No One Likes a Know-It-All
Adding in as characters the fun people you work with or know in life is a fun idea to add dimension to your program. Find the smartest person in the building (someone preferably at a Mensa level) and pit them against the listeners on occasion in a trivia contest your co-worker rarely, if ever, loses. Call the feature “No One Likes a Know-It-All” which acts as your hook phrase at the end of every installment.