20. Thoros of Myr

Red priest of the Lord of Light, noted warrior, leader of the Brotherhood Without Banners, and Beric Dondarrion's BFF/six-time life saver.

Time of death: Season 7, episode 6, "Beyond the Wall."

Cause of death: After surviving a zombie bear attack, he freezes to death during the stand-off against the White Walkers and the Wights. His body is later burned.

Sadness ranking: 7. He was a very minor character, but his death hit harder than expectd, despite the fact that it was a very expected death.