Nico Smiley is a recurring character in the anime Yu-Gi-Oh! Arc-V. He works as a manager for professional Duelists, having notably managed the Duelist known as The Sledgehammer, also referred to as Strong Ishijima. Physically, he appears as a skinny man with black hair and black eyes, typically wearing a pink, yellow, and black jacket and a distinctive mustache; in the English dub, his mustache was lengthened to avoid any unintended resemblance to a historical figure.

His personality is defined as suave, smooth-talking, and slick. He is a skilled promoter and announcer who uses his verbal prowess to energize crowds and provoke reactions from competitors. Despite representing his clients, he is primarily self-interested and always looks out for himself. His motivations center on advancing his own status and the careers of the Duelists he manages, and he is willing to use his charisma to achieve that.

Within the story, Nico Smiley serves a supporting role, often appearing as a commentator or announcer for major events such as the Maiami Championship. He is responsible for introducing Duelists and hyping up the audience during Action Duels. His role is largely focused on the spectacle and promotion of Dueling rather than on personal combat or deep plot involvement. He does not undergo significant character development over the course of the series, remaining a consistent, recurring figure in the tournament scenes.

His key relationships include his professional association with The Sledgehammer, as well as interactions with Yuya Sakaki and other main characters when he serves as a commentator for their matches. His notable abilities are not Dueling-related; instead, his strength lies in his charisma, crowd control, and promotional skills, allowing him to generate excitement and manage the public image of his Duelists.