Planar Champion

"Warrior of a hundred worlds. Mercenary captain of the Blood Wars. Sword of celestial vengeance. The planar champion moves between the planes, always driven to battle. She may be driven by a quest for justice or a thirst for blood, but she is feared throughout the known universes for her prowess."
D&D 3rd Ed. "Manual of Planes"

Imagine a Time Master but for alternate realities and multiverses. You get someone with the ultimate sense of Walking the Earth, But Now I Must Go, and even The Homeward Journey where the person's wanderlust or adventurous nature doesn't just take them across the world but beyond and between worlds. There is an increased impressiveness when a hero's traits are adapted for not just one grand frontier, but billions of them. These individuals may sometimes find themselves facing their counterpart in a Multiversal Conqueror.

Examples:

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     Anime & Manga 
  • The Digidestined/Digimon Tamers in the Digimon series.

     Comic Books 

     Fan Works 

     Literature 
  • Roland Deschain The Dark Tower)
  • The Chronicles of Amber: Corwin (and possibly Benedict) of Amber.
  • Imajica: John Furie Zacharias
  • His Dark Materials: Will Parry
  • Pretty much every heroic Michael Moorcock character. Elric of Melnibone is the most famous but almost all his characters roam the Multiverse. He may even be the Trope Codifier.
  • All of The Homeward Bounders, but especially Jamie.
  • Joey Harker and all his alternate selves from Interworld.
  • The Cosmere is divided into multiple worlds, created and ruled by the holders of shards of a dead god. Each world has its own series, and Hoid has shown up in nearly all of them. It's unclear exactly what his agenda is, but we do know that he's very old, very powerful, and usually aids the heroes from the shadows.

     Live Action TV 

     Tabletop Games 
  • Pretty much any PC in the Planescape campaign setting, which takes place at the nexus of different planes of reality and revolves around jumping between them.
  • Magic: The Gathering: Planeswalkers have the ability to navigate the Blind Eternities and jump between worlds. Since the planeswalker package includes incredible magical power, they usually find themselves at the center of whatever conflict is currently consuming the plane they land on - either as a champion or a Multiversal Conqueror. Special mention must go to Gideon Jura, who wears himself out on a cosmic Two-Timer Date when trying to deal with world-shattering crises on multiple planes at the same time.
  • Warhammer: Various notable greater daemons such as Ka'Bandha the Bloodthirster and The Skulltaker.

     Video Games 
  • Sora from Kingdom Hearts, though the cosmology of the World is sort of weird. Each little universe is separated into distinct worlds, and the World is the designation for the Multiverse.

     Webcomics 

     Web Original 
  • The open-source character Jenny Everywhere is sometimes one of these, having the ability to shift between universes (and shift objects between universes, and mentally link up with alternate versions of herself).

     Western Animation 

http://tvtropes.org/pmwiki/pmwiki.php/Main/PlanarChampion