|Wrong kind of companion|
|Wrong Last Guardian|
In these ways, the boy and Trico make a team, each one requiring the assistance of the other. He needs your guidance and stealth; you need his strength and size. Without each other, neither of you would escape. It is in this way that the emotional connection will be established. Unfortunately, I think Penny Arcade has this one called already.
These games all use (or will use) the gameplay mechanic of a companion as a way to strengthen the story and the player's connection to the world. Many games play out like movies with inconsequential action segments. It's perfectly fine for that to be a basic blueprint for how games function, but it's very important for the gameplay portion of the game to complement the narrative to produce a strong emotional reaction. Letting the gameplay and the story work together instead of side-by-side is an option that video games have which makes them unique as a storytelling medium. Taking advantage of this ability is how video game makers can advance video games as an art form.
How else have you seen gameplay enhance the narrative? I'm personally looking forward to Journey's desolate world exploration and unique co-op.