Suneo Honekawa, a wealthy child residing in Tokyo's Nerima Ward, possesses a short stature, spiked wedge-shaped hairstyle, and pointed facial features. His family's affluence, derived from his father's successful business ventures, forms the bedrock of his social standing, which he constantly references. This privilege fuels his habitual acquisition of luxury items, toys, and cutting-edge technology, showcased ostentatiously to peers, particularly Nobita Nobi. Such displays often culminate in Nobita's exclusion, frequently justified by Suneo with the recurring phrase that invitations or accommodations are "for three people only."

His personality blends narcissism, cunning, and insecurity. He regularly admires his reflection while proclaiming his attractiveness and leverages flattery to manipulate others, notably appeasing the physically intimidating Takeshi Goda (Gian) to avoid conflict. Despite aligning with Gian to bully Nobita, Suneo occasionally expresses covert sympathy for him and may collaborate with him against Gian's domineering behavior. Fundamental insecurities include chronic bed-wetting—necessitating specific bathroom sleeping arrangements—and anxiety about his height, being the shortest among his classmates. While typically cowardly during mundane conflicts, he demonstrates unexpected courage and loyalty in life-threatening scenarios, particularly during group adventures.

Suneo exhibits intellectual and creative aptitudes. He excels in model kit construction, remote-control vehicle operation, fashion design, and artistic endeavors, garnering praise from professionals and peers like Shizuka Minamoto. Academically, his performance remains average despite attending cram schools, with occasional failures provoking maternal disapproval. He harbors extensive knowledge of science and dinosaurs, sings proficiently unlike his tone-deaf friends, and has won writing competitions. However, these talents coexist with ethical shortcomings, including animal cruelty—such as taunting primates—and environmental disregard, like attempting oceanic garbage dumping.

His family dynamics involve a doting mother who indulges his material demands, a rarely seen father whose business achievements fuel Suneo's braggadocio, and a younger brother, Sunetsugu, adopted by a New York-based uncle. Extended relatives include a seafaring uncle, a wealthier cousin (Sunekichi) who mentors his hobbies, and a great-grandmother employing folk tales for moral instruction. Future narratives depict Suneo inheriting family enterprises as a company president and fathering a son resembling him.

Interactions with the protagonist group reveal complexity. His friendship with Doraemon involves mutual gadget-related curiosity, though Suneo occasionally schemes to steal devices for personal advantage. With Nobita, he oscillates between rivalry—provoking envy through exclusion or sabotage—and collaboration, particularly when uniting against Gian. Though he respects Shizuka's opinions and occasionally yields to her demands to include Nobita, he competes with Hidetoshi Dekisugi for intellectual recognition. His relationship with Gian combines sycophantic compliance, underlying resentment, and fear-driven submission, frequently resulting in Suneo becoming Gian's secondary target for bullying.

Character evolution is most evident in feature films and specials, where mundane hostilities give way to cooperative heroism. Though often initially panicked during crises, he contributes critical problem-solving skills—such as piloting vehicles or devising strategies—to ensure collective survival. These narratives occasionally position him as an unwilling antagonist under external control, though he consistently reverts to solidarity with the group. Despite this growth, core traits like vanity, opportunism, and exaggerated storytelling persist across all media.