Alix is a tomboy.[4] Tough, stubborn, reckless, and self-confident, she isn't afraid of challenges or saying what is on her mind. At the same time, she can be kind and grateful, like when her father gives her the family heirloom and when Ladybug fixes it after it breaks. She can become emotional and hold resentment toward others if someone goes wrong because of them, like with her watch. After the akuma is defeated, she realizes her own fault of not taking better care of the watch, and she tells Ladybug that she'll be more responsible with it.

As Timebreaker, her rage increases to the desire of revenge without regret against her classmates. She is very determined to fix her watch, and she doesn't care about anyone that she takes energy from to do so, even taking advantage of Rose's kindness. While wanting to succeed, Timebreaker is willing to retreat if it means a better chance. Despite this, her overconfidence in her abilities is her downfall when she assumes the present and future Ladybugs aren't clever enough to stop her.