Who was the character that George R. R. Martin regrets killing (in the ASOIAF universe)?

Prediction market on manifold. In 2017, Diana Gabaldon, an author and friend of the writer George R. R. Martin, described a conversation with Martin where he mentioned that one reason he was struggling with to write The Winds of Winter (the long-awaited sixth instalment of his A Song of Ice and Fire series of fantasy novels) was that there was a character that he later regretted killing, saying ‘You ever kill somebody off that you later realised you needed?’ https://old.reddit.com/r/asoiaf/comments/8rumol/spoiler_main_diana_gabaldon_author_of_outlander/?embed_host_url=https%3A%2F%2Fwikiofthrones.com%2Fgeorge-r-r-martin-delay-the-winds-of-winter-killed-important-character) Since then, fans of the series have speculated about who this character might be, and have put forward numerous theories: https://old.reddit.com/r/asoiaf/comments/9kcxxs/spoilers_extended_who_was_the_character_that_grrm/ https://old.reddit.com/r/asoiaf/comments/1azzixi/spoilers_extended_who_was_the_character_martin/ https://www.youtube.com/watch?v=10Yr0JHyROQ This market resolves to the identity of that character, if it is ever revealed by Martin (it will resolve N/A after Martin's death if it looks like we will never know the answer). I've added some popular theories, but anyone can add a character.

24h Volume: $307.457. Liquidity: $1,500. Resolves: 1/1/2040.