Waltzing Bear
Waltzing Bear was a Lightweight robot built by Team SlamDancer that registered to compete at ROBOLympics 2004. It was a silver, four wheeled, box shaped robot armed with a lifting wedge, and it had a stuffed bear riding on top of the robot. However Waltzing Bear did not compete at ROBOLympics, and never attempted to compete at another event afterwards.
The team that built Waltzing Bear also built SlamDancer which competed in Season 5.0 of BattleBots, which performed decently, winning two battles before being eliminated.