Hey, that'd be fun! Obviously I don't expect you to have a token BBW since I know from experience that that can be hard to do in 3D VN modeling in a way that hits a mix of realistic and appealing to more than just chubby chasers. It's also difficult to model female characters who are petite, small-breasted, and short without looking like children (and I say this as an IRL legal loli myself). But hey, anime like Uzaki-chan, Dragon Maid, goblin girls, and Mythic Manor show there's a definite market for shortstacks and MILF-type bodies. :3
Oh, but if the inspiration ever struck you and you had the idea to include a full-figured girl, I personally think Nikuko from "Please Tell Me Galko-chan" is a great example of drawing one with a design that can appeal to more than just chubby chasers. It helps that the boys in-story consider her hot and she's a rare case of "fat and proud." She even got more and more screentime as the manga went on because the author saw that a lot of her fans really liked Nikuko. Also a really fast runner and swimmer despite her weight which is pretty truth-in-television. My current girlfriend is a big, beautiful woman and she's way more physically capable than my slender, 120 lbs soaking wet form. XD
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I do have tried making "chubby" characters but as you said it is pretty hard, however, I'll keep trying it since having one or two chubby characters in the game would be pretty interesting. I'm very careful when making "petite" characters because I don't want them to look as "loli" since that could be illegal in some countries. That's why I tried making Elizabeth rather creepy instead of cute and Honey something like a petite girl with kind of big breasts