Inspiration

I agree that there are a lot of fictional characters that have prosthetic arms. But Luke Skywalker is by far the most famous.

Also don't talk about Voltron on the internet

alas, another decent thing ruined by the fanbase

Nah. Just ignore the fan-dumbs as best as you can and enjoy (or don't enjoy) a work on its own merits. Unless fans are actually somehow involved in the production, don't let them taint your personal experience of it. Anything that gains enough popularity is bound to have at least some unpleasant fans in the mix.