Benedict, also known as Bennett, is a character from the anime Bye Bye, Earth. Benedict is a member of an androgynous aquatic species often referred to as mermaids, a race with the unique ability to possess both a female and a male form. This character first appears in the story in the female form, going by the name Benedictine. After sustaining a significant injury, specifically a wound to the left eye during a battle in the Catacombs, the character shifts to the male form and is subsequently called Bennett. This transformation is a defining characteristic of the mermaid race within the series' world.

In terms of background, Benedict operates as a key member of a musical troupe known as the Sword Band, where the role is that of a stage manager or director. This position highlights a creative and organizational aspect to the personality, contributing to the group's performances and strategies. The very nature of existence as an androgynous aquatic being makes Benedict a figure of curiosity and fascination to others in the world of Bye Bye, Earth.

The personality of Benedict is deeply intertwined with the unique biology of the mermaid race. Members of this species are known to mirror the personalities of the people they form close relationships with, rather than having a fixed identity of their own. This leads many of them to prefer numerous shallow relationships over a single deep bond. This aspect of the lore is crucial for understanding Benedict's motivations and emotional state. For a time, the personality was largely based on a character named Gordon. Following Gordon's death, Benedict experienced an emotional breakdown. Subsequently, the behavior began to shift, increasingly mirroring that of the protagonist, Belle Lablac. This demonstrates a fluid and reactive personality, heavily dependent on key relationships.

The primary role in the story is closely tied to Belle Lablac. Initially, Benedict and Belle are perceived as opposites or even rivals who are incompatible. However, this dynamic changes significantly following a major battle. During this conflict, Benedict's skills and contributions are instrumental, leading to a rapprochement between the two characters. Their relationship evolves from one of distance and conflict to a path of understanding and close cooperation. Benedict becomes a crucial ally to Belle, with the mermaid believing in the protagonist so strongly that it leads to a major turning point in the narrative. In the second season, it is revealed that Benedict makes a profound sacrifice, giving up life to heal Belle from severe physical and mental wounds, an act that strips Belle of a mysterious infection. This sacrifice underscores the depth of loyalty and care that developed, transforming what was once a rivalry into a bond of ultimate selflessness.

The development of Benedict is marked by the gender shift from Benedictine to Bennett, a physical change brought on by injury that also symbolizes a new phase of existence. More significantly, the development is seen in the evolution of the relationship with Belle. Starting from a point of mutual incomprehension, the two become trusted partners, with Benedict's actions ultimately defining the character's legacy through sacrifice. The story also explores the complex nature of the mermaid species, as other characters ponder whether a mermaid can exist as two separate physical entities simultaneously, with one form staying with Belle while another form appears elsewhere, though the ultimate fate appears to be a permanent end following the sacrifice.

Notable abilities include mastery over ice-based occult arts. Benedict can create ice barriers at will, using this magic defensively to protect allies from enemy assaults. In addition to this magical proficiency, Benedict is also an exceptional archer, capable of accurately striking distant targets. This combination of defensive magic and martial skill makes Benedict a uniquely valuable asset in battle, providing both protection for the group and a tactical advantage in combat situations.