The Hashira started out as mysterious, seldom-seen characters in Demon Slayer: Kimetsu no Yaiba. The most powerful sword-wielders in the Demon Slayer Corps, the Hashira are so strong that they fill the Lower Ranks of the Twelve Kizuki with terror. Even the Upper Ranks regard them with a healthy level of respect for their skills. As the series progressed, the Hashira became more and more involved, going from fleeting cameos to key players in several major story arcs. Unfortunately, not everyone made it to the end, leaving many to wonder which Hashira survived.
Source：https://www.cbr.com/demon-slayer-ending-explained-every-hashira-fate/
