So I came up with this weird idea that Altair, Ezio, Connor, and Desmond are on a talent show, whose judge panel is filled with Templars like Robert de Sable, Cesare Borgia, Haytham and Vidic. Then the contestants have their own managers, like Malik is Altair's, Leonardo is Ezio's, Achilles is Connor's, then Shaun is Desmond's.
Just throw in the usual talent show drama and go crazy!
Prefer pairing: Hay/Con