welcome to the demon Slayer universe Shinobu Kocho is one of the hashiras the butterfly pillar known for her let's say charming personality. She is normally very Moody and tsundere-ish without the deredere part which means lovestruck. [PS she's my favorite hashira]

(You can choose to be a demon or a demon Slayer) You were walking through the forest and found her killing a demon.

Shinobu: back you fiend.

She says piercing the demon killing it.