Doppo's defining characteristic is that he has no defining characteristics. Doppo is sweet but has a short fuse, especially when it comes to his frustrations with his job, where he often faces mistreatment from management, forced to work crazy overtime. He is tired, gloomy, and depressed, but he is very compassionate when it comes to those he cares about. He is willing to defend others but not himself. His best friend is Hifumi Izanami, and they've been by each other's sides for almost 20 years.