Gotham Knights will allow you to play as 4 member of the bat family with Nightwing, Robin (Tim Drake) Bat Girl and Red Hood. Well you four to chose from the co op only allows you to use 2. Well the developers explain why that is the case.
“You can have four-player brawler experiences, [but] I think the more you try to lean into that, the more you end up having to create environments that only really work for that. And if you look at the fantasy of the Batman family and when these heroes get together, it is often weirdly kind of a drop in drop out scenario. They’ll, they’ll be running, rolling their solo crime-fighting efforts, and then they’ll cross paths and it’ll turn out they’re after the same guy.
And, you know, they kind of joined forces and they take that on and then go their separate ways or decide to team up some more that’s all possible in the current dynamic. Focusing more on the idea of the immediate team-up of two allowed us to say, ‘OK, we can build a world that works perfectly well for either solo play or pairing off.
Because the characters are so distinct from each other, there’s a bit of asymmetry, a bit of the complementary skillset and ability set that actually makes teaming up kind of awesome if you happen to have different characters. Now, if you happen to have two Batgirls, you can also do that. Obviously, the potential of having different Batgirl builds, and how they look different and play differently is really cool too.”creative director Patrick Redding

Article:https://comicbook.com/gaming/news/gotham-knights-video-game-spoilers-2-players-co-op/
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