I remember being at the Q&A at Celebration 2 with Hasbro and someone asked about how do you keep doing the same figure over and over again (12 years ago!!!) and they were very adamant about wanting to see costume changes and somewhat deflated on the lack of them in the PT. Outside of Padme, these never materialized in the PT, even when they begged for it (Jedi pilots wear nothing but headsets? What?). The CW micro-series got into this somewhat, and produced probably the two most famous 'alt-modes' of the era in Clone Armor Obi-Wan and Snow Bunny Padme. I think Lucas definitely created a big cast of characters to generate toys, because that's Star Wars, but if he had his mind completely on it he would have been more deliberate about the main characters.