Banjo is a brown honey bear, who is one of the two main protagonists of the series. He has a younger sister named Tooty, who plays a big part in Banjo-Kazooie but is absent in Banjo-Tooie and Banjo-Kazooie: Nuts & Bolts. He is polite and well-mannered, and is always seen wearing yellow shorts with a belt, a shark tooth necklace, and a bright blue backpack. The backpack usually contains his good friend Kazooie. When they're split up, he can use his backpack to carry helpless subjects and take them to their right places. His only solo attack is the Pack Whack. He was first seen in Diddy Kong Racing where he started his career. His arch-nemesis is Gruntilda the witch. He can also play his namesake instrument (a banjo). He transforms into creatures and things that originate in some worlds like a bee in the games. His home is Spiral Mountain.
Source: Wikipedia, "Banjo-Kazooie (series)", available under the CC-BY-SA License.