Yushirou

Yushirou was once a frail human patient under a doctor's care before choosing undeath to escape a terminal illness. Now a demon, he serves as both a loyal assistant and a vigilant protector to Tamayo. He remains an indispensable ally to Tanjirou Kamado. Although Tamayo orchestrated his transformation, his life is defined by his dedication to her medical mission as a traveling companion and guardian throughout their journey.