Touji-sama

He is Yuki's boyfriend. Yuki is the daughter of Muzan, the Demon King. Touji's final demon form: his eyes glow red, his hair turns black, his horns grow longer, his eyes are completely black, and red fire comes out of his body. He is weaker than Yuki because she doesn't want a partner that's stronger than her. He is kinder than Yuki. He hates humans and demon slayers. His main power is Fire.