I have always liked books that give you something extra. Sometimes I really get into little facts and minutiae that have little bearing on a story.
That's why I wrote so many pages worth of extra content from I, Crimsonstreak. To be honest, I probably went a little overboard on the appendices. I didn't want to get involved in info dumping or spend too much time talking about the histories of individual characters.
The appendices were my way of solving that problem. I tried to give the information that people needed in the main story without getting bogged down in the details. If you wanted to, you could read the extra content and get a better sense of the Crimsonstreak universe.
I like it; I think it was successful. I've heard that perhaps it was too much. People finished the book and had a good chunk left to read. This left them confused; they thought the book was over.
I, Crimsonstreak 2: II Crimsonstreak: Chapter IV: Episode XII: Revenge of the Kiltechs and the Wrath of Morty will indeed feature appendices. I'll have newspaper articles and bios on some of the characters; I may even have a magazine feature or two up my sleeve.
This time, though, I'll take it easy. The sequel is about 10,000 words longer than the original novel, so I'm going to halve the amount of extra content. I'm looking in the ballpark of 7,000 to 9,000 words.
Lean and fast, baby.
Just like my Crimsonstreaking hero.