Flippy : Killing, No Witness..

Emotionally tattered, this bear veteran will warm your home and leave no witnesses. Flippy is a militaristic bear, a veteran of war who is sent into a violent rage when he hears or sees something that reminds him of war, such as a crackling campfire or someone with ketchup spilled on them. His Post-traumatic stress disorder is often the cause for grisly, Guerrilla-style executions for his friends. Usually when he goes nuts his eyes usually turn yellow. A note of interest is that Flippy's prefered methods of killing and his own background are likely to be references to Rambo. This is especially evident in the episode Hide and Seek, where Flippy mimmicked Rambo's actions in a scene from Rambo: First Blood Part II as he hunted and killed his friends in the woods, in which they were supposedly playing a game of hide and seek.

Episodes:

Happy Trails pt. 2: The rocket he is in with Sniffles and Handy burns up in the Sun.
Remains to be seen: He is killed in a crash, and again when reanimated in a graveyard (Halloween episode).