@Stork: tapuo -> kasiwagi_kazuhiro tapuo's pictures...

Stork
2008-04-12T23:04:45-04:00

tapuo -> kasiwagi_kazuhiro

tapuo's pictures listed here http://danbooru.donmai.us/wiki/show?title=tapuo

match up with the pictures on limit_cycle's blog here
http://www.ummb.jp/lc/blog/

and the LC blog links to Tapuo's pixiv account here http://www.ummb.jp/lc/blog/2008/04/post_129.html

At the bottom of the limitcycle page the artist is identified as KasiwagiKazuhiro / Limit Cycle.

Therefore Limit Cycle = Circle, kazuhiro_kasiwagi = artist, tapuo = alias of kazuhiro kasiwagi.

Also. kawa_yoo = Kawaguchi_youhei, as confirmed by his website.