I'm actually no good at fighting games either, but some of the fight scenes in RWBY just read so much like a cutscene from a fighting game that I can't unsee it. Something like a 3d fighting game like Soul caliber or Tekken. I can't really see RWBY being a tactics type game though, the action in the show is too high-flying and extreme for that kind of genre. It might work for a good story or set piece but idk how much of the essence of RWBY it would capture. I have not seen Grimm Eclipse, nor any other RWBY content outside Chibi and the main series (and that one RWBY book I read), but if you got a video on it send it my way. DMC type game might work but again that's a series I've not played yet so I can't speak on it too much. A beat em up might work, like with the Grimm as foes but like you said Grimm are a total non-threat.
I did not know about any of that! Considering the very limited amount I know about Japanese culture, what you said makes a ton of sense. Maybe RT might be black listed but what about, uhhh Viz I think? They're the ones who bought RT right? Whichever company it was.