Animators on pixiv
Finding Takeuchi's pixiv reminded me I wanted to do an animators list who are on pixiv.

Akio Takami (presumed) http://www.pixiv.net/member.php?id=2785500
Atsushi Saito http://www.pixiv.net/member.php?id=162487
Atsuya Uki http://www.pixiv.net/member.php?id=144600
Bahi JD http://www.pixiv.net/member.php?id=422430
Daisuke Hiramaki http://www.pixiv.net/member.php?id=50702
Daisuke Kikuchi http://www.pixiv.net/member.php?id=5303
Hiromi Ishigami http://www.pixiv.net/member.php?id=2328911
Hiromi Nakagawa http://www.pixiv.net/member.php?id=1239331
Hiroshi Yakou http://www.pixiv.net/member.php?id=1283095
Hiroyasu Ishida (tete) http://www.pixiv.net/member.php?id=56398
Hitomi Hasegawa http://www.pixiv.net/member.php?id=1447475
Jun Shibata http://www.pixiv.net/member.php?id=1036467
Ken Ootsuka http://www.pixiv.net/member.php?id=2036511
Kengo Saito http://www.pixiv.net/member.php?id=431706
Kouichi Kikuta (kou was a penname for his old doujinshi) http://www.pixiv.net/member.php?id=386382
Kouichi Motomura http://www.pixiv.net/member.php?id=139523
Mai Yoneyama http://www.pixiv.net/member.php?id=1554775
Maimu Matsushima http://www.pixiv.net/member.php?id=55651
Mamoru Yokota http://www.pixiv.net/member.php?id=667394
Masahiro Iwasaki (tarou2) http://www.pixiv.net/member.php?id=1410598
Masakazu Yamazaki http://www.pixiv.net/member.php?id=38741
mebae http://www.pixiv.net/member.php?id=43614
Naoki Yoshibe (yotube) http://www.pixiv.net/member.php?id=29866
Nobuhiro Nagata http://www.pixiv.net/member.php?id=3430996
Nishiki Itaoka http://www.pixiv.net/member.php?id=10389829
ryochimo http://www.pixiv.net/member.php?id=30949
Ryu Nakayama http://www.pixiv.net/member.php?id=99951
Shingo Adachi http://www.pixiv.net/member.php?id=75255
Shinya Ohira ? Takuji Miyamoto http://www.pixiv.net/member.php?id=8736626
Shun enokido http://www.pixiv.net/member.php?id=150317
Shinichi Kurita http://www.pixiv.net/member.php?id=313238
Syuuichi Iseki http://www.pixiv.net/member.php?id=417885
Star Driver animators http://www.pixiv.net/member.php?id=5935481
Sunao Chikaoka http://www.pixiv.net/member.php?id=64335
Takashi Mamezuka http://www.pixiv.net/member.php?id=4539873
Takaya Sunagawa http://www.pixiv.net/member.php?id=877227
Tatsuro Kawano http://www.pixiv.net/member.php?id=133745
Tatsuya Miki http://www.pixiv.net/member.php?id=81589
Tatsuya Yoshihara http://www.pixiv.net/member.php?id=4957356
Tetsuya Takeuchi http://www.pixiv.net/member.php?id=389348
Toshifumi Akai http://www.pixiv.net/member.php?id=571814
Toshiharu Murata http://www.pixiv.net/member.php?id=2002176
You Yoshinari http://www.pixiv.net/member.php?id=461718
You Yoshinari 2 (presumed) http://www.pixiv.net/member.php?id=3234048
You Yoshinari 3 (presumed) http://www.pixiv.net/member.php?id=8191442
Youjirou Arai http://www.pixiv.net/member.php?id=56487
Yuki Komatsu http://www.pixiv.net/member.php?id=71370
Yumi Nakamura http://www.pixiv.net/member.php?id=435284
Yuusuke Matsuo http://www.pixiv.net/member.php?id=584085

Unknown / various stuff :
yatanekko (animator but don't know who) http://www.pixiv.net/member.php?id=5065
jumpaoki (self intro : animator) http://www.pixiv.net/member.php?id=1537457
29 (presumed Ryo Imamura but deleted now) http://www.pixiv.net/member.php?id=503786
toshi (his intro tells he did some stuff related to anime) http://www.pixiv.net/member.php?id=637016
magomago (his style reminds me animators doodles, check danbooru for more drawings) http://www.pixiv.net/member.php?id=46663
kuro (same) http://www.pixiv.net/member.php?id=293939
seeta (wants to be animator) http://www.pixiv.net/member.php?id=1918255
hidessu (he has just become key animator) http://www.pixiv.net/member.php?id=74706
aninabe (indie animator) http://www.pixiv.net/member.php?id=666842
taku (don't know if he's an animator but he does cool anime drawings) http://www.pixiv.net/member.php?id=1584199
Shinji (wants to be animator) http://www.pixiv.net/member.php?id=23740
rutarou (animator but deleted his drawings, check danbooru) http://www.pixiv.net/member_illust.php?id=16038
bakenari http://www.pixiv.net/member.php?id=502304
Fairing circle http://www.pixiv.net/member.php?id=346625
koozin http://www.pixiv.net/member.php?id=49036 (animator ?)
goro http://www.pixiv.net/member.php?id=3249935 (animator ?)
maki http://www.pixiv.net/member.php?id=10633 (BRS animator ?)
mina-san http://www.pixiv.net/member.php?id=973418
Mutsuda (Satoshi Mutsuda?) http://www.pixiv.net/member.php?id=7644917
emakawa http://www.pixiv.net/member.php?id=10437624