4K Arknights: Chen, Hoshiguma, Bison, and another character HD Wallpaper

Four anime characters with horns are gathered in a gritty, urban environment. One character in the foreground has dark blue hair and is wearing a black outfit. Another character with green hair is sitting on a raised platform, looking to the side. A third character with grey hair is seated in a vehicle, and a fourth character is partially visible in the background.