Onpu appears in the second half of the first season. She is a child idol, being a singer, an actress, and having her own morning radio show. Hence, she has a large male fanbase who will chase her anywhere. She is also a witch, but was once under the apprenticeship of Majorika's rival, Majoruka.

One important fact about Onpu is that at first she comes off as a selfish and spoiled brat. She then reformed her ways and joined Doremi and co.

Onpu has no real love interest, but she shows affection for Tooru of the FLAT4. Onpu's birthday is March 3, her favorite color is purple, and her instrument is the flute. Her family consists of her parents.