Not alot is known about Rini. She is a mysterious child from the 30th century that fell out of the sky and landed on Serena and Darien in the park.
Rini and Serena don't get along very well, but that's because they are mother and daughter! When Serena becomes Queen Serenity in the future and Darien becomes King Endymion they have Rini, their only child and they send her to their past selves for training as a scout. And no one knows how they got a pink-haired kid from a blond and a brunette.
