On the list, I could do Taz and Donald Duck for starters. I would pick Scooby Dum, but I haven't seen his character for a while, so I don't know how he acts.
Other characters I could play not on the list would be Don Karnage w/ Mumbles (his whispering sidekick), and/or Yosemite Sam, all of which could be on the Really Rottens team.