Ok to summarize the whole thread
Animations
Animations like Narrator and Marilla are official and can be used as secondary material.
Books
Books that tell a story like Mob Squad are treated as Minecraft: Story Mode where Minecraft is canon to them but they are not canon to Minecraft or Dungeons or Legends (This can change depending on if anything is found that ties it to the true minecraft canon obviously)
Books like Minecraft Dungeons: The Rise of the Arch-Illager and Minecraft Legends: Return of the Piglins are canon to their respective games.
Guidebooks and similar like the Mobestiary and
Blockopedia can be used to Main Canon
Marketplace
Marketplace will only be taken into account if it has enough of its own material, it does not count if they are only Skins and that's it, they need to be a complete combo with a small narrative even if it is, such as the Megaman Marketplace that includes several levels, a mission to defeat the plan of Sigma and various characters
The Marketplace of random people who are not directly sponsored by Mojang is not accepted, This can change if their Marketplace are on the Official Minecraft Channel many times
While Marketplaces made by people who have actively collaborated with Mojang on their crossovers and others things, can be used, these groups would be for example Cyclone who made Minions, Pixar's Lightyear & DuckTales DLCs or Game Mode One who collaborated on the creation of Minecraft's Sonic, HTTYD, PAC-MAN & Bloom
a couple of examples of Marketplaces that are allowed, although there are many more than are allowed I just won't go looking for everyone, because it will take Time;
Minecraft X MegaMan X, Ben 10, Burberry, HTTYD, Avatar, StarWars, Spongebob, Batman, lightyear, angry birds, ice Age, the mangrove restoration project, Ultimate Dragons, Sonic, Minions,Terra Swoop Force, Ducktales, We Are The Rangers, ARTEMIS: Rocket Build, Frozen Planet II, etc