Grizzly "Grizz" is a grizzly bear. The oldest and the leader of the brothers, Grizz is a fun-loving bear who tends to get the others into random hijinks. Grizz is paradoxically highly sociable yet socially inept. Despite this, he is constantly wanting to meet new people and tries to befriend everyone he comes across. As a baby, he was rescued by a team of firemen who prevented him from falling off a tree-top during a storm. It seems that he was younger than in the episodes "The Road" and "Pet Shop" and didn't know Ice Bear or Panda according to the flashback pictures in "Burrito".
Panda is a giant panda. He is the middle brother and is nicknamed Pan-Pan by Grizz. He is tender-hearted and gets embarrassed or anxious easily. Panda has a lot less self-confidence than his brothers. He is good with technology, and uses that skill on online social media and dating sites. He is the more creative of the brothers, and undoubtedly the "cutest" as settled in "Panda's Sneeze." Panda is a vegetarian and has a severe allergy to peanuts and cats.
Ice Bear is a polar bear. He is the baby brother of Grizzly and Panda. Ice Bear is often stoic and rarely speaks. When he does, he speaks mostly in the third person and mostly says his name first before anything else. He learned to talk much later than his two brothers, as we learn in "The Island". He is multilingual, having been shown to speak Korean and French fluently. We see that Ice bear is able to speak to pigeons in the episode "Our Stuff." He is also a skilled chef, salsa dancer, a novice at robotics, and a martial artist. Ice is the most composed of the brothers, always maintaining an "ice-cool attitude" in even the most awkward and embarrassing of situations. As we see in "Losing Ice", his brothers often take him for granted and are unappreciative of all the cooking and cleaning he does. Ice Bear sleeps in the refrigerator with a fire axe. [Source: wikipedia]