Who does not love a mascot? Usually the mascot during the game is some college co-ed stuffed into an over sized foam costume. Or they’re dressed in a costume, with or without their face painted.
Pretty much if your team is getting blown out by 50 and you want to jump off the 500-level of your stadium; the mascot is there to help you stay off the ledge.
Some schools use live animals as their mascots. Other schools use the students that are enrolled. Either way the mascot brings a certain entertainment to games that can be felt either at the game, or while watching at the comfort of your home.
Lists are meant to be debated, and this one I'm sure will come under heavy debate. I did try to include all six of the major BCS-conferences. If I left your school out, well, then I'm sorry. You will have to make your case known in the comment section.