Like a graqeling hook device that allows you to swing around like spiderman if you so wished and that does not have the "Graqel points" seen in arkam asylum, you should be able to use it anywhere and on anything ( Enemies, bounties, buildings, flying ships, trains) More like the device that the predator uses in the avp gold bonus missions or the web from spiderman two.
Or an energy shield mounted on the wrist (like a jackal shield from halo) That can be used as a mellee weapon and in conjunction with the pistol
or perhaps a sword? Or mace? Or variety of such things to replace the wrench? ranging from a pipe to an exploding mace or long metal knives of alien origin too a claymore version of the dragon's tooth sword? Maybe even something like a fist enchancer or a javalin or a crab claw or a metal pincer or a tentacle or lazer glaive... With the ammount of different cultures in the city you should expect some variety in what they use .
I am not even suggesting that all these weapons should be usable by the way. I think most of them of reasonable size should be.. but picture the enemy variety! Lowly thugs of a tribal race using assortments of curved knives that are too low tech to be discovered or blocked by security systems whilst large brute mini-bosses try to block you in heavy armour and with powerful swords that can cut through concrete like air. Police using electric shields and batons to subdue people or monks who use staff weapons- anyway- One enemy type (gun) can get boring and variety is a spice
Perhaps a cannon that shoots a slow moving ball that stuns and electrocutes all in proximity to it? This weapon would be very powerful but easily avoidable and thus would be a fun gameplay device in chases
Exploding darts in different varieties (Frag, poison, plasma) (functions like the "exploding crossbow bolt) ( upgrades with magnetism?)
