The necromancer and the black holes.
Background spirit:

“Only its upper body is floating”
Appearance:

Top: “The horns are a hair accessory, a cursed item.”
Bottom: “The collar looks like she’s being possessed”
Back:

“What looks like wings on her back is a cape”
Cosmostar the White Hole Polairy
Full art:

Left: “Milky Way raiment”
Right: “If one looks at the Milky Way galaxy from the side, it looks just like an alternative color for a black hole”
Cosmostar the Black Hole Polairy
Full art:

Wings:

“Wings spreading wide open”
Skirt:

“The inner side of the skirt is a black hole
Effect of light being distorted”
Stirrer:

“The stirrer used in “Princess Cosmos Stirs”. (Lent it to The Princess after she kept pleading for it)”


2 Comments
It was thanks to this Concept Art for Legend Necromancer that I realized that the ribbons around her neck literally give the appearance of ghostly hands.
And well, although the Concept Art says she’s not possessed, she actually has an evil spirit attached to her (which appears to be linked to her cursed horns)
P.S: There is Concept Art for Princess Cosmos the Cosmic Trickster that hasn’t been published here.
Thank you for pointing it out. I did miss it, and will be working on it soon.