the first ocean princess is from another world.

Ellie Tomson is a British mythologist of 32 years old, she had been studying greek mythology with her team for a few years now and had even deciphered multiple relics, Ellie knew everything about said mythology.
she also liked reading fantasy books, so it's no wonder that she has the Percy Jackson books memorised.
one day while walking to the ancient greek museum where she worked she got pulled into a terrorist attack, in which she got killed.
for a while, there was nothing but darkness, but suddenly noise and light started to fill Ellies senses, and so, lapis Perseus Jackson was born.

warning I do not own the Percy Jackson series nor do I claim to, this will also be only based on said series.
some of the stuff I say here may also not be part of Greek mythology and for that, I apologise.
there may also be romantic or sexual themes later on (not extreme amounts though) cussing, gore, abuse, angst and more triggering stuff.