Alexandra has short black hair, light brown eyes, and dark skin; she dons a yellow catsuit on missions. She is described in the Télétoon profile as the best friend character, affectionate and not afraid to show her feelings. She enjoys sports and athletics but also shares her friends' fashion interests. She is the most naive and absent-minded of the three, sometimes interpreting figures of speech literally, often thinking it was literally going dark just because something is blocking her sight, or picking up and eating foodstuff at crime scenes that is potentially harmful. In the episode "Do You Believe In Magic", it is revealed Alex is the youngest of the three girls (and Clover the oldest). Her driving ability becomes a running gag in some episodes, despite the fact that she keeps getting to take the wheel and proves to be capable of improvising dangerous car stunts. She is sensitive and sometimes gets down on herself. Starting with season 3, Alex reveals interests in Taekwondo, skateboarding, soccer and video games. Alex appears to be racially mixed at first, having a dark-skinned mother and a white father in the season 4 episode "Alex Gets Schooled"; however, her father later appears with a completely different physical appearance, notably with dark skin in the season 6 episode "Evil Ice Skater". In Totally Spies! The Movie, which takes place when the girls first transfer to Beverly Hills High, she adopts a baby pig whom she names Oinky (French: Groin Groin), who does not appear in seasons 1-5 but recurs in season 6 when the girls have already gone to college. Although Alex says she is allergic to cats in season 1 episode "Wild Style", she later works in a university cat lab in season 6 episode "Nine Lives" without problems.
Alex is voiced by Katie Leigh for the first two seasons and by Katie Griffin in the following seasons for the English dub. In voicing Alex, Griffin used a higher vocal register than usual. She was worried about nodules developing and about being recast when the series returned for season 6 following a hiatus, but was happy when she could return. She found the part to be really fun, easy to play, and liked that Alex was so lovely to animals. Alex is voiced by Céline Mauge in the French dub.
