Prior to the series
At one point, Ronin broke into the library and stole the scroll of Airjitzu.
Weeks later, Morro visited the library seeking the scrolls but stormed out after he learned of the theft.
Attack of the Sky Pirates (non-canon)
Nadakhan granted Wu three wishes and ultimately imprisoned him in his teapot.
Nya recalls one of the locations in Zane's memory looking like the library.
The ninja tried to virtually search the Library for a book to help them solve the Ninjigma.
Prior to Sons of Garmadon
Harumi got Hutchins to take her to the library under the guise that she simply wanted to study Ninjago history, where she read about the Oni Masks and the resurrection ritual that could summon Oni from the Departed Realm. From there, she got the idea to form the Sons of Garmadon, and bring the Garmadon she idolized back.
- Lloyd (possessed by Morro)
- Wu (in an alternate timeline)
- Zane (in an alternate timeline)
- 46. "Ghost Story"
- 181. "Farewell the Sea" (mentioned)
The books Wu has on his reading list are:
- Mastering Your Bamboo Staff: Attacks and Defense
- Spinjitzu Tornado Techniques
- Tasty Tea Recipes: An Ancient Handbook
- Guide to the Serpentine Tribes
- Mustache Maintenance for Beginners
- The Art of the Silent Fist
- Legends of the Temple of Fortitude