I'm the author of Prince of Thorns, King of Thorns, Emperor of Thorns, & Prince of Fools - spare ideas land here.
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You could put Teresa Frohock where Hobb is and move Hobb a little to the left (Teresa is much more horror oriented than Hobb, I think Kate Elliott could be just below Martin and above Rothfuss. right and below her, you can put Martha Wells Around the Sanderson zone, you could put Judith Tarr Juliet McKenna should be above Pratchett and below Abercrombie...
I can think of several female authors who fall into several categories, but the categories don't overlap properly.For example, Ellen Kushner fits into Lovers, Killers, and probably Jokers, but the only place where those three overlap also includes Soldiers, which doesn't fit. Seanan McGuire fits in Lovers, Jokers, Thrillers, and Killers, but those four only overlap in the middle.
In the downward facing arrow beneath GRRM, Lois McMaster Bujold. Between the 5 God's universe and the Sharing Knife, plus The Spirit Ring, she fits.
I personally know Myke Cole. He's a cool guy.
Amanda Downum: thrillers and horrors. Jacqueline Carey: lovers, thrillers, horrors
Ursula K. Le Guin - Builders.
For female authors, Kameron Hurley could fit into Killers/Soldiers (missing Lovers but that would only be possible with Jokers)
This is one of the coolest Venn diagrams I have seen. Yes, it can be nit-picked about simplifying things, but that is what a Venn is for. And I generally agree with these groupings, as I follow about 3/4 of these authors. Nice to see I like variety! And interesting that the so called "Grimdark" authors fall over the diagram.
I feel somewhat doubtful about the jokers part of this diagram, I wouldn't classify any of these other than Pratchett as being funny. For jokers, I would suggest Brust, Piers Anthony, Robert Asprin, Diana Wynn Jones. I don't see how any of them overlaps with either soldiers or lovers though. It's a puzzle.
For the Soldier/Joker/Lover/Builder set I'd suggest Mark Gentle with Grunts! White Crow, Ash et al fitting into those segments nicely.