At next level, sure (as long as it's not Wizard).GreyWolfVT wrote:If anything I may add a class to Kelben but not make a new character.
Unless you're talking about creating a Kelben II that is 2 part rouge and 1 part something else? I guess that'd be fine, too. However, I've noticed (at least with equipment), that once something is added, it's tricky to get removed so if you are going to reconfigure Kelben, I would suggest actually rebuilding him as a new character in D&D Beyond and not monkeying around with the existing character.