Mona has a tomboyish personality, as she is said to be spunky, and she is often seen driving a motor scooter. Her aspiration is to become a famous treasure hunter, and she admires Wario for his exploits. Other interests of hers include music and fashion; she plays bass in a band, and considers Wario to be her "fashion icon". Mona is versatile and always willing to help, as seen by the variety of jobs she undertakes with her employer Joe. She is very dedicated to her work and school, and if she is late, she does everything it takes to be on time—even if it means breaking the law and avoiding the police.

However, Mona is also willing to speak out aggressively if her employer is treating her unfairly, and she often complains if she isn't paid or her work is undervalued. Although she likes Wario and even looks up to him, she called him a "greedy punk" after realizing that he received all the credit for the microgames, and when he attempted to escape, she was the only employee that pursued him. Mona appears to be popular among her peers, and she seems to have many friends, human and animal alike. Despite this, according to the official Japanese websites for WarioWare Inc. Mega Microgame$! and WarioWare: Smooth Moves, she often feels lonely because her mother is rarely at home and her father is a reclusive artist. She is empathetic toward Ashley, who also misses her parents.