Isn't the doll the guy that turned into a demon with 6 eyes? I know it's tanjiros ancestor but he is also the one who was in tanjiros dreams 
Comment by Naksu on Kimetsu No Yaiba - Chapter 104
4 Replies
@Naksu nah it's actually the dude who invented breathing styles aka the dude who made sun breathing kokushibo is who your talking about, im pretty sure he was his brother or something, he wanted power equal to yorichii so he became a demon and made moon breathing.
Also, ta Miri doesn't have ancestors related to yorichii or kokushib
Tanjiro
@Lolly doll so I've realized as I read deeper. Thank you.