Hermes is one of the four members of the idol group at the center of the series, distinguished by his origin as a classical work of art. He is based on the ancient Greek god of trade, travel, and thievery, and his marble bust is a representation of a famous sculpture by the classical Greek artist Praxiteles.

In terms of personality, Hermes presents a calm and rational exterior, often acting as one of the more level-headed members of the group when compared to the fiery Mars or the serious and overbearing Saint Giorgio. He is described as a multitalent who possesses an aura of suave worldliness and is fair-spoken, which contributes to an initial impression of being responsible and mature. However, this composed facade hides more mischievous and complex traits. He has the spirit of a young child and can be good-natured, but he also possesses a notably stubborn side. This combination makes him arguably the most duplicitous member of the Rockies, as he is not nearly as innocent as he first appears.

Hermes motivations are often tied to his mythological origins, particularly his role as the god of commerce and theivery. He secretly uses a full-body statue of himself that he owns to host gatherings, where he operates a scheme that resembles a multilevel marketing operation or a cult-like sermon. During these secretive events, he sells useless items as lucky charms, such as a simple steel bolt he calls the Celestial Screw. This entrepreneurial and manipulative behavior demonstrates a core motivation of profit and persuasion, showing he is far from the simple, friendly god he pretends to be.

In the story, Hermes role is that of the secret schemer and the rational voice that often gets caught in his own contradictions. He is the only member of the group shown to possess the rest of his sculpted body, complete with a baby version of the god Dionysus attached to it. This detail leads to a key moment in his development, where his manager confronts him for his actions, specifically demanding to know why, as a divine figure, he gave wine to the baby Dionysus over two thousand years ago. This event highlights how the characters mythological pasts directly influence their present behavior and comedic conflicts.

His key relationships are primarily with his group members and his manager. While he interacts with all the Sekko Boys, his actions often occur away from them. The most significant dynamic is with the group's manager, who eventually discovers his secret business and scolds him severely, reinforcing the show's central joke of an exasperated human dealing with the absurdities of immortal statues. He also maintains his role as the god who once cared for the young Dionysus, adding another layer to his mythological connections.

Development for Hermes is not linear in a typical dramatic sense but rather reveals hidden layers. The narrative peels back his initially charming demeanor to expose the cunning and slightly unscrupulous god of trade underneath, yet it never fully dismisses his more amiable qualities. A notable ability of Hermes, stemming from his status as a god and his depiction in art, is his multitalented nature. He is presented as a Renaissance man, a jack of all trades, and a smooth talker with the skill to persuade others. This natural charisma and cunning are his most prominent and dangerous assets.