Goddess parring
Female twin of percy or Fem! Percy(Andromeda) goes through the movies/books than she goes back in time how ever long ago could be when Kronos eats his kids or when the twin archers are born really should depend on the parring or when you want to add her(she's under a curse so she can't speak of the future but she can make slight changes) by the time she gets back to the lightning thief she could be in the original movies/books where she is the only god original percy respects outright cause of the stories surrounding her of her being kind,caring,understanding,nonjudgemental(mothering) to all because of all she went through in her time both as a demigoddess and a goddess but she is still a really strong warrior so she is respected and feared by all(because of her demigod life she doesn't have any or only has them with people who need something to live for she must have a talk with her love interest so they know what's happening and know she isn't cheating if/when there together). Andromeda is the embodiment of don't judge a book by its cover and don't make the nice one mad? She could be a mother figure to all those the gods wronged or damned or were unwanted and depending on Andromeda's love interest if she has one character development where they try to get accepted by there adopted children so there forced to grow. Examples maybe Hestia is not forced but learns not to be so passive, Athena learns to be humble, Artemis and the hunt learn not all men are bad, Aphrodite could keep some aspects of her war time and not be so vain ect. Andromeda is the only goddess that can visit the camp's any time and can interact with the demigods so she is the honorary mom and the other goddesses don't mind that their children see her as such knowing that there safe and taken cared of and maybe the gods use her as a messenger behind Zeus's back.