The Assistente di Zen'ō A is one of a pair of identical entities who serve as the personal attendants and bodyguards to Zen'ō, the Omni-King who rules over all twelve universes. These two attendants, who are formally known as Zen'ō no Tsukibito, are always seen together and perform their duties as a single, coordinated unit. Their visual design is highly distinctive; they are exceptionally tall and slender, with pale, celestial blue skin and a single orange antenna on their heads that ends in a small sphere. They wear matching formal attire consisting of a long, high-collared purple jacket with large golden buttons and trim, underneath which is a grey, segmented bodysuit. Their uniform is completed with yellow gloves and boots that have purple tips, and they are most often seen hovering motionless with their hands clasped behind their backs, their expressions fixed in a permanent, menacing glare.

In terms of personality, these attendants are the embodiment of discipline, vigilance, and absolute loyalty to their master. Their primary motivation is the protection of Zen'ō and the enforcement of proper protocol and deference from any being who approaches him. They are extremely serious about their duties and react swiftly to any perceived threat or breach of etiquette, such as when Son Goku attempted to approach Zen'ō to shake his hand, the attendants instantly appeared before him to block his path. They rarely speak, and their only known line of dialogue is a brief, informal farewell of "Bye-cha!". Despite their menacing appearance and serious demeanor, they are not without emotion; they showed visible signs of surprise and nervousness when Zen'ō allowed Goku to not only approach but also lift him up during their handshake, and they were also shocked when the two Zen'ōs announced their plan to erase several universes. Over time, they became accustomed to Goku's casual and disrespectful behavior toward their master and eventually ceased their attempts to intercept him.

Within the story, their role is exclusively tied to the presence of Zen'ō. They debuted by accompanying him to the site of the tournament between Universes 6 and 7, where they stood guard while he observed the matches. Later, after the Future Zen'ō was brought into the main timeline by Goku, a second pair of attendants appeared to serve him, resulting in a total of four attendants who accompany the two Omni-Kings. Their key relationships are hierarchical and defined by service. They are entirely subservient to Zen'ō, whom they fear and respect immensely, and they will stand down instantly when commanded by him. They have no known personal relationships with other divine beings, though their intimidating presence is enough to make even the Gods of Destruction and Supreme Kais uneasy. The two attendants share a symbiotic and synchronized partnership, always acting in unison to protect their master and escort him from place to place.

Regarding their abilities, while the full extent of their power is never explicitly demonstrated, it is implied that they are incredibly strong, as they were chosen to be the personal guardians of the most powerful being in the Dragon Ball multiverse. Their most notable skill is a form of high-speed travel or instantaneous warp, which they use to escort Zen'ō across the vast distances of the universe, appearing and disappearing in a shimmer of light. They also have the ability to open portals beneath their feet to relocate instantly, such as when they appeared in front of Goku on the fighting stage. Despite their strength and protective role, their development throughout the series is minimal, as they remain static, unchanging figures whose sole purpose is to serve as the silent, unwavering guardians of the Omni-King.