>>5975138Rather than tier, I can give a quick sum up off the top of my head.
>ChigiriKouzou: Yakuza rival leader that was surprisingly competent with his lackey and considerable threat. Since he was the only main antagonist, more room for him to interact with heroines and threaten them. I believed he was punched by Seiichi in the true route and died by snusnu in the adaptation.
Seiichi: Ryo's yakuza guardian that could have done a better job protecting the heroines in the first place. Would have liked to see a vanilla sex cg with Rio or Kyouko.
>Shirabe Kaizaki: False smile monk, as other anon said he is rather threatening due to his relation with three of the heroines. Anger raging boner on his crush's children and/or sister is impressively autistic.
Shou: Playboy VP from another school that surprisingly got away with so many backhand stuff. Nothing much more to say but would have been interesting to see him return or referenced back in Refrain other than his school.
Souta: Only exist for incest scene.
>KusariKohei: I nickname him not Reiner, basically focused on drug dealing and the raping of heroine was extra bonus.
Takeshi: Not Riner partner in crime, mostly used in Yui route so not much else to say. Could have shown more hate interaction outside the sex scenes.
Tadashi: Creepy teacher that has a lot of toys lying around.
>ShizukuShigeo: Basically Shou from Shirabe.
Tozawa: Mercenary that can actually kill (I think he and his partners threw Nonoka's manager overboard), so don't want to cross him especially since he and his partners can break into the girls' rooms.
>YugamiHonestly not much to say from the two antagonists, like they look incredibly generic among the rest. Funny enough they aren't working together so if you cross one of them, the other can still appear in the route but act as a neutral party.