"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.