The One From Elsewhere

Once upon a time, the people of Maegearica and Ninjago were friends. One day, a rumour was spread, and the two sides were locked into a war.
Then a great, cataclysmic event split the two sides forever, and a new Realm was born meant to trap the people of Maegearica.
You are (Y/n), and you are a Maegearican that mysteriously appeared in Ninjago. You were taken in by Wu as a child, and you've since learned the ways of combat.
Years later, Wu brings home the first of four soon-to-be-ninja, the first of the four that may become the Green Ninja. Wu entrusts you in helping the four ninja reach their true potentials and protect Ninjago.
However, it certainly becomes difficult when they begin to fall in love with you.