Two mascots are better than one, but there are multiple Wildcat mascots, just like there are multiple Cougar mascots. Having a male and female mascot is something not seem a lot around college sports so that adds a fun aspect to it.
The one thing that is different about Wilbur and Wilma is that they are actually married. It brings a different aspect to the mascots, but they do look a little creepy as mascots.