17 yrs old. Ran Mori's friend. Case closed name is Serena Sebastian.Daughter of Suzuki Zaibatsu head but Sonoko is not proud and is even very friendly and modest. Sonoko never underlook people who are poor. (Movie 6 Baker Street Phantom, go look inside)Always make joke on Rachel by speakin on Shinichi.Boyfriend is Makoto.Friends are Rachel Moore/Ran Mori and Kazuha Tooyama (Katrina T)Always wish to find a gorgeous boyfriend herself.Sometimes, Conan would avail Serena(Sonoko) by shooting Sedative dart to Sonoko and use her voice to solve murders.