I actually have an Ninjago OC!
...Six of them!
...and four of them are Garmakids! Whoot!

Spectra, the Second in the Garmadon family line, i the Master of the Undead--able to resurrect dead warriors and ghosts, and use ghostly powers as a result.
She's the one that's able to cancel Lloyd and Rei when they tag-team, destroying illusions with her ghostly powers.
Spectra was accidentally forced into the Underworld when Lloyd was taken from home, her fears of the situation becoming too great and she needed an OUT. When she came to, Spectra was brought to her outcasted father--Lord Garmadon, where he taught her how to better channel her powers and be able to leave whenever she wished.
Hoever, her powers aren't well-liked in Ninjago, and Spectra yearns that someone sees her for, well, her.