I agree with Boro that (too) many of the "juicy characters" have been ousted already because of fun and the remaining bunch isn't the most interesting one.

(Di: I don't feel sorry for Gandalf, he's too much of a goody to be interesting in the end)
But how about looking at the entertainment value and something of any substance anyone can come up with these last ones?
Surely it won't be Gloin.
Surely it won't be Chrysophylax Dives.
Tolkien's Gimli is a reasonably interesting character (opposed to PJ's slapstick one)but Smaug probably has the most character of these remaining ones. Varda made the stars and they are a source of everlasting astonishment. Thorondor is a hero, but a bit thin one?
So let's just continue with the good idea of getting rid of Gloin first...
Sorry to be this open. But we're reaching the final stages here, so who cares?