Agent R is a raccoon, who works for the O.W.C.A.. Her first name is unknown, and she appeared rarely, though she takes part in a major fight. It is possible that she has a nemesis. ("It's About Time!")
There could be more than one raccoon agent. The raccoon agent that appears in "Candace Loses Her Head" has different fur coloring around the muzzle, chest and front paws than the agent that appears in "It's About Time!". And the one that appeared in "Robot Rodeo" was like a mix of the first two.
So far only Raccoon #2 has appeared the most often and most unlike Raccoon #1 & #3 which they had only 4 (#1) and 1 (#3).
They could also be siblings as since most raccoons would live together.