5. The A-Wing pilot because it is just too plain overall. This Mini-Figure is found in set 6207 released in 2005.
4. Chewbacca because it has no eyes that are showing and has just one color. It is the old Chewbacca from sets ranging from 1999-2013. The new Chewbacca is much better-see my blog on the top 5 best Star Wars mini-figures to see the new, improved Chewbacca.
3. The Skyhopper pilot because it has a very plain helmet with hardly any detail on the torso. Found in set 4477 released in 2002.
2. The Lego Star Wars battle droid (old version) because it has a side arm holding the gun slanted. Very plain in color. Found in sets 1999-2006. The new version is just a lot better in many different ways.
1. Lego Star Wars C3PO {old version} because it has a very ugly tan color to it and doesn't go well with the mini-figure and has very strange eyes. Found in sets 1999-2008.