Age: Unknown
Height: 98 cm
Race: Harvin
Hobbies: Saving money
Likes: Fun and excitement
Dislikes: Pain and sadness

Member of the Harvin species, Sierokarte is the shop owner of the Knickknack Shack which appears to have shops all around the Phantagrande Skydom. Despite her petite stature and childish voice, she is an adult, but often gets mistaken for a child. Ever cheerful, she provides missions for Gran and his team. She likes to make puns a lot and has an ability to be able to seemingly appear anywhere.