You and your sisters Chibiusa and Kousagi were mermaids. You three were born in the sea, always swimming around and exploring places. You guys were always observing humans, and you guys always hang at Mako Island, where you guys would spend time together at in the Moon Pool, it was practically your home. You guys wear a shell bra, a fish tail, tiaras, and jewelry.

(You can be a mermaid or a siren. And to add drama, there's a pick me girl named Sofia and you'll meet her later)