I can't remember anything about the characters except they were all the same person of a different universe, with variations of the same name, who were the only ones who could hop between universes. They're fighting a war for the worlds to free them from both sides, one coming from the more science-y worlds, and the other from the more magical worlds. The only thing both enemies had in common was they powered their world hopping transportation from the people who could plane-jump.
Perhaps the novella "Ariel" by Lucius Shepard published in Asimov's?
A Short description (excerpt below) can be found at the Wiki site: http://english.turkcebilgi.com/Spring+Heeled+Jack
The first half of the full novella can be found at: http://www.asimovs.com/_issue_0311/Ariel.shtml
In the novella "Ariel" by Lucius Shepard (published in Asimov's Science Fiction), Shepard uses Springheel Jack as the basis for his story about male and female travelers in the multiverse postulated by some versions of quantum theory, who pursue each other in infinite variations across all universes. In one universe, the lovers resemble Springheel Jack, and invade our own universe.