Tokyo Ghoul Wiki:Character ages and investigator classes

This page collects general information on how to treat character ages from the manga, how to derive the birth dates of characters, and how to treat print errors in the manga.

Deriving birth dates

 * If a character's age is stated in a manga chapter, you can assume that this is the character's age at the time the manga chapter takes place. Together with the birthday, you can derive the character's date.
 * In a character profile in :re, the stated age is always the character's age on the previous April 1st.
 * Alternatively, you might also be able to derive a character's age from their investigator class. With the following formula, you can derive most characters' ages on April 1st: age = year - class + 93 Then, you can use this age and the birthday to derive a character's birth date. This formula is obviously incorrect for characters that joined the CCG earlier than usual, like Juuzou Suzuya or Take Hirako.
 * Finally, we know for some characters what year they are in university or school. Since the Japanese school system is extremely rigid (almost not allowing for repeated or skipped classes), you can also alternatively derive the expected ages and birth dates of these characters from that information and use it in the articles. Note that school and university years start on April 1st in Japan.

Treatment of print errors
Sometimes, the known information about a character's age is inconsistent. In such a case, usually there is one instance of conflicting data. If so, then state the character's age on the corresponding age consistent with the majority of available date.

In other cases, the age formula based on investigator classes might give inconsistent results with the stated age of a character. If there are several characters listed in the profiles in the same volume, the ages are consistently one less than they should be based on investigator classes and April 1st recently passed in the manga, we assume that Ishida missed to update the reference date. In that case, use the age derived from the classes instead or adjust the stated ages by one! Please disregard characters that obviously did not join the CCG at the usual age! If only a single character's age appears off with respect to the class in the profiles, then disregard the class.

Known inconsistencies and their treatment

 * Take Hirako's age in Chapter 56 is inconsistent with his age in Chapter 2 and his profile in Re: Volume 2. His class is also consistent with his age in chapter 2. For this reason, we disregard the datum in Chapter 56.
 * Juuzou Suzuya's age in his profile in Re: Volume 3 is inconsistent with his age in Chapter 47, Chapter 56 and Re: Chapter 12. We follow the age stated in the manga chapters and not the one stated in his profile.
 * The ages of Taishi Fura and Koori Ui are off by one compared to their stated investigator classes, if we assume that the profiles state their age after April 1st. Since April 1st passed during the volume, we believe that Ishida did not update the characters' ages, so either increase the age by one or use the age derived from the classes. Because of assumed consistency within the volume, Hairu's and Kanae's ages have to be adjusted, too.
 * Shiki Kijima's age in Re: Volume 5 has to be adjusted as the ages from the profiles in Re: Volume 4, since Karren's age was not adjusted in that volume and his stated age is also off by one from the one calculated from his investigator class.