Anime Animals アニメの動物@tayledras
Well, the character designer the novel chose is #Kantoku, whose specialty is drawing lolis and supermodel-level girls. His characters certainly lack diversity, but it does appeal to his target audience (male Japanese teenagers to adults). As for if that's a good thing... 
It's how capitalism works 
If you're looking for animanga that celebrates body diversity, you'd probably want to look at the works by #DeliciousInDungeon artist Kui Ryoko (九井 諒子). Someone did a great video about her works here: https://www.youtube.com/watch?v=z0Hr2_uX73o
HuffPost Japan - Athena2
