Yuune Yume's a Japanese angel who is permanently aged at 15 years old. She stands tall at 5'8" (173 cm) and weighs 125 lbs (56.5 kg). Her hair is short, with a gradient from brown to light blue, and her eyes are bright blue. When fully extended, her wings span 70 inches (178 cm). Yume wears a light blue Japanese button up sailor uniform with a red bow, paired with black detached sleeves and black boots with light blue accents.

Yume's cause of death is unknown, as she hates to talk about it, but she loves singing for the world. She's very shy, always scared of something, but when she sings her anxiety goes away. On her arm is 5•12, marking the day she died, May 12th.

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Despite this description, Yume's age, personality, and characteristics aren't canon, leaving the interpretation up to the user.