Possible Clues:

• Donald Duck or Pluto
• Dora or Daffy
• Bugs Bunny vehicle
• Ren or Stimpy, e.g.
• 16-Across, e.g.
• Cel body
• Bugs Bunny or Elmer Fudd
• Elmer Fudd, for one
• Animator's creation, informally
• Animation critter