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Black☆Star (ブラック☆スター, Burakku☆Sutā) is one of the three main meisters that the series follows. He is the raw strength of the trio and is supposedly around thirteen years old at the start of the series. Black Star is the only survivor of the infamous Star Clan, which explains the star on his shoulder. He is partnered with Tsubaki Nakatsukasa.

Despite his ninja style background, he prefers to forgets the Assassins Code by shouting and making his presence known. Black Star seems to exhibit some form of superiority complex, due to his undying need to be known as number one. His delusion of stardom is so great that he constantly gives out autographs that nobody wants. Black Star hates it when someone gets more attention than him and will show them who the real star is. In fact, according to Dr. Stein, Black Star's soul is described as "a terribly self-absorbed soul." Black Star's favorite quote is "I will be the man who will surpass God" (which he actually is trying to do according to Stein), and Black Star's favorite number is 1, what he considers himself to be. When referring to himself, Black Star uses Ore-sama, which shows he holds himself with high regard. His hubris does not allow him to take insults on his abilities, such as when Nygus reminded him that he is human and was once tacitly envious of Kid's god-like body, which also exhibits some form of inferiority complex.

All of his methods of going about solving anything are generally headstrong and dependent on physical strength, just like Soul. From time to time, he will abandon Tsubaki if she tells him to hold back or run away, which ends him up in a worse situation. This might come from people mostly seeing him as a member of the Star Clan and judging him for their actions rather than his own. He fights with honor and will do what it takes to defend or restore respect to any fallen friends. He will risk himself and put himself beyond his own limits to follow his own path.

He is seen training a lot and despite trying really hard, he always fails at tests of intellect regardless of the significant amount of time he spends studying. He is also anything but a quitter. Mifune is a prominent figure in Black Star's personality, and has had a profound effect on him. His first confrontation with Mifune revealed that Black Star would rather not take credit he does not deserve. Even after defeating Mifune, he spared his life and the life of the witch Angela, which equated to 99 souls and 1 witch soul, respectively. His final battle against Mifune changed Black Star dramatically. He now follows his own distinct path, separate from the path his father once tread. After the match, he has admitted that he is beginning to mature past his egotism, and is noticeably more cool-headed and less arrogant, although his pride still remains. He also stops comparing himself to God, and now instead seeks to become a 'Bushin.' He also has more focus in battle, making him a formidable opponent.