Earth-Chan appears as a youthful girl with light skin and short blue hair that features distinctive green continent shapes. Her hairstyle includes bangs, with her right sidelock tucked neatly behind her ear.

Her standard attire consists of a school uniform featuring a crisp white shirt paired with a galaxy-patterned tie and matching skirt. She completes this look with black thigh-high socks and formal shoes. In her casual wear, Earth-Chan opts for a white t-shirt adorned with the NASA logo.