Artist. Has several names.
Japanese name: あこ (Aco: romanization used by the artist, Ako: danbooru's official romanization)
The other names: やませみ, 山翡翠 (Yamasemi), "@co", "y", やま (Yama), やーま (Yaama), 或故 (Ako), あーこ (Aako), いず (Izu), いずこ (Izuko), ✧あ✧, プルガ (Puruga), あっ (A!), あ (A), 山川 阿古 (Yamakawa Ako), yamyam, yammmmm, 山山山山山山山山山山山山山山山, SCP-0721【あこω】, 第4545使徒アコエル, 影山 せみ (Kageyama Semi) or gumgum
Site names: wiwi or ぶっぽうそう
https://www.pixiv.net/users/746787
https://www.pixiv.net/users/3854905
https://www.pixiv.net/users/23585312
https://www.pixiv.net/stacc/acms0k0kk
https://www.pixiv.net/stacc/aco_ccccck
https://www.pixiv.net/stacc/zgzgzgirm
https://twitter.com/aco_cccccK
https://twitter.com/intent/user?user_id=158576216
https://seiga.nicovideo.jp/user/illust/9941710
http://com.nicovideo.jp/community/co449810
https://www.nicovideo.jp/user/9941710
https://pawoo.net/@Mo12ss
https://acoccccck.fanbox.cc
https://www.pixiv.net/fanbox/creator/23585312
https://sketch.pixiv.net/@acms0k0kk
https://sketch.pixiv.net/@aco_ccccck
https://sketch.pixiv.net/@zgzgzgirm
https://www.tinami.com/creator/profile/42601
https://gwiiiii.tumblr.com
https://wi0iw.tumblr.com
https://wiiiiiw.tumblr.com
https://yugamineeeeena.tumblr.com
http://wiwiwa.web.fc2.com
https://piapro.jp/acosan0nm
http://twpf.jp/0wzilisw0
https://www.pixiv.net/stacc/user_pgaw4787
https://twitter.com/0wzilisw0
http://p.twipple.jp/user/0wzilisw0
http://twitpic.com/photos/yamaseminmin
http://twitpic.com/photos/yammmmmstsk