As I start writing and posting again, while I have my own strong characters, there are many characters of other authors, to say nothing else, that I'd like to invite in what may be no more than a fictional social event -- orgies, of course, not excluded.
Given that gourmet themes run through my work, I can easily picture Winter Jennings and her household experimenting, in the kitchen, with mine, or being served. Their cats should meet mine.
For physical fitness, Millie 90lbs immediately comes to mind.
I do have some professional background in strategy and intelligence, and would enjoy brainstorming with QM's Mage crew (even though I do not have the Talent), or with the Lion of Terra and his staff.
Of course, images of pure lust come to mind as well, but there are interesting aspects of characters other than that.