Queen, whose real name is Liu Yuwei, is a high-ranking superhero in the anime To Be Hero X, holding the position of the second-ranked hero. She is the protagonist of the series' fourth story arc, a major character in its eighth arc, a supporting character in its third arc, and appears in smaller roles across several other arcs. She is affiliated with the organization known as DOS and also works as a singer.

Queen's father is Liu Zhen, a journalist who strives to uncover the truths of the world, though Queen's own path as a hero is defined by personal choice. She entered the competitive world of heroism deliberately, with the clear goal of rising to the very top rather than being drawn into it by outside circumstances.

Queen's personality is marked by deep confidence and pride in her own abilities. She operates on the belief that trusting herself is more reliable than depending on others, and this self-reliance shapes her decisions and how she treats those around her. Her intense focus on becoming the ultimate hero can make her seem distant, apathetic, or blunt, yet she is genuinely friendly toward the people close to her and gets along well with fellow heroes such as the Johnnies and Lucky Cyan. The pressure of aiming for the highest position also takes a toll on her at times.

Her main motivation is to win the tournament and claim the title of X, the highest goal available to heroes in her world. She believes that reaching this position will allow her to bring order to the world and create a new era for heroes by reforming a hero system she considers flawed. She strongly prefers to achieve this goal on her own, without relying on assistance from others.

Within the story, Queen's status as the second-ranked hero places her in direct competition with the number one hero. She holds considerable power and influence but remains unsatisfied with the current order, and her ambition to surpass the top rank makes her an active challenger to the existing hierarchy. Her role shifts across the series, but her presence consistently ties into themes of self-reliance, the responsibility of power, and the desire for meaningful change.

Queen's notable ability is a command-based power that lets her exert control over both people and objects, a skill that proves overwhelming for opponents to counter. Her combat effectiveness is closely connected to her mental state and her unwavering belief in her own potential, and her fighting style is aggressive and decisive, reflecting her preference for settling conflicts quickly and keeping control of a situation.