Neptune is the main protagonist of the four Goddesses, and the Goddess of the Gamindustri nation of Planeptune.
This game might be a spin-off, but Neptune's level of positivity in it is equal to that of a mainline title. She's a bright, exuberant leader to those around her and really fills her role as the protagonist of all protagonists. As a lover of anime and the fine art of gaming, she is known to offer witticisms about the world around her.