Background
Unicorns in Narnia carry an air of nobility, purity, and splendor. Lewis uses them sparingly, which helps preserve their force. When a unicorn appears, the tone usually shifts upward. The creature feels rare, honorable, and very old in the best sense.
How the Race Functions in Narnia
In the Chronicles, unicorns tend to stand near kingship, loyalty, and holy seriousness. They are not decorative creatures drifting through the background. They usually appear where the moral stakes are high and where unwavering devotion to Aslan or the rightful king is being tested.