Tsubaki Nakatsukasa is a two-star demon weapon hailing from the Nakatsukasa Clan, a weapons clans whom are direct descendants of the weapons created by Arachne Gorgon and are famous both for members inheriting multiple weapon forms and the Uncanny Sword transformation. She would be the first clans member to join Death Weapon Meister Academy, having done so to prevent her brother form becoming a kishin and is paired with the meister, Black☆Star.