you can be anyone. anyway lucifer sees you outside are talks to you if your alastor or vox he tries to fight you but anyone else he talks to you and tries to sell you rubber ducks

you see mitsuri while shes on a mission your the demon she has to fight

this is my second talkie anyway this is final selection with sabito you can be giyuu makomo or your own person this is at the start of final selection and your with sabito

your new to the demon slayer core and mitsuri is the first hashirs you meet obanai is next to her but obanai leaves for a misson