Dianne (ダイヤン, Daiyan) is a fantastical creation of Tsugiha Yojirou, created to be a companion and mentor to Yojirou's magical girl persona, Tsugihagista SS Ruby-Sapphire the Fifth (also known as Magical Wonder Tsugiha from the Neighborhood).
Dianne acts as a friend and mentor to Magical Wonder Tsugiha, alerting her when there is trouble, and guiding her through the development of her magical girl powers. Yojirou claims that it was Dianne who first told her of her destiny as the chosen warrior of heaven, as well as the threat to Earth posed by the Great Demon King War-Gold. According to Yojirou, Dianne most often sits on Yojirou's right shoulder. Dianne has a speech quirk, and likes to end her sentences with "Dai" sometimes.
Dianne is a cute little creature with floppy ears, stubby limbs, and a tail. She wears a bow around her neck, and has some sort of jewel set into a protrusion from her head. Dianne has a band around each limb. As a creation of Yojirou's imagination, Dianne cannot be seen by other people.
Kurokami Medaka's Successor Arc
Unknown Shiranui Arc
Levitation: Dianne's abilities are known only to Yojirou, though is she is capable of levitation.