We see them in Seattle, but not in the numbers that we see German stuff etc. I suspect that there is a difference if it's IJN or IJA; if it's IJA there are some really COOL color schemes to use. With IJN, you're a lot more limited. That's my personal bias, in any case.
On the other hand, for both IJN and IJA, you can really weather the hell out of them, including going nuts with a silver quilting pencil since they had such problems with their paint.
Another possibility is that there are relatively few Japanese pilots who are know to us Westerners, whereas there are a bunch of German, British, and American pilots whose names we'd recognize easily. Similar to the Japanese question, are we seeing the same issue with Italian and Soviet stuff? Because they also don't have a lot of "big name" pilots. Maybe some people get inspired by personalities too?
I don't know; I'm just speculating.
--Stephen