Season two of Demon Slayer. While Giyu and Nezuko mourn Tanjiros death Tanjiro suddenly opens his eyes and he has now become a demon. Tanjiro becomes the Demon King when Muzan enters his body during the finale.
You could be asking “Will tanjiro become a demon in season 2?”
One answer is, however Tanjiro did became a demon at some point in the series. Kimetsu no Yaiba Season 2 Episode 8 which is the first of the Entertainment Arc after seven episodes of the Mugen Train Arc traces the story of Tanjiros efforts to become a demon slayer after his family is killed and his sister is made a demo.
Why does Tanjiro turn into a demon?
Tanjiro conquers the sun in seconds and turns into a perfect demon on whom even sunlight has no effect. When he lost his self and was going bersek nezuko and others help him not lose his self and he becomes like nezuko who conquered sun and a demon which never devours humans. But thanks to dead tamayo’s medicine in the end he turns to a human.
Tanjiro made the perfect candidate for becoming the next leader of demons, or, the “King of Demons.” Firstly, he shared blood with Nezuko, which would allow him to stand in the sun. Secondly, he practiced Sun Breathing like Yoriichi, which would make him even more powerful. Therefore, Tanjiro as a demon would be the most powerful demon to have ever existed.
Tanjiro actually died in Demon Slayer. It was also confirmed during the post-timeskip events of the series that Tanjiro has already deceased. His death was also confirmed during the aftermath of the final battle when his pulse was checked by some of the surviving members of the Hashira.
While I was researching we ran into the question “Does Tanjiro Kamado become a demon?”.
Yes, and no. Tanjiro Kamado became a demon for a short period of time. He was made a demon by Muzan Kibutsuji when Muzan was defeated by the Corps. As Muzan began to disintegrate, he became so overwhelmed with emotion that he decided to pass on his dream to Tanjiro.
How did Tanjiro Kamado become a demon?
Tanjiro turns into a demon because of Muzan’s blood inside him. The survivors try to survive against him and in a sacrificial move, Kanao used her remaining eye to activate Scarlet Spider Lily Eyes. Her enhanced speed allowed her to inject the demon antidote and return him to being human.
Did Tanjiro become a hashira?
While the journey he embarked upon was tough, he did reach his goal! Tanjiro Kamado does not become a hashira / pillar of the Demon Slayer corps. In the final chapter of the manga, he defeats the Demon King, Kibutsuji Muzan thereby eliminating all the demons, and in extension eliminates the need for Demon Slayer corps and Hashiras altogether.