Artist. The virtual youtuber tag is giuniu (vtuber).
This tag is associated with two (or three) nicknames. Probably they are the same person.
https://www.pixiv.net/users/265292
https://www.pixiv.net/stacc/peach-tea
https://twitter.com/g1un1u
https://twitter.com/intent/user?user_id=158224971
https://seiga.nicovideo.jp/user/illust/5071883
https://www.nicovideo.jp/user/5071883
https://pawoo.net/@peach_tea
https://pawoo.net/web/accounts/324016
https://g1un1u.fanbox.cc
https://www.pixiv.net/fanbox/creator/265292
https://sketch.pixiv.net/@peach-tea
http://blog.livedoor.jp/g1un1u/
https://piapro.jp/peachtea
https://www.youtube.com/channel/UChLMzSFA9ksLeoh1L7iCj7Q
https://www.dlsite.com/books/author/=/author_id/AJ008071
https://www.dlsite.com/pro/fsr/=/keyword_creater/"ぎうにう"
http://theinterviews.jp/g1un1u
http://twitpic.com/photos/g1un1u
http://yfrog.com/user/g1un1u/photos