i am currently working on a character that has lost his lower left arm and lower right leg, and replaced them with special prostetics. some would argue that these would be bodyparts and therefore need to be placed in the character sheet, but these are interchangable, and therefore not really a part of his body.
Arm:
- steel fist: a steel replica of his original hand, with a clutced fist. the middle and ring fingers can curve up and act like a hook, to give it some utility. these can be popped up and pulled back in by a special construct inside the arm, moved by whats left of his muscles. the fist is very heavy and tough, making it ideal for punching combined with his super human strenght.
-cannon fist: his most fearsome weapon, the cannonfist is exactly what its called: a cannon attached on his arm. this cannon does not use cannonballs, instead it uses an insane amout of gunpowder to creat a great explosion that is channeled by the cannon. the inside is getting smaller towards the nozzle to increase the power and ensure the blast keeps moving in a line, even after it leaves the barrel. although it only has half the range of a good , reasonably large pistol, it can blast through walls, ship hulls and ships masts. humans will be blown back a considarable distance by the weapon, and the punch from the blast causes effects from bruising to broken bones and battered internals. also, at close range targets can and will, be burned by the heat of th expelling gasses and the friction with the air. it can fire one shot, after wich the cannnon must be reloaded by poring powder in a chamber at the back. the cannon is fired through the same mechanism that activates the "hook" of the steel fist. it also has a special compartiment filled with a strange, volatile liquid, wich is mixed with the gunpowder for the "grand cannon" attack.
leg:
- spring leg: this leg uses an internal spring to give the user greatjumping capabilities. it can be used to dodge or to gain enourmous amounts of speed for an attack. it is made of metal to protect it from damage.
- flipper leg: this leg is specally made for swimming. it is the only part not made out of metal, and therefore much lighter. it is a leg with a foot that has a flipper attached. the foot is conected to the leg with a spring that makes the flippet point in the same direction as the leg when ther eis no force applied to it, meaning that when unnderwater, it behaves as a fish's or scubadivers flipper. its made of wood and silk, the last being based on the superstition that wet silk cant tear. while this is a myth, it is undeniably strong and so usefull to cover the flipper. the design and lightness of this leg, together with his strenght and training, make this guy a very fast swimmer and a dangerous opponent underwater
also, due to the weight of these metal prostetics,the other limbs need to have extra weight to keep the wearer balanced and prevent inyury and disfigurements in the long run. he solved this by wearing a large metal guard over his right lower arm, wich is used to deflect attacks, and a steel reinforced boot, wich also comes in quite handy when kicking.