Very few of these pins are of actual characters as the Star Wars lore story lines go Troopers were "cloned" to be military fighters. Its not until the animated shows of Clone Wars and Rebels were clones were developed into characters to fill story lines. Many of the pins in this set are of Trooper types and variation represents the Phases of armor development during the years of the Empire (think episodes 1-6) and into the New Order (episodes 7 - TBD). I will try to reference the appearance of the trooper to give you an idea of the time frame of when the armor changed for the trooper.
Row #, left to right, Description of Clone, (appearances/as seen in):
Row 1: 501st Legion Clone Trooper, (Episode 3, Clone Wars, Rebels); Captain Phasma (Episodes 7, 8); Biker Advance Recon Commander Trooper (Clone Wars, Rebels); Commander Cody (Episode 3, Clone Wars); Attack Clone Trooper (Clone Wars, Rebels)
Row 2: Clone Trooper Private (Episode 1, 2); Clone Trooper Lieutenant (Episode 1, 2); Clone Trooper Sargent (Episode 1, 2); Clone Trooper Private (Episode 3, Clone Wars, Rebels); Coruscant Guard aka Shock Trooper (Episode 3)
Row 3: Clone Trooper Commander (Episode 3); Clone Trooper Captain (Episode 3); First Order Trooper (Episode 7, 8); Storm Trooper (Episode 4, 5, 6); Scout Trooper (Episode 4, 5, 6)
Row 4: Snow Trooper (Episode 4, 5, 6); Shore Trooper (Rouge One); Death Trooper (Rogue One); Flame Trooper (Episode 7, 8); Snow Trooper (Episode 7, 8)