(Okay, it just occurred to me - I can think of three major pairings involving a character with a single name: Kirk/Spock, Duncan/Methos, Arthur/Merlin. What's the fourth? It'd make a great recs set.)
Dean/Castiel is another one. Also, Aziraphale/Crowley.
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Dean/Castiel is another one. Also, Aziraphale/Crowley.