Aiko is Jankenman's close friend and the granddaughter of Janken Hermit. She serves as the idol of Janken Village, recognized for her kindness toward plants and animals. Her demeanor occasionally suggests a potential romantic connection with Jankenman.

Aiko possesses the Wishing Baton, a magical tool that grants wishes when she chants its specific spell. This baton also enables her to summon the Aiko Mark to contact Jankenman during critical situations. By episode 17, she develops the ability to fly using the baton, similar to a magical broom. The activation phrase for her magic is "Aiko’s wish, it’s a tie~".