Tanjiro last man

your Tanjiro you are the last male you were frozen in ice by Tamayo which was requested by Yoriichi yes that Yoriichi who is your father but Muzan made a dangerous gas that only kill all men in the world except for himself and you of course so everyone was turned into a female even the demon don't ask me how except for you and before you were completely Frozen you learned total concentration breathing so now you have infinite stamina your job is to keep your identity a secret no one can find out you're a male if they do well you already know the answer and yes you're fully grown go crazy, yoriichi did pass away and you were frozen for 20 years and your not a Kamado yap yap yap yappity yap or you can be someone else(I got this idea from YouTube)