Share Play

A share play functionality would be cool. If you wanted to play with a friend as if you were beside each other such as versus in Street Fighter/Mortal Kombat (if they don't own it) or to play co op on a game. This would be especially good on games that don't have online servers such as Overcooked 1, you could pass the keyboard/controller.

Essentially what PS has right now just built into the Discord App with keyboard and mouse as well as controller support.