While Monster Musume manga author Takemaru "Okayado" Inui does maintain a presence on Twitter, he's not a creator that shares that many sketches. Maybe just a few a year. However, this spring, the lead into the Monster Musume anime inspired him to post some neat illustrations, with a series of sketches of the series' leads cosplaying as their young, increasingly popular voice actresses' other roles.
Sora Amamiya's Miia as Elizabeth Lyonesse from the Seven Deadly Sins
なんとなく思ってた事を落書いてみる（・ω・ ） pic.twitter.com/8JkzkGk8ci— オカヤド【モン娘アニメ絶賛放映中！】 (@okayado1215) April 26, 2015
Natsuki Aikawa's Cerea as Ms. Baker from Gundam Build Fighters and Petra Ral from Attack on Titan
セントレアの中の人、相川奈都姫さんネタ、この私のパーフェクトプランによって…！ pic.twitter.com/buiJRQ18FK— オカヤド【モン娘アニメ絶賛放映中！】 (@okayado1215) May 27, 2015