Child Of Light
Child of Light is being described as a fairy-tale inspired JRPG.
It stars Aurora, a princess trapped in a waking dream with the power of flight, and her blue orb companion Igniculus.
The game is single-player at its core, but a second player can hop in and play as Igniculus. He can aid in battle, find secret treasures, and by all accounts plays a very important role.