Kids can learn about self-awareness, sacrifice, and courage through Darren transformation's from regular teenager to half vampire. Crepsley, despite being centuries-old and curmudgeonly, demonstrates the importance of not being completely self absorbed. Together, and with the help of the circus folk, they triumph over a looming threat.
Although many of the fight scenes are slightly comic, there's plenty of violence, including stabbings with knives and swords, fistfights, kicking/stomping, slashings with vampire nails, and the protagonist having his neck broken for the sake of faking his death. Most of it isn't gory or bloody (surprising for a vampire movie!), but it's still fairly dark. There are also possibly disturbing scenes of the titular "freaks" (a girl with a monkey tail, a boy who's green/scaly like a snake, a man with two bellies, a woman who can rip off her limbs and regenerate them, a man with no skin covering his lower abdomen/ribs, a Bearded Lady, and more.). And those who are afraid of spiders will have several "look away" moments.
A couple of embraces and kisses between Crepsley and Madame Truska (as well as a joke about her beard growing out as a sign of arousal) and Alexander and Jane. Chaste flirting between Darren and Rebecca and a lips-only kiss (which does make her monkey tail stand on end...).
Several uses of the word "s--t" and its cousins "bulls--t" and "holy s--t/crap," as well as a few utterances of "a--hole," "ass," "hell," "dick," "oh my God," and milder insults like "jerk," "wimp," "stupid," and "idiot."
Drinking, Drugs & Smoking
Adults and vampires drink socially on a couple of occasions.