- World War Two
- Japanese (IJA)
- Ki-45 Kai Ko (甲) - one 20 mm Ho-3 ventral cannon, two Ho-103 12.7 mm in the nose and one flexible 7.92 mm in the back position
- Ki-45 Kai Otsu (乙) - the 20 mm Ho-3 ventral cannon replaced by one 37 mm type 94 anti-tank gun
- Ki-45 Kai Hei (丙) - one 37 mm Ho-203 automatic cannon in the nose (for naval target), one flexible 7.92 mm machine gun in the back position.
- Ki-45 Kai Tei (丁) - modified Type Otsu (乙), ad night fighter, equipped with one 37 mm Ho-203 cannon in nose and two fixed 20 mm Ho-5 cannons in a Schräge Musik-style dorsal frontal position, and one flexible 7.92 mm Type 98 machine gun in the back position
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