[Den-O]

The official main form combos based on actual toys are:

*Gao King + (Spear, Sword & Shield, Spear & Shield, Cross Horn, Double Knuckle, Another Arm, Striker, Spear & Knuckle

*Gao Muscle + (Striker, Cross Horn Striker, Striker Spear, Shark & Tiger)

*Gao Cracker (an alternate name for Gao Muscle Shark & Tiger but officially recognized separate combo)

*Gao Hunter Evil + (Spear, Double Knuckle)
*Gao Hunter Justice (when in Justice mode it never uses other arm attachments. The other arms were only used by Gao Hunter Evil)

*Gao Icarus + (Antoher Arm Another Feet)

*Gao God

*Gao Centaurus

*Gao Knight

God, Centaurus, and Knight have never been shown to swap limbs so there are no known alternate combos there. But the toys are 100% capable of free mix and match possibilities. There are several unused formations from behind the scenes show only in the artbook. Most would have required a couple news figures, some were entirely new.