Subject: The age changes things, actually.
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Posted on: 2015-10-21 18:05:00 UTC
Harry's what, fifty-some? Older? And he had Training From Hell, too.
Even if your character matches Harry Dresden in raw power, she's got less than half the experience. She'd be closer to Molly Carpenter than Dresden. Pre-Changes Molly, even.
She wouldn't have advantages like Bob (for knowledge), Mouse (as an early-warning system), the Nevernever (for escape/travel), or even a convenient model of Chicago. She also wouldn't be able to control her magic very well; remember how hard it was for Molly to learn control?
Your character would be like a sixteen-year-old with a new driver's license, behind the wheel of an elite race car. She has the power, but not the knowledge or the experience, and unlike a Sue, she has to gain them the hard way. She'd do the magical equivalent of poking along at 10 mph and stalling out because she couldn't figure out the manual transmission--sure, the potential's there, but right now, that's all it is, and it might even be a drawback because powerful magic is harder to handle than weaker, just like that race car is harder to learn to drive on than a poky Honda Civic with an automatic transmission.
I do wonder how a Dresdenverse wizard would develop their talents at high-tech HQ, without access to many other Dresdenverse magical practitioners (and thus not to very much relevant knowledge), but with access to the knowledge of a thousand worlds, all with different rules. I think such a person would eventually begin to develop a theory of the multiverse and the rules of Plot.