sure. and the fictional child is a 400yo of a nonhuman species that is naturally small in nature and so if you were to put human features on a melusine they'd look more human childlike than not (also just the fact that hyv only uses 5 models and they wanted a playable melusine so they needed to come up with a reason why sige looks humanlike, but if they gave her a taller model she'd look too different from her fellow melusines)

and if you believe her a child, you should be more concerned about all the actual in game canon stuff surrounding her 🤪

but in the end none of this matters bc like you said, it's fiction and she's fictional

and i still want a panty shot of her