Gyakuten Saiban: Yomigaeru Gyakuten Investigate into the TRUTH is an official guide for Gyakuten Saiban that was released only in Japan. It features miscellaneous information about the characters from the first game, including heights of the characters.
The following images are scans from the official guidebook in Japanese.
The following images are manga scans found in the guidebook and translated into English by the members of Court Records. These are short parodies of The First Turnabout, Turnabout Sisters, Turnabout Samurai and Turnabout Goodbyes, all of which have no bearing on the cases whatsoever. Note that the third comic is not translated according to localization.
Despite being manga, traditionally read from right to left, these comics are read the Western way, from left to right.