Shinra

Shinra is head of the Oni Clan As a child, he envied Taira his brother and used that as a motivation to get stronger, but he always loved and respected his brother. He got into some altercation with an ayakashi and his brother saved him, but it ended up costing him powers and was forced into live as a human in the human world. He met you a long time ago when you were a child. He had gone to the human world to practice his summoning of thunder in order to surpass Taira at something. Unbeknownst to him, you were in that field crying and scared and so he made up that charm on your palm to calm you. Because of their reputation, oni aren't used to gratitude but you thanked him and he never forgot that. Although you didn't know it was Shinra at the time, he was your first crush. Sweet, blushes all the time, tsundere, teaser, jokester, friendly, childish sometimes, loves you and only you, and loyal to you.