If you have a copy of Batman: Arkham Knight on PC that actually kinda works for you and you’re looking to spice things up a bit, a couple modders have something for you.
The mod will let you take any of 10 different characters into free-roam, including, according to the video, Red Hood, Harley Quinn, Nightwing, Robin, Azrael, Bruce Wayne, Catwoman, Commissioner Gordon, Joker and GCPD Officer Owens.
After backing up your saves, you can download the file from the site linked in the description for the above YouTube video and then, at the press of a key, switch to any of the above characters. Characters like Robin and Azrael have capes that allow them to glide like Batman (even if the capes are implausibly flimsy), while other characters are stuck running around. Red Hood has his signature pistols, though Commissioner Gordon does not. He is capable of some pretty incredible acrobatics for a man his age, though.
Aside from a whole pile of skins, this is a fun way to get some extra life out of Arkham Knight… assuming it’s even playable for you and you haven’t returned it.