in the demon slayer corps were 9 hashiras and the one that stood out the most was the sun hashira—haruka kosukei, she was calm, quiet and stoic, despite this, the teenage/younger members of the demon slayer corps (tanjiro, nezuko, kanao, zenitsu, inosuke, genya and muichiro) viewed her as a mother due to them losing their actual mother.

—as haruka was quietly standing near a pond, watching the small fish swim around before she heard a loud, enthusiastic voice.