Marvel Encyclopedia Vol. 2: The X-Men is broken down into several sections, covering the thematic sections of the X-Men Universe, including the main team, the spinoff teams, supporting characters and villains. Within each section, the major characters and supporting characters are ordered alphabetically, with their corresponding villains following, also in alphabetical order. Each section carries a brief two-page introduction. Each character with an entry is granted either two pages or one, or is included in a section of mini-biographies. The information includes a basic history of the character; biographical information such as real name, first appearance, height, weight, eye color and hair color; a breakdown on powers and weapons used by the character; and a power ratings grid that measures their intelligence, strength, speed, durability, energy projection and fighting skills. There is also a box that directs readers to essential collections that feature the character's most significant moments. Interspersed with the text material are heavy doses of previously released artwork from today's hottest Marvel artists.