Naruto Secret: Scroll of Facing Character Official Databook (Hiden: Rin no Sho) is the inaugural
The databook lists the "Summoning Jutsu" as a high-level Ninjutsu (B-Rank). But it also shows early drafts of character designs. For instance, Tenten originally had a different weapon loadout, and Rock Lee’s eyebrows were less pronounced. These production notes are only available in the PDF scan or physical book—not on the wiki.