For the answer about shadow sprites, I will direct you to this post, one of the first ones I made for the shadow sprites. Shadow sprites, beings created by the Night Spirit, are often maligned in folklore. This is something that they share with the wraith sprites, despite appearances being very different.
Wraith sprites tend to be pale skinned, with any variety of hair and eye color (generally the colors are muted; nothing bright). They are flightless sprites, and make their homes in the hollow spaces of human dwellings more often than not. On their backs, instead of wings, they sport two sets of colored quills, that usually match the color of their hair. The quills can be relaxed or they can fan open.
When open, wraith quillwings are like psychic radio receptors, enabling the sprite to listen in on the surface thoughts of beings around them. This plays into the way their colonies usually interact with one another – secrets are few and conversations can pass silently.
I don’t have a lot of wraith sprite characters made yet, but one of the noteworthy ones is Teven Silver, who will be an important character in one of my upcoming stories.