>In order to meet the desire of a wide variety of types of men, they range from having full, voluptuous bodies, to having bodies that stay like that of a child and never grow.
That's from the Succubus profile, all MGs are half Succubus so this should apply to some extent
There is also a few lines about differences between individuals in World Guide 1
>Compared to the original species, they have a hugely different nature and traits, so we are treating them as a different race out of convenience, but technically they are just varied individuals of the original race
If you can have a monster girl born so different from her original species that it's more convenient to give her a new species, then there is most likely no issues with a tall, busty Dormouse
>For example, the physique, and hair color, etc. of a medusa may vary, but the common traits of a medusa, snake hair and the lower body of a snake, match up. Also, many individuals basically have a lonely, stubborn personality.
This bit of text pretty much confirms it too, it talks about Medusas but they're just an example, this applies to all MGs
And even if we look past the profiles, books and canon, with KC's attitude of "If you want it and it's not absolutely horrible, then you can have it" anything goes, an albino nerd Hellhound, a loli yandere Jabberwock, a milf kuudere Baphomet, as long as you're not hurting anyone you can have your own special waifu