Wouldn't it be nice if we could get at least these basic Rebels characters (or later season versions) in TVC? Maybe sprinkled over 2-3 years, since the number of sources to base figures on keeps increasing.
In he new expanded universe, he becomes Grand Vizir (taking up the role of Sate Pestage in the pre-Disney expanded universe), and ends up a somewhat recurring character in some of the recent books/comics. More is told about him in the Aftermath trilogy (which I did not like that much, as the writing style was only average in my opinion and the story did not really leave a fantastic mark). You can find the details on Wookieepedia !