The Day Queen is one of the two official queens of the Rainbow Kingdom, responsible for bringing daylight to the Kingdom on a daily basis. She is the sister of the Night Queen, whose purpose is to raise the moon when it is nighttime.
The Day Queen, like the Night Queen, originally believed that the daytime is the best time (and later went on to sing a song about it), and would try to change her sister's outlook on it. Her sister had parallel viewpoints, but they still got along as they share sisterly love despite their sibling rivalry. They are only able to see each other at dusk and dawn when it is time to raise or lower the sun, and as a result, in "Queens of the Day and Night", they stuck the sun and the moon together so they could spend more time with each other. After realizing that the Kingdom can't function properly their way, with help from True and her Wishes, they split the sun and moon again, and were given Face Bubble sashes so they could speak to each other any time they want, even if they weren't physically with each other.
The Day Queen is white in color, like the Rainbow King. She has two blush marks on her face. She wears a golden sun-shaped headdress and an orange and gold dress with an orange cape. She is always floating or flying, and carries a golden scepter.
It is currently unknown what her and her sister's exact relation to the Rainbow King is.