One-Punch Man: Hero Encyclopedia

One-Punch Man: Hero Encyclopedia (ワンパンマンヒーロー大全, Wanpanmanhīrō Taizen) is the first encyclopedia that went on sale on October 3, 2015.

Content
The first encyclopedia contains information's about the heroes (their up to date ranks and data level), villains, monsters, battles and the general world of One-Punch Man. It also comes with a making of and interview with ONE and Murata, a quiz, a popularity poll for the techniques and scenes, and a fisherman extra chapter. The information on the structure of the Heroes/Hero Association is provided. The information covers up to Volume 9. Genos provides commentary on various fights.

The length of time for a battle is provided as well.

Continuity

 * Armored Chief Clerk is revealed to be a businessman who quit his job to become a hero and paid for his armor with his severance pay.
 * Jet Nice Guy won the lottery and he used his winnings to pay someone to turn him into a cyborg.
 * The origins of certain hero names are revealed:
 * Flashy Flash and Sneck chose their own hero names.
 * Bang's hero name comes from his hair color and fierce fighting power.
 * Lily is Fubuki's personal assistant.
 * Bang invented the Water Stream Rock Smashing Fist while training together with his brother Bomb.
 * Child Emperor teaches classes when he isn't a hero.
 * Spring Mustachio comes from a rich family and works in his tea-shop when not working as a hero.