BUR #20444 has been approved by @evazion.
create alias nippon_housou_kyoukai -> nhk_(broadcaster)
The tag for the Japanese NHK channel is currently tagged as "Nippon Housou Kyoukai", an official full name that is rarely used. I assumed this is because of NHK ni Youkoso! that intentionally named itself in reference to the NHK.
Given that NHK is far more recognizable than using its official name, and that it's more well-known than the aforementioned manga/anime, I think this tag should be turned into an alias for the NHK channel, in a similar manner to the BBC (broadcaster) tag. Especially since there are several NHK mascots tags on Danbooru already.