Sailor Moon Edit #2:

Emica Mangetsu/Princess Destiny (OC)

Emica/Charm is Usagi/Serena's best friend and soul sister (meaning that she was Serenity's sister). Emica/Charm in her and Usagi/Serena's past life was Serenity's older twin sister and Crown Princess to the Moon Throne.

The two girls, in both lives, were born on eclipse's. Emica/Charm born during the eclipse and Usagi/Serena an hour after, after the eclipse has passed.