The infantry used by the Trade Federation had several major shortcomings that were carefully revisited by the battle droids' designers. From that research came the super battle droid, a bulkier, stronger, and more advanced version of the standard mechanical soldier. The super battle droid requires no overriding command signal to operate, and thus has a limited degree of independence. They are fearless and tireless, and will run at full speed into combat, their cannons extended, firing until they have reduced their targets to smoldering ruins.
Many people in the galaxy fear droids, what with the memories of the Clone Wars still fresh in their minds. Far more terrifying than battle droids were assassin droids, independently programmed mechanical killers that had no masters. IG-88 is a battered chrome war droid who has become a bounty hunter, and answered Darth Vader's call to capture the Millennium Falcon during the events surrounding the Battle of Hoth.
Lothal is a diverse planet, with both farmland and a city center. During the age of the Empire, it fell under Imperial occupation, as farmers were kicked off their land and enormous TIE fighter and weapons factories were built. While most of the population felt powerless in the face of Imperial rule, a select few dared to fight back.