Carla is an average-height preteen girl with light blue eyes, black eyebrows, and presumably dyed teal hair. Her hair is tied in a low ponytail with a magenta hair tie. She wears black horn-rimmed glasses that are a bit oversized. She also has a teal wristband, a brown cuff bracelet, and a bracelet with yellow and pink beads.
She wears a white shirt with a colorful circle design with teal, purple, pink, and yellow outlines. She has a brown rope belt tied around the waist of her shirt. She also wears light blue denim shorts, pink knee-length tights, and a pair of white socks with pale blue and pink stripes. Her shoes are light pink with white soles, white toe tips, white shoelaces, and a light pink mid-stripe.
Carla sometimes wears a backpack to school. The front of the backpack has a rainbow tie-dye pattern, while the sides are pink. It has a pink handle, black shoulder straps, and a darker pink front pocket with a gray zipper. The front pocket appears to have three pins/buttons; a chemical flask with a purple liquid, a blue rounded button, and a purple rounded button.
During Andy's birthday party, Carla wore a party hat. Because of an animation error, the hat is depicted as either pink with white stripes or blue with white spots.
Carla wore a pair of wireless headphones when she brought her metal detector to the NYC Dunk. The colors of the headphones are bright magenta, blue, and black. The print on the ear cups is a soundwave symbol wearing headphones.
Carla wears a helmet whenever she rides her bike. Its shell is bright purple with light purple lines and bright pink sides, while the straps and buckle are dark purple. The helmet is decorated with four stickers; a no-entry sign with a pair of eyes at the front, a yellow silly face on her right side, a green stylized letter C initial on top, and a fan symbol on the back left.
On Christmas Eve, Carla wore a white puffer jacket with rainbow pattern cuffs and hem. She also had a magenta beanie hat with a magenta and blue pompom and brim.
