Solution to Foundation's Collection

The information in this puzzle is presented as a set of twenty articles written in the style of the SCP Wiki. Whereas the original SCP Foundation has a mission to Secure, Contain, and Protect its large collection of entities that defy understanding, the Foundation in this puzzle has a mission to Shelter, Care for, and Protect its collection of entities instead. Every article is about a fictional character, and contains the following common sections:

• Item #: A redacted number used to refer to the character, with at most four digits.
• Object class: A single word related to the character’s franchise of origin.
• Special Care Procedures: Instructions on how to care for the character, i.e. shielding them from canonical threats and assisting them with goal realization.
• Description: An account of the character’s physical appearance, date found (more on this later), abilities, and history; contains several redacted keywords each with a highlighted letter.
• Tags: Aggregatable properties of characters such as object class, gender, and combat characteristics, usually a rehash of information from Special Care Procedures and Description.

By combining the information provided, solvers can identify the characters and fill in the redacted data. The characters are in sorted order by first name. Once the highlighted letters within the data are identified, they spell out a keyword related to the character, but with one letter missing.

Together, the missing letters in the keywords spell GOOD SMILE DIFFERENCES. Good Smile is a company that produces figurines, in particular the Nendoroid series wherein every figurine is given a chronological ID number with at most four digits. This points to the fact that the Item # is simply the character’s Nendoroid ID, and the Foundation’s collection in this puzzle is actually a Nendoroid collection. Some characters are re-released as variants with different Nendoroid IDs, hence the articles for Hatsune Miku and Levi Ackerman have an Addendum section to clue which variant’s ID to use. Furthermore, the many dates and non-redacted Item #'s throughout the puzzle now make sense, and can be used to accelerate or double-check the identification process.

The next step is to figure out which differences to take. When sorting the Nendoroid IDs, solvers can notice that the IDs come in pairs that differ by a small number, which is always less than 26; meanwhile IDs in different pairs always differ by more than 26. This suggests that for each pair, the smaller ID should be subtracted from the larger ID.

Hence we get the clue phrase DULLAHAN E.G., which we can combine with the enumeration (8,8) given by the redaction boxes at the bottom to get the answer HEADLESS HORSEMAN.