Sueo Maruo, commonly referred to as Maruo-kun, is a third-grade student and a supporting character in the series Chibi Maruko-chan. He serves as the male class president of his class. His full name is Sueo Maruo. He is characterized as a smart and polite boy who strives to be a role model for his classmates. However, his primary motivation for his actions is securing victory in the next class president election. He is deeply concerned with maintaining his position and is paranoid that his classmates are seeking to replace him, often targeting those who stand out to discourage them from running against him. He wears thick glasses due to his diligent studying habits. His efforts to help his classmates are genuine, but they frequently prove futile or backfire, leading to comedic situations. He is known for his catchphrase, Zubari sou deshou, which translates to That's exactly it, isn't it. His favorite foods include loquat, cold soba noodles with dipping sauce, and tempura. Maruo-kun is a supporting character whose role revolves around his duties as class president and his interactions with the main character, Maruko, whom he often finds frustrating. He has a competitive but earnest relationship with his classmates. His notable abilities include his academic studiousness and his persistent, if often misguided, dedication to his class president role. Throughout the series, he remains consistent in his ambitions and anxieties regarding his position, with little change to his core personality.