1) Basket cases 2) Kooks 3) Loonies 4) Oddballs 5) Oners 6) Weirdos 1) Cranks 2) Many Tim Burton characters 3) Odd numbers 4) Unconventional ones 
Public Domain source: Photographed, reduced to grayscale, and saved as a JPG by Dale Mahalko, Gilman, WI Source and copyright information: ...