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

Rei, here, is the Master of Illusion--whatever images she thinks up in her mind, she can use *outside* it!
With Lloyd's Energy power, she can make these illusions come to life... at the cost of her being extremely fatigued and unable to continue fighting.
Later on, she becomes more powerful, allowing her illusions to stay longer than a few seconds.
She's also Lloyd's twin sister, having been forced to chase after him when one of Darkley's graduates kidnaps him from his own home. Ends up becoming an Princess of Ninjago out of it, which *kind* of sucks...