Light-talent

Light-talent fairies are very skilled at light. They glow brighter than any other fairy (perhaps aside from dust-talent fairies). They can manipulate and move light for various purposes, including moving sunbeams and giving fireflies their glow. Light fairies are quick-witted and literally "bright" fairies. They are perfectionists who love to be in the spotlight. Another special skill these fairies have is the ability to create rainbows. They also have the ability to create and manipulate fire and look directly into the sun without damaging their eyes. According to some stories, humans who've seen light fairies on the horizon have often mistaken them for flashes of lightning.

Clothing
Some fairies wore yellow, blue, green, or pink, since that is the colors of light, like the Northern lights. Yellow is common, it represents the sun and light, while some wore shade of light orange as their top or second layer of the skirt. Blue may represent the moon, moonlight, or lunatic beam. This actually refers on their names, like Luna, because her name is the moon, she wore blue. Fira wore pink and Helios wore green, which may represent the northern lights. This may also be a rainbow, since it was pink, yellow, green, and blue and when you layer it top by top it will form a rainbow like colors.