Artist.
Japanese name: 鯵太郎 (Ajitarou) (reading is a best guess)
The other names: せつ (Setsu), "AJ" or たれみみ (Taremimi)
https://www.pixiv.net/users/1401955
https://www.pixiv.net/users/11450608
https://www.pixiv.net/stacc/sakasakisetu
https://www.pixiv.net/stacc/sakasakisetu2
https://twitter.com/sakasa_setu
https://twitter.com/intent/user?user_id=1649712191476756481
https://fantia.jp/fanclubs/204529
https://fantia.jp/AJTR
https://nijie.info/members.php?id=24361
https://sakasakisetsu.fanbox.cc
https://www.pixiv.net/fanbox/creator/1401955
https://sketch.pixiv.net/@sakasakisetu
https://www.tinami.com/creator/profile/54385
https://misskey.io/@Ajitaro
https://misskey.io/users/9dpflkvdok
https://privatter.net/u/setunyan_AJ
https://ci-en.net/creator/15685
https://twitter.com/sakasa_aj
https://twitter.com/setunyan_AJ
https://twitter.com/sk2_ajtr
https://twitter.com/intent/user?user_id=139728700
https://twitter.com/intent/user?user_id=1545451153613553664
https://twitter.com/intent/user?user_id=1606580570414202885
http://twitpic.com/photos/setunyan_AJ
