Homestar tries to read, and sometimes he does think it's fun, but most of what he reads falls under the category of computer words or nutritional information. He will surprise you with the occasional random, obscure fact that could only have been found in a book, but this was likely read to him while hang gliding or barefoot trick water skiing or something that makes it more interesting than just reading, thus aiding his memory.

Mia, in canon, is considered one of the most voracious readers in her entire city and, due to the small amount of libraries in Lunar, likely the world. There are only three people in canon who are known to have read more than her: Ghaleon, Damon the Keeper of Knowledge, and Lemia Ausa. In Millicanon, she's been reading a lot of Earth books. Mostly poetry, Robin Hood stories, and Arthurian legend.

Farley has more important things to do than read in a city where everyone is so wrapped up in television that they live in the studio. The only things he reads are scripts and the ratings.