This one is actually a part of the first team of wererats, but the figure broke in half in the kiln and had to be glued together. The face comes from a Pee-Wee Herman bobblehead. I think he's dressed like a Jedi.
This wererat has the look made popular in the AD&D Monster Manual.
This one has the face of Waylon Smithers, as seen in the Simpsons episode Rosebud.
This one has the face of GI Joe or a similar heavily muscled doll for boys. It looked better before glazing.