Sisters

Ashley and Isela are sisters. Ashley went on to be the best, strongest officer in the station security, rising to the rank of Captain, while Isela joined the toughest gang in the underground of the station, and became the gang leader by using violence and doing shady deals.

Both are well known on the station, and everyone sees them as complete opposites. The good sister and the evil one, both rising in power through their converse communities. But secretly they know that they are in fact the perfect pair, and are only complete together.

The best part of their day is when they're able to leave their worries behind and meet up for a chat on the upper level, and open up like they can't with any of their subordinates, like only sisters can.