Sonoko Suzuki, a 17-year-old student in Teitan High School's Class 2-B, is the second daughter of the affluent Suzuki family led by her father, Shiro Suzuki. Her family comprises her mother Tomoko Suzuki, older sister Ayako Suzuki (later Ayako Tomizawa after marriage), brother-in-law Yuzo Tomizawa, and her father's cousin Jirokichi Suzuki, known for his frequent attempts to capture the phantom thief Kaitou Kid. The Suzuki family company ranks among Japan's largest corporations, surpassed only by the Karasuma Group. Her enduring friendship with Ran Mouri began in kindergarten, sustained by mutual respect; Ran consciously avoids financial reliance on Sonoko's wealth, declining subsidized trips to preserve their equality. Sonoko was initially characterized by her boy-crazy nature, actively pursuing romantic interests through methods like crafting chocolates, flaunting attention-grabbing outfits, and attending events to meet potential partners. She often felt jealousy when Ran inadvertently attracted her romantic targets, yet this never fractured their bond. Meeting international karate champion Makoto Kyogoku shifted her romantic focus. While she retains occasional flirtatious tendencies—particularly toward Kaitou Kid—Sonoko demonstrates loyalty to Makoto through gift-giving and orchestrating romantic meetings, sustaining their long-distance relationship. Her personality blends impulsiveness, a fiery temper, and romantic idealism. She frequently acts without forethought, dragging Ran and Conan Edogawa into her schemes. Despite her privilege, she exhibits humility, rejecting the use of wealth to purchase friendships or influence. Conan occasionally employs his tranquilizer watch to temporarily incapacitate Sonoko, impersonating her voice to solve cases. This practice fuels her self-proclaimed title "Deduction Queen," fostering a belief in her own detective skills. Conan initially struggled to mimic her distinctly feminine speech patterns but has improved over time. While he sometimes regrets exploiting her due to her inflated self-perception, he acknowledges her courage in perilous situations. She sporadically displays deductive competence, such as solving cases using Conan's non-verbal cues during his illness. Sonoko appears in several OVAs, including "A Challenge from Agasa! Agasa vs. Conan and the Detective Boys" (OVA 7), where she witnesses Professor Agasa's kidnapping in a supporting role, and "High School Girl Detective Sonoko Suzuki's Case Files" (OVA 8), where she actively investigates cases embracing her "Deduction Queen" persona. Additional traits include her fandom for the band LEX and pop group Two-Mix, enjoyment of luxury vacations and fashion, and using Conan to access child discounts at food festivals. She uses polite formal address, referring to her uncle as "Oji-sama" and guests as "Okyaku-sama," while using casual terms like "Papa" and "Mama" for her parents. Despite her confident demeanor, she reacts with typical fear to dead bodies. Physically, she stands 165 cm tall and often wears bandannas, skirts, and revealing tops to attract male attention. She temporarily sported a permed hairstyle in "Countdown to Heaven" that resembled Shiho Miyano's appearance.