Marriages in Fire Emblem: Awakening affect the end credits, but also unlock sidequest Paralogue chapters where you can recruit new characters—the married couples’ children.
Fire Emblem: Awakening's world map allows you to visit separate areas unrelated to the story when they open. These lead to Paralogues, which are like side stories.
Naomi isn’t eating, isn’t sleeping, and is more or less catatonic... and talks about a girl who doesn’t exist. A girl who was supposed to be in her class, but no one re.