So my first thought for 'Arm' was again my own character ( sorry for being so lame ). This is the Arm and the Arm of Nikolai Dante, bearing as it does the Romanov Weapons Crest which grants the wielder something like superpowers and in Dantes case Bio-Blades that spring from his hands like organic machinery.
Did I mention that I'm in Peru right now? It's REALLY cool to be able to do this! Haha!