Merlin and Arthur

The relationship between Merlin, and his master, Arthur, has progressively formed and developed over the course of time into a very brotherly, close bond. They, according to divine prophecy, share an interlaced destiny, both being opposites of the same coin. After saving Arthur from getting killed, Uther thought it merited something very special and appointed Merlin his manservant. While, though, at first their connection was tarty, they were both very quick to sacrifice themselves for the other (The Poisoned Chalice and The Labyrinth of Gedref). Arthur shows just how deeply he cares for Merlin by frequently teasing and joshing him and gets great enjoyment by hassling and overloading him with work, but deep down, cares for him very much.

Trivia

 * Bradley James says in an interview that his character Arthur's connection with Merlin is stronger than his love for Gwen.