https://weibo.cn/u/1996669711

怎么还有人上传五六年前的cos的..

Base +6, Izysky -6

没好东西了吧

Base +5

I tried to figure out who the character here is... seems to be one of a pair of mascots of a site called 第一弹 according to this page? https://zh.moegirl.org.cn/弹娘弹妹

At any rate, the first page in this gallery is clearly based on this illustration: https://www.pixiv.net/artworks/60999434
There are several other illustrations of these characters on the artist's Pixiv, including the illustrations shown on the site I linked above.

I'm unsure if that qualifies as an "established character" in accordance with this site's rules against "generic cosplay" galleries...

Base +12