sn0wsh00 | Batman: Arkham Knight - Rescuing firefighters with the free roam mod @sn0wsh00 | Uploaded February 2018 | Updated October 2024, 2 hours ago.
Play the Line of Duty most wanted mission with the free roam/character swap mod.

0:00 Azrael
1:48 Bruce Wayne/Hush. Unable to perform takedowns, counters or shield beatdowns
3:24 Catwoman
5:22 Harley Quinn
7:32 Gordon. Unable to perform takedowns, counters or shield beatdowns, but apparently has the power to cause shields to collapse on their own.
10:05 Nightwing
12:19 Red Hood

Free roam mod:
youtube.com/watch?v=dXeJNHHv-qY

Given how some characters don't have grappling hooks, you might need to use noclip to get to get to the rooftops. I made a video with instructions on how to enable noclip here:
youtube.com/watch?v=miNxnjceoP8