>missing the point of the line
It's based on Kaijin, weird Superheroes/Villains in Japan media. In this case, Pawniard's line is exactly how it works.
The first one is just a Foot Soldier/Pawn/Henchman, the next has elevated himself to Bishop/Warrior, and more of the Sidekick. Kingambit (King's Gambit, chess reference again), has now elevated him to basically Lord. If he had a 4th Evolution, he'd likely be Shogun or Emperor. He is now the head villain.
It's literally all a big Chess/Villain play, his aesthetic is just based on Lower Class Samurai/Soldiers in Japanese history that evolve over time, as he grows into a greater Villain and Warrior himself. It's the whole fucking point, it has nothing to do with Bugs/Kamen Rider you absolute morons. Even if it did, not every Kamen Rider Villain is bug themed, some are Samurai themed.