Soleil is a 19 year old spacebot with light-fair skin, long red hair, green eyes and freckles. She wears a yellow heart hairpin on both sides of her hair, light yellow tight zentai suit, pale yellow wristbands with a yellow heart on both, sleeveless yellow knee-length dress with a pale yellow heart, pale yellow cap sleeves and a pale yellow belt with a bright yellow heart in it and yellow boots with a yellow heart on both. Her magic powers has yellow hearts in it. She is the eldest of three sisters and her signature color is yellow.
In the TV series, Soleil is very determined, smart, beautiful, lovely, cheerful, friendly, sunny, and bright and is the leader of her sisters and the Space Girls, and she is the eldest of the Space Sisters. She also has a crush on Sam.