Harlan Ellison. The only way the series can be redeemed is if all the characters are tormented to the brink of despair while I get to watch.
Serious answer: KJ Parker. Massive history and lowtech sperg, can torment characters and fuck fans over like no one else, still alive.Just the cheapest hack they can find. I’ve always liked the idea of ending an epic fantasy series with a final volume that’s just a total “fuck you” to the fans. Something like they’re about to get to the climax of the series and then Jon Snow wakes up and it was all a dream.