the idea is that Lily Potter was the lost older sister to Mera. The guidelines are so
The timeline will be bumped up 20 years putting 18 year old harry at the end of the 2018 Aquaman movie
To explain why his Atlantean heritage didn't pop up in his fourth year is a combo of the horcruxes presence and Albus Dumbledores manipulation.
Harry must not be paired with a girl from Hogwarts [sorry but Harry/Ginny pairings sicken me. she tried to love potion him]
Harry starts fresh in America
and Harry has no desire to claim a higher standing in Atlantis
Other than that have fun and PM me when you post the first chapter.