More fictional prosthetics need to have, like, tools on the end rather than fingers. Like real prosthetics only recently got good enough to Be Functional Hands and even now theyre still pricy as hell, so usually they arent A Recreation Of The Limb theyre like, a grabber, or a scoop, or whatever would be useful. Or a nonmoving hand shape for hand vibes. And electric prostheses shouldnt be used in wet or dirty environments, which isnt ideal for object show contestants.
And since there are a lotta limbless objects that people give prosthetics to, i like to think about what prosthetics they would actually have rather than just “normal hand but metal”. Like my gaty gijinka has elbows but not much past the elbow, and her prosthetics (which she only wears when competing or working) are like a hook thing and a grabber-scoop-thing. And my suitcase usually only wears one (if that) and its a paddle with a ridge. I dont think nickel uses any hes just really flexible so he does everything with his feet. Which means hes also barefoot most of the time and has super calloused feet so he can just walk on legos without caring hes like the archery pole dancer guy when it comes to being barefoot on rough terrain.