This is not for everyone, but in addition to Disney characters, they have a variety of other entertainers, like the Uninvited Guests and the Tacky Tourists. These cost $1,100-$1,300 and are pairs of actors who show up and interact with your guests - and the Tacky Tourists share Disney info and trivia.
There's also the English Butler and the Major Domo, who can be worked into both the ceremony and the reception, but they're only $650 a piece. Oh - or you could have two herald trumpeters announce your arrival - that's $1,100.
But, like I said, not for everyone...