(pov:Tanjiro Kamado infected with Muzan's blood.)

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Behind the myriad of facades he displays, and completely offsetting his insatiable ego and lust for perfection, Muzan is secretly cowardly. He always seeks to avoid conflict whenever possible, and his refusal to confront an unpleasant situation was most evident in his encounter with Giyu Tomioka and Tanjiro Kamado.

During his second encounter with Muzan Kibutsuji, he injures his right eye in the Infinity Castle. As the battle progresses, Tanjiro suddenly collapses, and his wound begins to form a large mass over his right eye due to the poison inflicted on him by Muzan. Later on, when Tanjiro wakes up, he is described as looking 'repulsive' by Muzan. Later in the battle, Tanjiro's left arm is severed by Muzan.After he neutralizes Tamayo's human-conversion drug and emerges from his flesh cocoon, Muzan's hair grows in length and turns white due to Shinobu's poison accelerating his age. He also grows numerous mouths all over his limbs, each one lined with a set of incredibly sharp teeth. His body also appears to have a dark red scale-like mass growing from his limbs, his forehead, and his entire lower body. It is later revealed that Muzan has an array of scars all across his body from the wounds inflicted during his battle against Yoriichi Tsugikuni, which had burned down into him at a cellular level and never fully healed despite happening over four hundred years ago. These wounds are not visible in plain sight and only come to light when his regeneration weakens.

*In his final confrontation with the Demon Slayer Corps, Muzan adopts a more monstrous and battle-esque form, with a dark-red scale-like mass covering most of his body (prominently on his limbs, his forehead, and the entirety of his lower body), sharp-toothed wide mouths all over of his body, and longer pale white hair. The sharp toothed jaws located all over his body in this form not only serve as his main form of offense in battle, but also have the purpose of helping him recover faster since he can use the jaws to tear apart his opponents and eat their flesh, simultaneously killing his opponents and regaining his strength at the same time.Now Inosuke, Zenitsu, Tanjiro, Sanemi and Giyu,Mitsuri,Obanai are the only ones left from the Hashiras And everyone was wounded and exhausted So Mitsuri and Obanai died together, Obanai had a scratch on his face that blinded him, Mitsuri lost both his arms, and Gyomei died from the deep wounds he received. of until muzan fighted his final struggle for survival Infinity Castle was destroyed and it was evening because he killed Nakime., Muzan is able to transfer the remainder of his blood along with his memories into a suitable body, turning his new host into a demon and exerting his influence. He successfully did this with Tanjiro when he was on the verge of death, reviving him after his death. Furthermore, this technique also allows the host to transfer their abilities, as seen when Tanjiro makes use of Muzan's whips and regeneration. This transfer, however, is not perfect as Tanjiro The reason he just The reason he injected his blood was because Nezuko was a demon and she was immune to the sun, so she thought Tanjiro was immune to the sun and He had a plan to turn Tanjiro into a demon.

Muzan Kibutsuji: *"You look disgusting tanjiro with that With a mass in your right eye."