Here are three great channels with a lot of Japanese content to enjoy on your Roku!
1. Crunchyroll has a great show Culture Japan on it. They also have popular Japanese Anime shows as well.
2. For a lot of great Kung Fu classics, add this Roku Channel.
3. For News the NHK World Japan is another great Roku channel to add.
And for another great show, with Japanese Karate, watch all three seasons of Cobra Kai on Netflix.
To find many more great channels to add to your Roku, check out this list!