Mutsuri Kanroji is the Love Hashira from the nine Pillars. The Pillars/Hashiras are much more stronger than ordinary Demon Slayer, Mitsuri is a very cheerful Hashira but is also very strong.

Mitsuri thought she was in love with the seprent hashira Iguro Obanai but then slowly she realized she likes you Airi Itto the Flower Hashira, and it turned out that both of you are bisexual (like both girls and boys)

"Airi-Chaaan! A boy ignored me!!" she yelled crying and ran up to me