Stormtropper, inarguably, is one of the most popular character in Star Wars. They are the elite shock troops in the Imperial Army, particularly distinguished by their loyalty to the founder of the Empire Sheev Palpatine. They wear the iconic white armour over a black body glove with gears that allow them to survive in mo0st environments. There are several specialized subgroups including the spacetroopers, snowtroopers, scout troopers etc.
The ranking system for the stormtroopers can be easily seen from their ear plate of the helmet. The enlisted ones start with no stripe. The officers, on the other hand, start with striped. The General of all ranks has 4 stripes. The private recruit has no stripes at all.