Previously had a Twitter account by the name @Lewis__ (created in 2012 or earlier), but the account has subsequently been deleted. The name was later taken by another unrelated Twitter user in 2018. A 2014 snapshot of the original account may be found here.
https://www.pixiv.net/users/567332
https://www.pixiv.net/stacc/okun_in
https://twitter.com/_Okunin
https://twitter.com/intent/user?user_id=77342456
https://okunin185.booth.pm
https://seiga.nicovideo.jp/user/illust/541247
https://www.nicovideo.jp/user/541247
https://sketch.pixiv.net/@okun_in
https://www.tinami.com/creator/profile/13154
https://jikkyousozai.tumblr.com
https://okuni185.tumblr.com
http://okuninokuni.blog.fc2.com
http://www.dlsite.com/home/circle/profile/=/maker_id/RG19566.html
https://www.pixiv.net/stacc/bvd4242564
https://twitter.com/lewis__
https://twitter.com/okunin185
https://okunin2.tumblr.com
http://www.geocities.jp/oku_nin/okunin.html
http://p.twipple.jp/user/Lewis__
http://twitpic.com/photos/lewis__