This is a build concept revolving around protecting hostages and using them to your advantage.
Keep edge and grit up to stop any interruptions when using a hostage as a meat shield.
Important skills to note are enforcer aced to get edge and grit easily, solid for stopping interruptions and combat reload to refresh edge and grit.
I highly recommend the burst pistol for this build (though any will do really)

You can find the build here https://www.pd3builds.com/builds/hostage-situation-9398
(It may be subject to change and is more of a concept, but play about with the skills and see what works for you)

Key points to note:
- Plate up and replenish to instantly regenerate chunks when you have edge and grit. These skills go hand in hand with each other as you can merely kill enemies to gain ammo and thus refreshing your armour.
- Enforcer aced to gain edge and grit. Should be self explanatory.
- Solid to stop cops disabling you when you have a hostage. (Note, special enemies like cloakers can still disable you!)
- Combat reload to refresh your edge and grit timers. Always keep them active simply by reloading.
- The manipulator tree can be used if you want to get more resources out of your hostages or even gain additional hostages.
- CQC specialist and assassin for gaining rush to move faster with your hostage.