Wayfinders
Wayfinders are the name for Mutants with the ability to hop between dimensions at whim. All Hoarders have this ability innately, but such abilities are very rare for a normal Mutant to have due to the sheer power and precision it requires. Most Wayfinders also only are able to hop between dimensions while navigating the Vulga Delta, so the few that open portals that allow free unrestricted movement are highly coveted.
From what you know right now, there is no known central registrar or need to report your abilities to The Kuvava, and likely due to their rarity and potent power most keep it a secret.