom appeared to be a vampire himself. However, instead of killing him, he offered him a choice. Serve as a guardian at the Cross Academy, working to keep the day and night students apart, or, die then and there. He was a useful candidate, no doubt. Because he had no one left, he was expendable, plus, if he decided to open his mouth to anyone, who would believe a delinquent who was prone to committing crimes and likely doing drugs? Even then, he would be silenced and forgotten and no time. Seeing no other option, Kaito agreed.