Okay. After a few days of plotting- and realizing that the Wild Experimenter is 3PP, and not really valid as an option- I've settled on an Anti-magic focused Spellscar Oracle with the Haunted curse.
The plan is for Rylle to be a chipper girl, in her early to mid twenties,whose magic is wild and untamed. It even influences her in her daily life, like a ghostly presence that is never far from her side. Of course, never knowing what element you're conjuring can be a bit of a hassle, and the primal magic events that pop up around her can be problematic- so, she has dedicated her life to learning how to control those spells, or even negate them entirely. She figures that, if she can't shape the Primal energies, she can at least try to quell them.
Which, of course, is why she came to the Shrine.
She doesn't know precisely what it is, of course. But she has heard that there was some powerful, ancient magic that could change her. Maybe, she figures, the shrine can help her to assert more control over her own magicks...