Over the years my comic-collecting habit has taken me down some weird alleys, and 'Ninjago' material is one of those neat, nostalgic corners. Officially published comics, graphic novels, and tie-in books for 'Ninjago' are almost always targeted at kids and teens — bright art, straightforward plots, and little to no explicit content. If you're browsing mainstream shops like Amazon, big bookstores, or the publisher's catalog, that's the vibe you'll find: family-friendly adventures and lore-expanding side stories meant to support the show and toyline.
That said, mature takes do exist — but not as licensed, widely distributed books. Most of the darker, romantic, or otherwise adult-themed comics are made by fans: zines sold at conventions, doujinshi on creator platforms, or digital releases on places like Gumroad and specialized artist shops. These are unofficial, carry their own age warnings, and sometimes get pulled if they step on intellectual property toes. If you're hunting, look for explicit tags and read previews closely; I treat these works like hidden gems or
Guilty Pleasures and enjoy them when the creators handle characters with care and depth.