I don't really care for Kamen Rider as a franchise, but I love Momotaros -
Hip/ shoulder articulation - that's as far as it goes sideways.
The articulation is very similar to MU really. You get an interchangable mask which is the same as the one pictured only with painted red eyes, a cool sword, and a few extra hands. I'm a bit pissed he doesn't come with his trademark cup of coffee though.