You cannot play more than one PC at a single REFUGE event unless your character dies permanently and you start a new one. This is to prevent confusion by other players, who might have difficulty determining if your character suddenly changed costumes or was the target of a ritual that changed their species entirely.
When playing multiple characters over time, please keep those characters significantly different from one another. Different characters played by the same player should have different adventuring parties, different costumes, and different species.
Multiple characters belonging to the same player may never directly interact in any way. You cannot have one of your PCs sell, donate, or will items to your other PCs either directly or indirectly through an intermediary.