OH, I almost forgot!!! On Umkas, you find Ben Gan from the Treasure Island, written by Robert Louis Stephenson
Some more:
Hogan, the orc, guarding the forward entrance to the frog on Dersu. Maybe something to do with Terry "Hulk" Hogan?
The fallen star - Je-Lo-Pi. Very Close to J-Lo-P, which is close to the nickname Jennifer Lopez used for a while J-Lo.