@Demonee That’s just the pattern on the back. It looks nothing like the font used for designating EX-ARMs. Besides, we see that EX-ARM 11 is the right forearm, so there’s no reason why the number would be on the back. And it’d also make no sense, because that would just be a huge risk. They (well, Shiga) don’t trust Akira, seeing as how there’s a restraint on his hacking abilities. No one wants an EX-ARM going berserk and tearing the city apart like back in 2020.
On their own, EX-ARMs are already OP, but they become even more so when pushed to their limit:
• No. 17 can focus a huge blade that sliced a whole mansion in half.
• No. 13 got an upgrade, when Elmira merged with the Bipod, being able to activate multiple crosshairs. It’s currently obliterating Tokyo with it’s “Emergency Mode”, random Spacial Displacement.
• No. 00 possesses insane hacking capabilities.