Artist. Formerly tagged as yuiyo-y.
One of missing pixiv artists seems to be the same person as Kiiroi Tamago.
Japanese name: きいろいたまご (Kiiroi Tamago, lit. yellow egg)
https://www.pixiv.net/users/1218369
https://www.pixiv.net/stacc/kiiroitamago
https://twitter.com/kiiroisouko
https://twitter.com/tamagokiir0
https://twitter.com/tamagokiiro
https://twitter.com/intent/user?user_id=1116970322840805377
https://twitter.com/intent/user?user_id=1166172688148074497
https://twitter.com/intent/user?user_id=1300085216820641862
https://sketch.pixiv.net/@kiiroitamago
https://www.pixiv.net/users/920882
https://www.pixiv.net/stacc/yuino-y