Boo-Boo Bear is a Hanna-Barbera cartoon character on The Yogi Bear Show and Yogi's constant companion. Boo-Boo often acts as Yogi Bear's 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.

Cindy Bear is a cartoon character created by Hanna-Barbera Productions. She is one of the primary supporting characters of the Yogi Bear franchise as well as a regular in the stable of frequently appearing Hanna-Barbera animated personalities. Cindy was originally portrayed by voice actress Julie Bennett, who reprised the part for most of her appearances from the 1960s through the 1980s.

Ranger Smith (often addressed politely as "Mr. Ranger, sir" by Yogi) is the authority figure and main antagonist of the classic Hanna-Barbera animated franchise, The Yogi Bear Show. As the serious, by-the-book head ranger of fictional Jellystone Park, his primary job is to keep the peace, protect the tourists, and—most importantly—stop Yogi Bear from stealing "pic-a-nic" baskets.

Yogi Bear is a cartoon character who has appeared in numerous comic books, animated television shows and films. He made his debut in 1958 as a supporting character in The Huckleberry Hound Show.