From Brickipedia, the LEGO Wiki

Notability is used to determine whether something is worthy of having its own article or not. To warrant an article, the topic should meet one of the following criteria:

  1. Any product released by LEGO
    • Note that in some circumstances, some items may be posted on one page for the sake of convenience or easy accessibility.
  2. All minifigures released in official form.
    • Variants of minifigures go on the same article.
  3. All LEGO parts.
  4. Any playable character in a LEGO online or video game.
  5. Any characters in video games, films and other media who play a role deemed important or noteworthy.
  6. Any product based on a LEGO brand, which is officially approved by LEGO.
  7. Any people or companies who have a notable association with LEGO.
  8. Any places based on the LEGO brand.
  9. Any other items considered important or noteworthy.

Note that in numbers 5, 7 and 9, noteworthiness and importance is subjective. If the importance of an article is challenged, the community shall discuss it and resolve the matter.