What rewards that are claimable, are only claimable once?

I've made a character on a region im not so sure I want to stay on, what rewards are claimable that I'd miss out on forever on a new region?

Like what are these rewards labelled as? There are so many - I just wanna know which ones to not claim?

This post was edited by Technicity on Feb 20 2022 04:35pm

Aren't rewards claimed to the roster? If that's the case, I suspect the rewards stay on the old server while you start up on a new server with a new roster.