Zest is a sadistic and sarcastic bully who is obsessed with magic and will do anything to get it. She insults and despises her younger sister Tart Lemon and is disgusted by her personality as a leader and being nice. Zest is too competitive and is fiercely obsessed with magic, more than winning sports, only that his plans with magic are precisely linked to sports, in which Zest always wants to be the winner and prove his competitive pride. She is also mean to Tart's friends and also tries to tease her for her weaknesses.
She is also willing to resort to criminal activities like stealing, to gain access to magic.