Tsubaki Nakatsukasa is a demon weapon partnered with Black☆Star hailing from the Nakatsukasa Clan, a special weapons clan that are direct descendants of demon weapons created by the mother of magic weapons, Arachne Gorgon. Having inherited the unique multi-form ability of her clan, she joined Death Weapon Meister Academy to stop her brother from becoming a kishin. As one of the oldest members of her teammates, Tsubaki is one of the most mature and level-headed, aside from Maka. However, she is not as short-tempered as the scythe meister and is very patient and forgiving. She has a very magnanimous, polite, and gentle personality and always tries to help or comfort her friends even when she has no idea how to help. She is caring and understanding and sometimes acts as the mediator when her friends fight, and her understanding and insight sometimes makes her the agony aunt figure for troubled people. She cares deeply for her friends and does not seem fond of things that might make them upset. She is also generous and kindhearted, up until the point that some people even take advantage of her. She also has a habit of apologizing, even when it isn't her fault (something which she often does when Black☆Star does something wrong in front of people). One of the most mature and flexible characters, Tsubaki is very amicable and gets along well with her peers, and can be very understanding of their feelings. Tsubaki's soul is very cooperative and has a lot of space to accept people.