Setsuna Higashi is a young girl who appears to be in her late teens. She works for Labyrinth until episode 23, and is the first of the original three members to appear, as well as the only female of the group. Her Pickrun, the Akarun, has a ribbon and wings. She can transform into Eas and Cure Passion.

As Eas, Setsuna initially had a cold and calculating personality. She was quick to anger and lacked any patience. She didn't care about others' feelings and was unwaveringly loyal to Moebius. However, after befriending Love, her personality began to change. The flaws in her character started to become apparent, and her stubbornness and pride made it difficult for her to admit when she was wrong. Upon being reborn as Cure Passion, she gradually transformed. Initially shy, reserved, and anxious after joining Pretty Cure, she started to open up more thanks to her friends. Over time, she became more cheerful and energetic. Setsuna eventually evolved into a kind, patient, and intelligent person who deeply cared for those close to her. However, she found it challenging to understand social cues and Earth's customs, often approaching situations with innocent naivety.

She was burdened by guilt over her past actions while working for Labyrinth, and even though she came to terms with it over time, the feeling never completely went away. Despite her transformation since her time as Eas, her seriousness and determination remained intact, now channeled into her battles as Cure Passion.