Vladimir Zadornov (Metal Gear Solid: Peace Walker)
Lou Zhenhua (Chaos Dragon)
Cyborg (DC Comics)
Riderman (Kamen Rider)
Barret Wallace (Compilation of Final Fantasy VII)
Inspector Gadget (Inspector Gadget)
Hoss Delgado (The Grim Adventures of Billy & Mandy)
Franky (One Piece)
Scorpion (Marvel Comics)
Phineus Phibes (Shaggy & Scooby-Doo Get a Clue!)
Ustanak (Resident Evil 6)
Venom Snake (Metal Gear Solid V: The Phantom Pain)
Guts' (Berserk) mechanical arm contains a cannon and a repeating crossbow, as well as magnets to allow him to hold his sword.
Wild Dog's (Time Crisis) robotic arm contains a machine gun, a flamethrower, a missile launcher, a grappling hook, and a tractor beam.
Riderman's (Kamen Rider) cybernetic arm can be used for a mace, scythe, scissors, claw, drill, and gun.
The Ustanak's (Resident Evil 6) robotic arm can be swapped out for a telescopic claw, a chain gun, a flail, and a drill.
Warp Darkmatter/Agent Z's (Buzz Lightyear of Star Command) cybernetic arm can morph into a flamethrower, a plasma cannon, and a claw.
Alex Murphy/RoboCop's (RoboCop) attachable weapon arm can be used as a machine gun, rocket launcher, and flamethrower.
Death's Head (Marvel Comics) possesses a liquid metal right arm that can morph into claws, blades, a plasma cannon, and a "Cranial Disruption" that allows him to download an opponent's mind into himself.
Phineus Phibes (Scooby-Doo)
In addition to its primary machine gun function, Barret Wallace (Compilation of Final Fantasy VII) can swap his gun arm for a robotic hand, as well as a drill, a pair of scissors, a chainsaw, and a laser.
Scorpion's (Marvel Comics) robotic tail comes equipped with a stinger, a laser, an electric generator, mace gas, and an acid shooter.
The T-X's (Terminator 3: Rise of the Machines) arms contain, among other things, plasma cannons, flamethrowers, and buzz saws.
Venom Snake's (Metal Gear Solid V: The Phantom Pain) robotic left arm has a variety of different customizations and functions, such as an active sonar, a stun rod, a rocket punch in both lethal and non-lethal variations, and the "Hand of Jehuty," which allows him to snare enemies and draw them to his position.