Milky is a female chihuahua Jewelpet who represents the gemstone sympathy. She has pale blue fur with pink inner ears and chest fluff, and her jewel eyes are made of green milky quartz. She wears a light green bow around her neck and a light green frilly cap on her head.

Her personality is defined by timidity and nervousness; she is known as the most fearful of the Jewelpets and can be cowardly in many situations. She speaks with a Tohoku dialect and habitually ends her sentences with "desu." Despite her anxious nature, she has a fondness for cute and pretty things.

Milky first appears in episode 13 of Jewelpet Sunshine. She is one of the co-owners of the Strawberry Cafe, a business that operates in both Jewel Land and the human world, running it alongside her friends Peridot and Luna. Her role in the story is that of a supporting character, often seen in the background or helping out at the cafe rather than driving the main plot.

Her primary relationships are with Peridot and Luna, who work together with her at the cafe. Beyond this, her interactions with other characters are limited and she does not undergo significant personal development over the course of the series. As a Jewelpet, she likely possesses magical abilities related to her gemstone, but specific powers are not prominently featured in the Sunshine season. Her timid demeanor does not evolve into boldness, and she remains a gentle, easily frightened presence throughout her appearances.