^wasn't Reed supposed to be her sister's body double?
Based on her files/voice lines, she used to be a remarkable combat unit and fought at least once with bagpipe. She was most likely left for dead in ruins when RI found her.
Her sister might be alive and extremely powerful (trust line 3) and Siege may or may not know who she is.
^ a pretty old picture (for internet anyway) of a couple and some dude in the exact same position. It has been parodied several times and there is at least a Ophelia x Soleil one here.
^Most operators (Playable characters) in Arknights have a Codename based on their race/subrace/powers. Warfarin here is a medic from what's basically a vampire subrace, hence the name.
^ There is actually a bit more to it:
Franka is infected and joined Rhodes Island for treatment. Liskarm basically followed her by requesting a transfer for joint operations stuff.
In the game it's displayed as strong loyalty/partnership but we all know it takes way less for fans to make a ship sail.