 Each lightsaber is unique, though some may bear resemblance to others, especially if there is a connection between the builders.The first film appearance of a dual-bladed lightsaber (first depicted in the comic series "Tales of the Jedi") was in "The Phantom Menace", wielded by Darth Maul.Being two merged regular lightsabers, the blades are independent of each other and one can be turned on without the other, or can be split into dual lightsabers.