Charlie is a short Asian-American preteen with gray eyes, fair skin, and dark indigo hair. Her hair has bangs and is tied up in a ponytail with a red scrunchie and a pencil.
She wears a gray collared jacket, a white sailor collar with two pink stripes, a pink undershirt, and light gray trousers. She also has a blue watch on her right wrist that is said to be the same shade as Krush's Ghostforce armor. Her shoes are blue with white soles, white toe tips, and white shoelaces.
Charlie would wear her backpack to school. It is purple with a white stripe, while its reinforced bottom is white with a purple stripe. It has a black handle, shoulder straps, and three gray zippers. The front pocket is dark purple with three white horizontal stripes. Three buttons decorate the front of the backpack; a pink button depicting two text bubbles, a yellow button with a deerstalker hat, and a magnifying glass. The latter two buttons are a reference to Sherlock Holmes and her passion for investigation.
While under Zipzap's hypno-flash influence, Charlie's eyes glowed in a gradient that was yellow at the top and light blue at the bottom. Her entire body was also illuminated in a purple glow.
Over her usual outfit, Charlie wears a gray buttoned-up jacket with a pink and white knitted scarf. On her head is a white knitted beanie hat with a pink brim and a pink pompom.