D Dick Dastardly - villainous character in Wacky Races cartoon show... or Daffy Duck - unpredictable aquatic wildfowl. Quite likely to swallow an anvil, stick of dynamite, etc
or... Elmer Fudd - dim-witted hunter, who rarely came out on top in encounters with Bugs Bunny
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F Fred Flintsone - from the Flintstones cartoon show
or... Grape Ape - tv cartoon
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H Huckleberry Hound - Hanna-Barbera tv cartoon dog. Often sang (out of tune/with incorrect lyrics) "Oh my darling , Clementine"
L Lippy the Lion... and Hardy Har-Har. Tv cartoon lion (and hyena sidekick). Hanna-Barbera animation , but not a classic. Not as good as other feline characters like Snagglepuss ... or the Pink Panther
...or Obelix - big lad, who is assistant to Asterix the Gaul in
the French comic strip named after the latter
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P Popeye - the Sailor Man (thanks for the clue!).
I'd forgotten about that one
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R Rocky and Bullwinkle tv cartoon. Rocky (Rocket J. Squirrel) was a flying squirrel, Bullwinkle was a moose. It was a spy story spoof (sort of).