Neptune and Plutia are very close friends. Neptune enjoys lazing around and napping with Plutia. Plutia generally follows Neptune's advice since Neptune is a bit quicker when thinking. Plutia feels due to Neptune's ability to make friends, playful and outgoing personality, Plutia, herself was able to make friends. As such, she feels grateful to Neptune. However, like everyone else, Plutia's transformation scares everyone, Neptune included.