Cosmo is a Seedrian, a humanoid plant-like alien race from the planet Green-Gate.

She stands at 3'0, weighs 15kg & has pale-peach skin. Her eyes are powder-blue with one long eyelash on each one, & she has short bright-green hair with a pair of bangs & a pair of paradise pink rose-like flower buds held by golden hair ties on each side of her head. She & other seedrians also lack a visible nose or ears.

Cosmo fled to Earth by herself on an escape pod after her space-colony was attacked by a robot army called the Metarex. All on the colony were slaughtered, including her mother & older sister. The Seedrians fled Green-Gate long ago to escape a war with another alien species. Cosmo's father refused to leave, so he & his men mutated themselves with Green-Gate's planet-egg to fight against their enemy, but also caused Green-Gate to wither & die.

For attire, Cosmo wears a green blouse bearing golden trims & an ankle-length, petal-like white skirt bearing bright-green tips. Her mother's Blessed Amulet is on her chest, & she wears white tights & green ballerina flats.

Cosmo is a kind & gentle individual, although she often feels guilt, anger & overwhelming sadness due to being unable to save the rest of her species from the Metarex. She also seems to suffer from low self-esteem, often calling herself "unworthy" or blaming herself for the hardships that she has to endure.

Cosmo can be somewhat clumsy, & will often rush headfirst into danger with little sense of self-preservation, even into situations that she knows to be a trap. Which can be put down to her survivour's guilt spurring her to sacrifice anything to atone for saving herself while her family perished. Cosmo can quite resourceful, but strongly dislikes violence & the need for conflict in life, like her father in many ways. But unlike him, she acknowledges that fighting is sometimes a necessity to achieving a better future.