Meet the Inquisitor in Dragon Age: Inquisition
We're all aware that the co-op and single player campaigns of Dragon Age: Inquisition are locked away in separate rooms and refuse to make eye contact. Bioware is probably pretty cautious of having the two interfere after the unfortunate backlash they got from Mass Effect 3's multiplayer influencing the traditionally single player experience. Of course, the two modes still exist in the same game world, even if they aren't going to acknowledge each other.