Lightning [Elements I]

I was someone from another Realm, one that no one could find the name of. I mysteriously appeared within Ninjago as a child, and I was saved from certain death by someone named Wu. He raised me like his own, and soon made me a student of his teachings alongside a few others.
For years, though, it was just Wu and me. Soon, Wu brings home the first of four soon-to-be ninja, the first of four my father believes will rise to protect the Green Ninja. Wu entrusts me to help the four eventually reach their True Potentials and protect the fate of Ninjago.
I accept the challenge, though it becomes problematic when the newcomers all begin to fall in love with me.
["reboot" of "the one from elsewhere"]