Step 1 : Introduction to the question "Which character was "smarter than the average bear"?"
.....Smarter than average. It's a reference to the character Yogi Bear, from the cartoon of the same name, who would trick tourists out of their picnic baskets at Jellystone ... average bear - ..... (idiomatic) The norm; an average person; Used in comparisons. She's no smarter than the average bear. I'm not saying he's fat, but he is heavier than the average bear.
Step 2 : Answer to the question "Which character was "smarter than the average bear"?"
Yogi Bear was the first breakout cartoon character created by Hanna-Barbera, and was given his own show, The Yogi Bear Show in 1961. Yogi Bear had a number of catchphrases, including the phrase, “I'm smarter than the average bear!" Art Carney's Ed Norton character on The Honeymooners was said to be Yogi's inspiration; his voice mannerisms broadly mimic Carney as Norton. Yogi's name was similar to that of contemporary baseball star Yogi Berra, who was known for his amusing quotes. Berra sued Hanna-Barbera for defamation, but Hanna-Barbera claimed that the similarity of the names was just a coincidence.