The latest SHIELD Hub update adds the ability to use multiple controllers during GameStream. This will allow for local multiplayer while streaming PC games.
Games mentioned among many others that will work with this update include LEGO Marvel Superheroes, Ultra Street Fighter IV, and Gauntlet. In order to get this update, available on both the SHIELD Portable and SHIELD Tablet, you can either download it from Google Play, or wait for the Hub to auto-update.
GameStreaming is one of the best reasons to own a NVIDIA SHIELD device, and updates like these only add to the fun. A GeForce Experience update is also available now to go along with this update.