Boo-Boo Bear
Boo Boo is a Hanna-Barbera cartoon character on The Yogi Bear Show, an anthropomorphic bear cub in a bow tie, who is Yogi Bear's constant companion, and often acts as his conscience; he tries (usually unsuccessfully) to keep Yogi from doing things he should not do, and also to keep Yogi from getting into trouble with Ranger Smith. Often he would say "But Yogi, Mr. Ranger isn't gonna like this." or some variation. Boo Boo would appear to be a juvenile.
Bow tie
Boo Boo's only set of clothes appears to be a bow tie. In some cartoons Boo Boo's tie is attached to a collar around his neck. However, in other cartoons the tie is stuck directly into Boo Boo's fur on his neck. Several early Hanna-Barbera characters wear collars and/or ties because this was a way of separating the head from the body for independent movement on two different cells, as called for in "limited" animation.
History
Hanna-Barbera appearances
Boo Boo first appeared along with Yogi in the "Yogi Bear" segment of The Huckleberry Hound Show in 1958; when Yogi was given his own series in 1961, Boo Boo went with him.
Since then, Boo Boo has remained at Yogi's side through almost all of the Hanna-Barbera series, movies, and specials in which Yogi appeared, the only exceptions being Yogi's Space Race and Galaxy Goof-Ups, in which Boo Boo's place was taken by a new character named Scare Bear.
Boo Boo's classic voice actor was Don Messick.
Other appearances
In the Dexter's Laboratory episode "Chubby Cheese", an animatronic Boo Boo can be seen on stage with other Hanna-Barbera characters.
In a 1998 episode of The Simpsons ("When You Dish Upon a Star") Homer dreams that he is in a parody of Yogi Bear with Bart as Boo Boo and Ned Flanders as Ranger Smith (whom Homer mauls violently).
Spümcø has made a few parody cartoons starring Boo Boo and the other characters from the original Yogi Bear series, starting with 1999's Boo Boo Runs Wild. In this half-hour tale, Boo Boo's nice-guy persona is heavily satirized with him simply being repressed by all of Ranger Smith's rules and regulations, and finds him regressing into a primal state, complete with typical bear-like urges and mannerisms.
In the Harvey Birdman, Attorney at Law episode "Death By Chocolate" (2002), Boo Boo (voiced by Tom Kenny) was suspected of being a terrorist known as the Unabooboo (a takeoff of the Unabomber). He later appeared in the episodes "Back to the Present", "Blackwatch Plaid" (as an actor in a costume), "The Return of Birdgirl", and "The Death of Harvey". In almost all of these episodes, Boo Boo seemed to have a romantic relationship with Harvey.
Boo Boo also appears in a cutaway gag on the Family Guy episode "Hell Comes to Quahog", in which Peter Griffin stabs and kills Yogi Bear. A shocked Boo Boo is told to tell the other bears what he just saw.
Boo Boo appears in the Robot Chicken episode "Ban on the Fun" (2007), voiced by Victor Yerrid. In a segment that parodies the Laff-A-Lympics in the style of the Munich massacre, Boo Boo is the first to be killed. In "President Evil," he and Yogi end up on the run after Yogi accidentally kills a hunter. When Yogi ends up shot by the sheriff, Boo Boo ends up going all Rambo at the scene (in a homage to his Ram-Boo-Boo character in "Yogi's Treasure Hunt").
Boo Boo with Yogi Bear both appear as guests in a 1996 video called "Kids for Character".