Untitled Mr. Men Movie
In February of 2011, some websites were reporting that there would be a Mr. Men Little Miss film being made by 20th Century Fox, it was also going to be produced by the producer of a Netflix show called Stranger Things named Shawn Levy. When it was announced, there was no director or writer during the production of the film.
In December of the same year of 2011, Sanrio - the Japanese company behind Hello Kitty - bought the Mr. Men Little Miss franchise from the now bankrupt and later defunct Chorion.
In early 2015, 20th Century Fox has been securing the rights to the movie and it was still in development it was still the same from when it was announced back in the year 2011, Shawn Levy was still the producer, and there was still no director or writer.
In the year 2018, 20th Century Fox was bought by Disney and the production of the film may have been cancelled, and then Shawn Levy worked on being a producer on the famous Netflix show called Stranger Things. 
The plot is unknown.
Why It Could Be Cancelled
- The only main reason right now is that Walt Disney Studios bought 20th Century Fox at the end of 2018.
- 20th Century Fox was purchased by Disney.
- Shawn Levy later went to become a producer on the famous Netflix show called Stranger Things.