Alex is an odd mixture between a tomboy and a girly girl. She is the most athletic and fitness-minded spy of the team. She loves to play sports, especially soccer, video games, and is always trying out some new fad diet.

Alex is also the most naive and absent-minded. She interpets some figures of speech literally.

Alex is also the youngest and most childish, seeing as her oldest and dearest friend is a stuffed turtle named Ollie and she has a teddy bear backpack. She is often seen as the little sister of the group, as Sam and Clover are the two big sisters who dominate over her. Another characteristic of Alex is that she's always about keeping her friends happy. She often serves as a link between Clover and Sam who have meaningless squabbles. Alex is also a big animal lover and she likes petting zoos .

Despite being the most athletic, she tends to be clumsy, and has been prone to bad luck (Alex can be very superstitious). Alex is also the second girliest. She is very concerned about fashion and boys, to the same extremes as Clover; an obsession that Sam has trouble understanding.

Another one of Alex's hobbies is eating. Even though she may be the most healthy of the three spies, she likes to eat the most.