Gwynn is an underrated character in the Sluggy Freelance
universe. It was all too easy to write her off as a psycho bitch
when she was trying desperately to win back Riff
through any means necessary. But let us not forget that she was generally under the influence of K'Z'K
when doing things like making the love potion of doom.
She never got much credit for her strength and courage in resisting, and ultimately overcoming, K'Z'K. She came back to a world where Riff had another girlfriend, she had no job and nowhere to live, and now she's a clerical slave to Aylee and isolated from her friends again. Gwynn cannot win, it seems.
Because of her near-continual solitude, her bespectacled appearance, and her fling with the occult, I suspect strongly that Pete must have had been influenced - perhaps even just subconsciously - by Thessaly of The Sandman.