I'm going to give a tentative yes, on the restriction they cannot be closely connected. I'd rather no one plays both sides of a relationship that defines the narrative, e.g. a fated rivalry or a romance (that's important for character development, something like a married pair where one of the characters is basically an accessory to the other would be a combo app thing). As I reserve the right to decline apps based on that, you might want to run by just who you want to app by me first.

Worst I can do is say no before you bust your hump of two apps and have to pick one.