What might point to someone with a Jekyll & Hyde personality?

This topic was created in the Astrology forum by Radar on Friday, February 1, 2019 and has 2 replies.
Outside of obvious gemini placements in the natal. Someone who can be the calmest, kindest, most pacifistic person you know but also have a split personality as like a street fighter or serious delinquent and you'd never know.
A bar in their living room.