Used to do aikido. Was fun and all, Idk why I stopped going, maybe I'll go back someday. I was only a white belt (6th kyu), mostly because I didn't like the graduation exams. And also, or aikido had belts like this (lowest first):
8th kyu (white belt, only for juniors)
7th kyu (white belt, only for juniors)
6th kyu (white belt, first adult belt)
5th kyu (white belt)
4th kyu (white belt)
3rd kyu (white or brown belt, own choice +hakama)
2nd kyu (white or brown belt, own choice +hakama)
1st kyu (white or brown belt, own choice +hakama)
1st dan (black belt +hakama)
2nd dan (black belt +hakama)
3rd dan (black belt + hakama)
4th dan (black belt + hakama, the last belt you can graduate normally)
5th dan and up: You have to get invited to the exam and pass. Basically 5th dan and up needs to be really really really skilled and have done a lot work for aikido. black belt and hakama.