so there's this kid who's lost his memories, a guy finds him. the kid doesn't actually have a gender and sometimes changes into a girl. this girl and two other kids that looks exactly like her are from the moon i think. i think tey references them as mermaids or something.
out of the three kids only this one can give birth. the other one is too weak and the third one just doesnt have the ability to.
the first kid's name is jimmy i think.
the guy that finds the first kid does some kind of theatre work.
i also remember that later in the story the third one dies to save the second one but is then reborn into the body of a 20 ish year old millionaire.
the first one becomes human and gets married to the guy who found her and the second one falls in love with the first one's fiance and they procreate. the guy dies and then the second one dies later.
i think there's more info but cant think of any right now.

Moon Child

Yeaaaah, mermaids from space. :3

I hated that series...yeah, that desciption fits Moon Child