@Count:
Assuming you are talking about the Eight Precepts, there are five more, not two.
I meant Expendables as in Overhaul being willing to abandon them, I didn't really include Mimic and Chrono because they don't give off the vibe of being as disposable as the ones we've seen so far. But you are right, aside from bug mask and black mask, there's still the big guy from the beginning, but I feel like he's not going to matter too much anytime soon seeing as he's busy with all these police men and heroes.
I also agree with you on Twice. He's been introduced as someone who didn't fit into society and became a criminal because of it, but there doesn't seem to be any really malicious, straight-up evil intentions behind his actions, he's more like someone who's just lost and in conflict with himself.
Hori in general doesn't seem to be opposed to the idea of his villains not being complete scumbags, at least some of them. Tomura's tragic backstory has yet to be told, and we've seen hints of that in Magne as well, also some of the goons we saw just a while ago. There's not a lot to go by as the villains are still a little underdeveloped, but there's potential for some good stuff here.