Milky is a pale blue Chihuahua with pink inner ears and a fluffy coat, sporting green Jewel Eyes. She's usually dressed in a light green bow and a matching frilly cap.
Milky first shows up in the original Jewelpet when Diana curses Keigo's potential bride Chie, turning her into a delinquent to unleash her repressed feelings. After that, Milky settles into a steadier role working at the Strawberry Café alongside Peridot and Luna.
In Twinkle, she's one of Halite's Jewelpets along with Luna and possibly Peridot. The trio actually makes a trip to the human world with Akari in one episode, and later she and Luna team up as commentators for the Jewel Star Grand Prix. By Kira Deco, she's switched gears entirely—she's running a sweet potato stand and apparently has some gift for predicting apocalypses, which is. niche.
In Happiness, she takes on a more protective role, looking after a large dragon that's been causing trouble around campus. She's convinced of his innocence and defends him fiercely. She appears occasionally in the other seasons but mostly stays in the background.
Content compiled by AnimeList.moe from publicly available sources.