Bookworm

The Bookworm is a character in Toy Story 3.

Toy Story 3
Bookworm is a worm toy with a built-in flashlight. He started out as a minor antagonist, but reformed at the very end of the film.

He keeps a "library" of sorts in a closet at Sunnyside which holds instruction manuals for many different toys, including Buzz Lightyear. He gives Lotso a manual to reset Buzz, turning Buzz evil as well.

Later, after Bookworm hands "Spacesuit Ken" (unaware that it is Barbie in disguise) a Buzz Lightyear manual, he reacts with disgust when he discovers that "Ken" is actually wearing high heels.

After Lotso is removed from Sunnyside, it can be assumed that Bookworm has reformed, as with the case of the other Sunnyside toys who has previously worked under Lotso. In the end credits, Bookworm is seen using his flashlight to light up a disco ball when a disco is being held in the Butterfly Room.

Toy Description
From Official Website:

"Story time becomes extra special when Bookworm joins the fun! This bedtime reading companion encourages your children's love of reading, while keeping them company with his happy smile. Bookworm's sturdy purple flashlight features an extra-long-lasting light bulb, bright enough to read by without causing eyestrain. Two C batteries included. Ages 4 and up."

Trivia

 * Bookworm appears to have been based on the Glo Worm toys of the 1980s.