Newt and Rosalind were both outsiders to New York.
But the slight difference is that Newt comes from beyond the ocean, while Rosalind comes from beyond time and space.
Magizoologist & Spacetime Artifact Master
The design of the heroine is based on Kaladesh in "Magic: Showdown". It doesn't matter if you haven't played it. Just understand that the heroine has traveled through another time and space.