>>96895882
The smallest one is a Mobile Infantry Powered Suit from Starship Troopers (picrel). The aqua & white one is an original design, seen here >>96893901. And if the tiny, sand-colored one between the Starship Troopers 'suit and the Scopedog is from Gasaraki, it's much too small. Tactical Armors are slightly taller than Armored Troopers like the Scopedog.