The Troperion can fire off either fist, either foot, its head, and each intact limb, making it little more than a walking missile launcher, just like its parody.
The Troperior fires off its fist, which in turn fires off every individual finger.
Troperion is mainly meant for close range combat and most of it's combat strength is in the arms. So launching it's arm like a missile combines it's arm strength with a long range attack.
Troperion's Rocket Punch divides in mid-flight into dozens of little hands that trickle the opponent into submission before reassembling into a fly-swatter like contraption that pounds it into the ground before reassembling to give it the finger.
Troperion's arm is broken off, and he throws it at his opponent with his other arm. (see: Dai Guard, Shin Mazinger)
Zig Zagged: Out of weapons, our hero tries to use the maneuver against Monster of the Week, which stops the punch effortlessly. "He he he... He just fell for it". Cue the click of a trigger and a gigantic explosion produced by the bomb hidden inside Troperion's arm. But it turns out the monster is still not dead! "Damn it! Not even that was enough... However, I still have one last chance." So our hero fires the second arm, but the monster dodges it. The monster tackles Troperion and prepares to destroy it, but then the arm returns and explodes, hitting both combatantswith full force.
Averted: Troperion didn't have a Rocket Punch.
Enforced: "During the first few episodes, Troperion didn't have a Rocket Punch, but with the advent of the action figures, we had to add it for the sake of 'accuracy'."
Invoked: The R&D chief turns to be a BIG fan of the Old School Super Robot shows. He/She has the technology AND wackiness, and nobody will stop him/her when from adding this weapon into Troperion.
Exploited: ???
Defied: "A weapon of that nature would actually compromise the structural integrity of Troperion. The risks out-weigh any possible benefit"
Discussed:
"Inconceivable! How come nobody told me Troperion had that kind of weapon?" "Are you kidding me? The giant sword and the Chest Blaster were dead give-aways!"
It turns out Troperion is just a test-bed for the development of more efficient and conventional super-weapons, with the Rocket-Punch system being the prototype for a new class of impact-missile capable of being used multiple times.
The fist projectile and all the electronics within are extremely expensive to replace, so Troperion's pilot burns through truckloads of money with every launch. Any amount of overuse would result in bankruptcy, so the weapon is restricted to emergency use.
Reconstructed:
...However, the weapon proves to be extremely effective under the control of its Hot Blooded test pilot, so they decide to deploy Troperion as a full time unit.
Turns out that rocket punches are a lot more useful if you use a cord to retrieve them after every launch...