Here is Sitatori's updated ref sheet with background included.

Art ©  unyko

She is mated to Caelestis.

Sitatori is a name I created. Ori means "my light" and Sita comes from Sitara, which means "star." The t was added for pronunciation. So, sounds like "Sitatori" means "my starlight." :3

Her glow is usually (but not always) visible, and can be affected by emotion, her will, and surroundings.