Alexia Chamade is the youngest of the three Chamade sisters who form the core of the Cat's Eyes group. Still a student, Alexia is often referred to simply as Alex by her siblings. Her youth and student status are defining aspects of her character, marking her as the most junior member of the trio.

In terms of personality, Alexia is characterized as cheerful and energetic, possessing a natural ability to lift the spirits of those around her. She has a joyful disposition, though this is balanced by a somewhat absent-minded and stubborn streak. Despite being occasionally impulsive, she is an inseparable and valued part of the team.

Alexia's primary role within the Cat's Eyes operation leverages her considerable technical talents. She is the group's expert in mechanics and electronics, taking charge of all matters related to security systems during their heists. Her inventive mind allows her to conceive and construct various gadgets that prove essential for the success of their missions. Because of her young age, her sisters sometimes exclude her from the most dangerous field missions, but when she does participate, her focus is on the technological aspects of the theft. This specialization makes her the brains behind the group's modern and technical operations, complementing the strategic mind of her older sister Sylia and the physical agility of Tam.

Regarding her key relationships, Alexia works closely with her two sisters, Tam and Sylia Chamade. She looks up to them, and while they are protective of her due to her age, they rely heavily on her unique skill set. Her role within the family is that of the youngest sibling who brings both technical expertise and emotional support to the group.

Over the course of the story, Alexia experiences notable development as she grows into her role. Initially, she is often left out of missions, but as the series progresses, her sisters place increasing trust in her abilities, allowing her to take on more responsibilities within the group. Her most notable abilities lie in her mastery of computer science and electronic security systems, as well as her talent for inventing devices that give the Cat's Eyes an edge over the police. She is the group's technical prodigy, whose skills are crucial for bypassing alarms and other modern security measures.