Long John Silver

 took the Sixth Doctor and companions to the Mistress's citadel in the Land of Fiction. (AUDIO: Legend of the Cybermen)

Kenneth LeBlanc compared Josh Carter to Long John Silver's parrot, always being at his shoulder. (AUDIO: Silent Majority)

In circa 2000000, Ace compared Lefty Lonnigan to Long John Silver as he was a cyborg. (AUDIO: A Life of Crime)

The Thirteenth Doctor described as a cross between Long John Silver, Shere Khan, Smaug, and the Red Queen. Missy later mentioned that the actual Long John Silver was one of the characters she had defeated in order to take over the Land of Fiction. (PROSE: The Wonderful Doctor of Oz)

Behind the scenes
Tom Baker has played Long John Silver twice, once on stage and once for Big Finish Productions. The role has also been played by Brian Blessed and Peter Jeffrey.