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  ===Casting===
  Richard Dormer (''pictured'') and Paul Kaye returned to the series as Beric Dondarrion and Thoros of Myr, respectively.
  "No One" saw the reintroduction of Richard Dormer and Paul Kaye, who portrayed Beric Dondarrion and Thoros of Myr, respectively, in the third season, last appearing in the episode "The Bear and the Maiden Fair", before returning for the sixth season. Dormer was previously asked about returning to ''Game of Thrones'' in an interview in February 2015, saying at the time that he was doubtful about coming back to the series, stating "they haven't told me about it, so I don't think so." He also noted about his portrayal of the character, "Beric was a noble character, a leader of men. Kind of like Robin Hood. So I thought, that's how I'll play the guy." Paul Kaye's participation in the series was confirmed in mid-April 2016, with his agency posting about the casting shortly before the premiere of the sixth season.
  The episode also featured the deaths of several recurring characters in the series. Faye Marsay, who portrayed the Waif, spoke about her participation in the episode, and leaving ''Game of Thrones'' after several seasons, saying "As much as I'm sad that I'm now off of the show, I think that storyline needed to be concluded that way. I'm rooting for Arya and Maisie as well. Even though I won't be able to hang out with everyone again, I think it was done right and done properly. I think Arya deserved to rip off her face and stick it on a wall." Recurring guest actors Clive Russell as Blackfish, and Essie Davis as Lady Crane portrayed their characters for the last time in the series, as they were killed off on screen.
  In the first scene featuring Sandor "the Hound" Clegane, comedian Steve Love was cast as one of the Brotherhood members killed by the Hound. Love previously had become known for his impressions of various ''Game of Thrones'' characters, uploading the video to YouTube, which ultimately resulted in his appearing on ''Jimmy Kimmel Live!''. Following the appearance, Love stated that he had received an email from Benioff offering him a part in the show, saying "I broached the subject by sending them an email back saying 'Listen I don't know what your plans are for me but it would really mean a lot to me if I could have one of those trademark ''Game of Thrones'' gruesome death scenes, and they wrote back saying 'Actually Steve, that was exactly what we had in mind for you.'"