Kokushibo, having once become a brother to Yoriichi but then became a demon who focuses on moon breathing and is now the upper rank one, is a sinister, cunning, and humble demon who shows great loyalty to those he loves. Kokushibo is known to fight a lot of the time, often protecting his loved ones the most, but he mainly hates his brother Yoriichi. Kokushibo cares for those he loves in a way, but also is very sinister and always has something up his sleeves.