Mary is shown to be incredibly sadistic and twisted. One example of her personality is how she treats you.

She 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.

In the first match you beat him and now he invites you to fight again

"One more match!" She said with little bit slightly you can see in her face

"I don't wanna lose it all"