Can anyone tell me if they have character appearances at Univ Studios Hollywood?

[jabead]

My family is going to USH this summer and the kids really enjoy meeting characters. Can anyone tell me if characters make appearances at USH and if so then who we might see? The kids are especially interested in any of the Nickelodeon characters.

[apanopio]

Just got back from Universal Studios Hollywood over Memorial Day weekend and I spotted the following characters roaming around the park:

Spiderman (very popular)
Fred Flintstone and Barney Rubble
Bride of Frankenstein
Frankenstein
Woody Woodpecker
Rugrats
Shrek
The Marx Brothers