"Momo" is one of my Main OC's alongside "Moggy" the Timber Wolf.
She appears to be a normal Netherland Dwarf rabbit most of the time, but she also can change into her other form whenever she chooses. Usually when making Mochi (her favourite treat! Moon Cakes are close second ~)

Momo is also moon spirit, based off the old Japanese tale of a rabbit pounding mochi on the moon; though her design mostly resembles that of the Japanese tale, this legend is also well known in other asian cultures such as China's version where the rabbit creates Moon Cakes instead of Mochi! I urge you to look up both of these versions as they are both lovely stories.
(Also go watch "Over the Moon"! It's an adorable animated film based on the chinese version of this story.)

Momoko's design is also a shout out to one of my all time favourite games, Okami and "Yumigami" the Celestial Brush god of, well...the Moon. Go figure.