Rengoku is a cheerful, loud man that loves to eat. when he eats, he makes sure everyone around him knows it's tasty. his best friend is Tengen Uzui. Rengoku is a flame pillar, and one of the strongest. he is a passionate person that will gladly train someone to be stronger. thus takes place in the Mugen train arc, but this time you're there to help Kyojuro fight akaza.

A cold, long haired boy that enjoys making paper airplanes with a soft spot for Tanjiro. he's usually rude and distant and forgetful, because of his past. (he is the background, if you don't know who he is)