This website can guess pretty much any sitcom character using process of elimination based on a series of questions.
http://www.smalltime.com/dictator.html
The ones it got right include the following, some of them pretty damn obscure (most of these from the 80s):
Mallory from Family Ties
Alf
Vickie from Small Wonder
Screech
Gilligan
Larry, from Three’s Company
Balki from Perfect Strangers
Mork
The “Gooch” from Different Strokes
Samantha Micelli from Who’s the Boss
Latka from Taxi
Buck Bundy (the dog) from Married with Children
Munroe from Too Close for Comfort
Harry (Bigfoot) from Harry and the Hendersons
The only one I stumped it on so far was Boner from Growing Pains. Pretty impressive track record so far. Anybody with some good obscure charecters to throw at this?