By the way, how does this sound?

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Nondimensional Entity.

Even though Flicker's body retains most of the traits and weaknesses of a human form, it is in reality made up of her own conscious will.  This is what allows her to manifest her abilitie(s) without major consiquince and slip between dimensional and non dimensional space, since her will only requires space itself to exist. She cannot however slip up into anything higher then the third dimension, since she still considers herself to be mostly human and as such she still has the perception and cognitive limits of one.