So if Robin's flower-flower DF manifests parts of her body, I'm assuming that those body parts are exact replicas of her original body. So my guess is that if she became a body builder and started lifting weights with Zoro or Ivan gave her a steriod injection, her arms would be swole AF and her devil fruit would be even more powerfull, maybe she could even fly for longer periods of time too, but idk what do y'all think?
(Obviously this won't happen I'm just saying it'd too legit)