"Nyx is the Greek goddess (or personification) of the night. A shadowy figure, Nyx stood at or near the beginning of creation and mothered other personified deities such as Hypnos (Sleep) and Thanatos (Death), with Erebus (Darkness)." ~ Wikipedia
A while ago on my Danny Phantom discord server we were talking about gods and goddesses in mythology, which included the Geek legends we actually did see in Danny Phantom such as Pandora, Cerberus, and Medusa. And I dunno it got me thinking about Nocturne for some reason so I wanted to design a ghost with a similar look. She looks a lot like my random oc Midnight too but what can I say? I love using blues, purples, and black together! So long story short I decided to combine both ideas to draw a version of Nyx as an ancient spirit and possibly the creator of Clockwork (Death) and Nocturne (Sleep) and is the wife of an unknown Darkness-themed ghost.
Now, as for Nyx as a character her domain is in the darkest reaches of the Ghost Zone where the silence is almost deafening which she prefers. Wherever she steps bursts into a harmless white flame and she sings lullabies in the darkness to the wayward souls that wander deep enough into this part of the Ghost Zone searching for peace and quiet. Clockwork's Tower is closest to where she resides and when not observing the timeline he seeks her council which he deeply respects. Nyx knows he has a mischievous side but cares for her creation like any mother would. Nocturne on the other hand is quite literally a black sheep of sorts and in her mind has gone astray actively trapping mortals in a dreamworld to harness their energy which deeply saddens her truth be told. As for her husband, a ghost that embodies darkness itself, he guards the entrance to the Unworld which is a true void in the Ghost Zone where human advantages and ghost powers don't work. He uses shadowmancy to speak to her through the shadow she casts so Nyx never feels lonely. So all in all, she is content and as I said enjoys singing to herself and conversing with Clockwork and her husband.