The Narnia movies are filled with positive messages about selflessness, self-sacrifice, and generosity. The characters, with the exception of Eustace (at first), are brave and want to help the Narnians defeat evil. As each of the main characters is tempted, they learn to make the choices that work for the greater good. Some of the messages could be considered religious, but it's not overt.
The Pevensies and King Caspian and his crew battle the elements and their own fears that turn into reality -- like a giant sea serpent that dozens of men try to bring down with swords and arrows. There's a fair bit of sword play and sword fighting, but no one is killed. On one island, people are "sacrificed" to the sea, so a girl looks horrified as her mother is whisked away on a boat, presumably never to be seen again (spoiler alert: all ends well). A few characters look dead but are actually in a deep sleep. Two characters nearly turn on each other but only because they're under an enchantment. The White Witch appears, but only in Edmund's mind.
In one brief scene, Lucy looks at a couple who are flirting with each other and embracing. A star manifests herself as a beautiful woman, and both Caspian and Edmund look completely taken with her. An ongoing theme in the movie is that Lucy wishes she were as beautiful (and attractive to the opposite sex) as her older sister, Susan.
Some British insults -- like "sod," "what the blazes," "bleedin," and "thick" -- as well as "crap," "shut up," "idiot," "oh God" (as an exclamation), and the like.