Warlock, Summoner, Occultist and Artist.
She grew up wanting to be an artist and a fashion designer, and somehow ended up deeply fascinated by the esoteric, the profane and the occult. Marciella discovered a natural talent for thaumaturgy and rites, and such knowledge came to her as her curios nature got the better of her. Marciella took to the art of alien, inter-dimensional entities and both found them excellent company and grew into a natural competency with it. Most mages use flashy, powerful spells, which she universally sucks at. Rituals, however? Long, drawn out and full of meticulous detail and artistry and requiring a way with words?
That's her element.
Marciella never really lost her taste for fashion, given she can range from huge baggy fall attire to goth lolita as her whims change. Always making a statement with it, and always with accessories. She usually finds an excuse to wear black converse though, no matter the outfit.
She loves demons, angels, and anything that will make deals or bargains, but she never limits herself in general and never will with the occult either. Anything sufficiently non-human catches her eyes, related to her primary skillset or otherwise. It's probably telling that she gets more comfortable around monsters than people but don't call her out on that.
Her primary summoned demon is
Esenael who does an excellent job as a bodyguard, a guide and enact her desires as an observer to the towering demon swallowing people whole.