He is a Oni ruler that was sealed away by the Demon Slayers of ancient times and is one of the three most powerful Ayakashi in Japan. After he was freed, he swore vengeance against the human race. Though he is not complete, as he is with fragmented power, his plan is to use Tama to regain power for her as well as for himself. He finds humans in modern times weak and pathetic. He appears as a well-dressed young man, but he is a very powerful demon that is agile and fast enough to sense the presence of incoming attacks.

(Source: Wikipedia)