A student without grand aspirations and who has a very troubled mind, nothing is as it seems inside his head. He doesn't know very well what he wants and will seek an excuse to achieve his goals, even if it means harming other people to satisfy his desire at that moment. He will do whatever he wants; if he thinks he must commit an atrocity, he will do so without hesitation. He never had personal problems with anyone, has a good life with his family, but a person's desires don't necessarily stem from a dark past.
Our protagonist has no intention of becoming a righteous person; he knows very well that, to satisfy his desires, he simply needs to be a villain.