Mary is shown cruelly taunting her opponents during their gambling matches. She's also shown to be extremely egotistical both in and out of matches, often being confident in her victory. Mary also possesses a habit of mocking her opponents and laughing at them, especially when match seems to be her win. but after losing to Yumeko Jabami, Mary no longer be as arrogant and cruel as before. Mary Saotome is highly logical and focuses on the facts when making decisions. Mary is an abrasive Tsundere.