Also known as ´´roivas`` on danbooru.
They love Chihaya Kisaragi from Idolmaster, and you can find plenty of drawings of her all over the gallery, but if you want to just go direct at them, check the last post on pixiv, there you have all of them in one big post.

https://twitter.com/Belzzird
https://www.pixiv.net/en/users/26621585