I've done so many different ones in the past! One fun one is to layer up different shirts with a super hero logo on it and then combine superhero theme music to just change from superhero to superhero. Or one i did this past year was have a dance recital. I am a male mascot and i wore a tutu which everyone found hysterical. I had a back drop( was a blanket with 2 girls standing on chairs holding it up on the sides) and then i had my "ballet teacher" she watched me dance and as she went behind the back drop music would change and i would start dancing to crazy music. I did this for 2 more times and then the last song was the harlem shake. We it was suppose to get crazy the back drop fell and i had my cheerleader dressed up dancing however. It was extremely cute and everyone enjoyed it!
A mascot can and should be the center of attention at any event. Find a skit to fit your mascot at this site. Also, find things to get a crowd going and things to do on the sideline. You can find more information here: http://www.mascot.net/skits.html