Thank's for the input. The list so far (in no particular order):
Japanese senseis:
Arisou Takao Sensei 7th. dan
Shishiya Ichiro Sensei 7th dan
Suzuki Shigeru sensei from Matsuyama 8th. dan (I think)
Koji Yoshida Sensei, 7th dan
Yasuhiko Takemori Sensei, 7th Dan
Seiwakai - Koichi Shibata 7th dan
Masakazu Tazaki, 6th dan aikido, 6th dan aiki toho
Kouchi Tanaka
Hattori Takao Sensei - Aikido 7th dan / 7th dan
Shibata Koichi Sensei 7th dan
Kitamura Shihan 7th dan
Some of the non-japanese:
Michael Russ
Stephi Varjan
Stefan Stenudd
Mark Jewkes
Knut Högvall
Jean Michel
Remi Delcos
Jan Max Bunzel
Kim Mortensen
Jarkko Lapinlampi
Jiri Marek from
Paul Mueller
R Jun Batumbalani (aka L Jun Mateo) 6th Dan / 3rd Dan
Please feel free to elaborate the list. Some of the people above I don't know, but I expect that you all only mention them, if they teach only or primarily inspired by Nishio sensei (or it would sort of ruin the point of the list
)