Almost all critics agree that Colfer's combinations of technology and fairy tales are the most satisfying element in the novel. By altering traditional Celtic depictions of supernatural characters, Colfer amuses readers with modern versions of ancient figures. These legendary creatures, usually shown to be peaceful, helpful, and kind, are cast as aggressive, self-centered renegades.

Colfer's characters are definitely not whimsical. He interweaves literary genres by equipping fairies and elves with fantastic state-of-the-art technology, most of which surpasses the technical capabilities of real devices available in the early twenty-first century. Coifer also demonstrates that keen intellects can be more effective than powerful technology to survive conflicts. He also shows the power of nature and ancient traditions by mentioning the importance of rivers, trees, and the moon in preserving magic.

Language accentuates Colfer's smart, comedic style. He invents jargon and acronyms, such as LEPrecon, memory swipes, blue rinse...