Overall the door is open for more Doctor Po content, if we didn't kill her I'm 100% sure she will continue with her work. Based on her information valid candidates would be people that have quite a debt, pirates or people that just go there out of curiosity (non-buyers).
Characters that could be easily attracted to Doctor Po place would be for example Kara and Shade, be it Kara because she discovers what happens there and while she hates pirates she wants to stop this or Shade by following a bounty that ended up there. Another character that could get there would be Sera if her debt becomes too high and she gets sold.
Personally I found that Kiro quest to be quite good, in fact it's the mission I liked the most in the game, overall the main difference she has compared ot doctor badger is that... she actually does her work haha.
I mean, Dr badger is always about trying to make all the universe into sluts but she will only do something when we directly go with something that interests her and modify it to make it into a bimbo. Overall I believe she just causes too few problems while Doctor Po just appeared and already did kidnap a friend of ours and will make her into a bimbo slave if we arrive too late. It feels like quite a difference I would say.