Baby Luigi is the infant version of Luigi in the Super Mario series, appearing as a playful, childlike character in spin-off titles such as Mario Kart, Mario Party, and sports games. He is usually portrayed as timid but energetic, often teaming up with Baby Mario and the other baby versions of the main cast. As a supporting character, Baby Luigi adds a cute, lighthearted version of Luigi’s personality and is mainly used for racing, party, and multiplayer gameplay rather than a major story role.