Chaplin
Better off silent
First thought that popped in my mind is Thrawn, but I don't think the fit is right unless RDJ wants to try something he hasn't really done before.Interesting. It's possible he might be coming on as a different character then too. It's been feeling that they were trying to do an MCU type thing with season 2 where it let them create shows for the different guest characters and then down the line have an "avengers" event that brings everyone and everything together.