You...
Are a universe traveller. You started at the age of 8, falling through realities you stayed in for various amounts of time. You've seen nations rise and fall, superheroes win and lose, and aliens trying to destroy humanity for god's sake- But you had finally found a universe you didn't teleport out of. You were happy there, even if it was a bit unorthodox and chaotic.
As you were sorting through your room, the dreaded familiarity of the portal opening behind you.
Someone yelled your name and then you were falling through a portal.
You'd fallen into a new reality, right in the middle of a field- a farm?
You sat up and rubbed your head, looking around, when your eyes met shocked, gold-flecked brown ones.
"Who are you?" The girl asked, giving you a wary look, but a friendly, nervous smile.