Hot Toys seems to be dabbling into Japanese stuff lately with Kamen Rider. Maybe too niche of a market? I’m really surprised no one has done classics like Sailor Moon or DBZ in 1/6.
Something like Genesis Climber Mospeada is going to have cross over appeal to collectors of other lines. This kind of concept is extremely marketable. Basically a marine, power armor, weapons, mecha, etc, etc. Then there's the legacy Robotech fanbase that comes with it. If kids didn't grow up with it here in America, then there's no nostalgia value at all to help drive interest. For example, many kids grew up with Power Rangers, so Pudgy Pig brings back good memories for them. But as a raw figure concept otherwise, it would be a hard sell outside of it's invested legacy niche.
Something like Dougram and/or Gasaraki, those kind of themes, IMHO would sell if it was a more traditional anime human character paired with a mecha of some kind. Transformers is a legacy merchandising juggernaut because it has real nostalgia value, it will have cross over appeal to vehicle/car/plane/motorcycle collectors, it will appeal to mecha collectors, it has some light military themes within it ( the Autobots and Deceptions are in a perpetual war)
Without that nostalgia frame of reference, then you are relying almost completely on concept. I can functionally market something like Mospeada to folks who have no idea about it's origins or background, but I'd find it close to impossible to do something like that for something, for example, like My Hero Academia.
It's just infinitely easier, if we are talking toys and action figures, to support soldiers, warriors, Vikings, knights, police officers, etc, etc as raw concepts. So I'd say it's safer for anime figures to stay in the 1/12th realm than try to encroach on 1/6th. Consider Alfred from Batman. I was happy for Batman collectors when Hot Toys made an Alfred. But he had to be packaged in a set, as a chase item in a larger concept. I see the majority of anime figure concepts the same way.
The one possible non combat related theme I can see working is something like Apexplorers, just compressed for what would be more classic anime human characters. Essentially a version of an "Adventure Team" concept. So something like Planetes, or the concepts within it would be more aligned to appealing to a larger base of overall collectors. Just some thoughts.