Possible Clues:

• Cartoon sign-off speaker
• 'Th-th-th-that's all, folks!' speaker
• Who says 'Th-th-th-that's all, folks!'
• Looney Tunes character who says 'Th-th-th-that's all, folks!'
• Last speaker in many an old cartoon
• 'Th-th-that's all, folks!' speaker
• Cartoon character whose debut film was 'Golddiggers of '49'