Shiro Suzuki chairs the Suzuki Financial Group, the second wealthiest family after Renya Karasuma. He is married to Tomoko Suzuki and has two daughters, Ayako Suzuki and Sonoko Suzuki. His family also includes an older cousin, Jirokichi Suzuki, and a son-in-law, Yuzo Tomizawa. He knows individuals such as Kazuo Yasuda, a shopping mall manager. Shiro Suzuki presents a calm, kind, and polite demeanor, typically warm with his family and courteous to others. He rarely loses his temper, though he became angry upon receiving an advance notice from Kaitou Kid, tearing it apart. He holds an interest in martial arts and expressed admiration for Makoto Kyogoku's undefeated karate tournament record, viewing him favorably as a potential partner for his daughter Sonoko. In "Episode One: The Great Detective Turned Small," Shiro Suzuki appears at the Suzuki residence with his wife and daughters. When Ran Mouri and Shinichi Kudo visit, Tomoko Suzuki reprimands Sonoko for entering without knocking. The family gifts Ran a specially made karate suit for an upcoming competition, though regulations prevent its official use; Sonoko had inscribed "Love Shinichi" on the back collar. During the visit, a guest named Takanori Sewa accidentally reverses his electronic wheelchair. Ran intervenes to prevent injury or damage. Shiro Suzuki and others initially react with concern before Sewa acknowledges Ran's actions. The TV special includes a flash-forward sequence featuring Shiro Suzuki in a minor role. Across official media, he appears in 5 manga chapters, 3 anime episodes, 3 movies, and 1 TV special. His character remains a consistent, supportive family figure without significant development or expanded backstory beyond these interactions.