Not every enemy will be recruitable, but yes, the general idea is that they will provide a small benefit while staying at your safe house (so long as you can put up with them and the requests they ask of you). Naturally, there will be new scenes as well for the recruitable characters.
Viewing post in Recruitable Enemies and Other Stuff (Questions)
What about the bosses? I'm not expecting to see every boss to be recruitable like some of the lesser enemies but if some of them are will they play a major role for the protagonist?, Will we be able to build a unique romantic relationship with them?, and will we have the option to build a harem squad if we want to if it helps us in our journey?
I do hope we'll able see the previous bosses again and their interactions with the protagonist especially with Liquidator. (she's my favorite)