Artist.
Japanese name: ぐふ (Gufu)
Old names: ぐっふーむ, グッフーム, "gufuu6" or "gufu6" (Guffuu-mu)
https://www.pixiv.net/users/3074618
https://www.pixiv.net/stacc/ech17
https://twitter.com/gufu6
https://twitter.com/intent/user?user_id=588220503
https://pawoo.net/@gufu6
https://pawoo.net/web/accounts/416387
https://sketch.pixiv.net/@ech17
https://privatter.net/u/gufu6
https://www.amazon.co.jp/dp/4839955972/ref=cm_sw_r_tw_dp_APvGxbV66GVD3