Saline is a twin Cocotama born alongside her brother Paline from the same Rinse Shampoo bottle egg used by the Yotsuba family, granting both status as Shampoo Gods. They remain the only Cocotamas known to share a single egg. As the older sister, Saline exhibits an active, optimistic, and positive-thinking personality. She radiates curiosity and energy, proactively embracing new experiences with a smile even when intimidated, occasionally leading to playful troublemaking. Contrasting Paline's timid negativity, Saline consistently motivates him toward brighter perspectives.

Her appearance features a predominantly white body with white markings around her ears and face, complemented by fluffy light pink hair and a matching tail. She has dark teal eyes and wears eggshell pants displaying a water drop marking centered with a sparkle.

Saline's rejuvenation magic focuses on bathing rituals, reflected in her full ceremonial title "Sapari Awa-Awa Arai-no-Mikoto" for refreshing spirits during baths. Her name originates from the Japanese word "sappari," meaning "skillful" or "refreshing." She shares a critical trait with Paline: both react intensely to dirt, becoming agitated or "going berserk" upon accidental contact.