i would love his partner in crime, quite literally. he lost the love of his life 3 years ago and he really kicked his knack for murder up a couple of notches. i'd love for her to be someone he either apprenticed a long the way or something that he maybe was hired to kill and realized she was going to be a good killer as well and they decided to team up instead. there could be some feelings there, although we can play that out ig, and i'd be down for them having a bit of a fwb thing going on as well. it's possible he could even put in a good word for her to join the dauntless crew, since he knows their captain and he is high up at the company that owns the ship.