Cerebus' wife from Latter Days. She looks exactly like Jaka and is the audience that Cerebus is telling the story of Latter Days to. She had arrived to interview him for her magazine, "Friends of YoohWhoo".
She is the mother of Shep Shep, and creates a competing church which extols the value of feminism (through Sim's eyes), with horrifying results. Experiments with genetic cross-breeding with the intent of establishing a dynasty for herself and Shep-Shep in Egypt.
Lenny: New Joanne looks like Jaka. Is this just a coincidence? Is it Yoohwoo working to get Cerebus? Why didn't Cerebus keep New Joanne's resemblance to and the existence of Jaka a secret?
DAVE: As I said earlier, New Joanne was just the latest failure in Cerebus' repeated failure of the `Jaka Test'. Cerebus kept New Joanne's resemblance to Jaka a secret, largely because he knew there was something intrinsically shameful in falling in love with someone just because she looked like Jaka. Which there is—although he couldn't see that. It takes the fundamental stupidity of willfully not seeing Jaka as she is and kicks it up into a whole different quantum level of stupidity.