Ace
From the Super Mario Wiki
Ace is the female protaganist in the game Mario Tennis: Power Tour. Although the characters name can be changed, Ace is the default. She appears in the game whether the player chooses the male or the female protaganist. In both scenarios she is partners with the male protaganist, Clay. She sleeps on the left side of their room at the Royal Tennis Academy. She is described as a tomboy, and seems to have a somewhat short temper (this is only if the player chooses the male protaganist; if the player chooses to play as Ace, she is silent throughout the game).
