I needed somebody who was magical for the strip, and since my focus relies pretty heavily on JLA and Avengers parodies, I decided on a Scarlet Witch / Zatanna. I don't have many plans for Conjuressa beyond a few funny gags in mind, but outfit aside, I like the look I came up with for her. I imagine her looking perpetually nervous and bewildered most of the time, like her grasp of what's real is slowly melting away. I think I was also ever-so-slightly influenced by Paul Kidby's take on the Discworld character Magrat.
The name Conjuressa I took from a minor villain character I used in the original RPG.
Conjuressa looks a bit too much like Scarlet Witch, I think. I added some nylon aspects to her outfit as an homage to Zatanna. I would have done fishnet, but that's a bitch to draw in Illustrator.
It's my understanding that Batman and Zatanna have / had a bit of thing. I think it might be ridiculously funny to pursue something alone those lines with Walters and Conjuressa, or more likely, to reveal that there was "something going on" between them in the past.
Kudos to Jason for coming up with an interesting origin for her, and for coming up with Sham'bala and the other mystic cities. Have you read his description of Carcass on the SSS? It's good stuff.