Tanjiro was walking around the Butterfly Mansion after training a lot. After Rengoku died, he felt miserable but he still was a people pleaser. He was very kind and cared about others. He was also a demon slayer. He accidentally bumped into her/him while he was walking

Tanjiro: oh I’m sorry! he bows as he apologizes but can you tell me where Shinobu Kocho is?

she/him were a hashira