Hal

Hal is a character in the movie WALL•E.

WALL•E[]

Hal is a cockroach that is WALL•E's obedient friend and pet on Earth, with an appetite for Kremies and extreme physical resilience.

For most of the film, Hal was ordered by WALL•E to remain on Earth. Otherwise, he serves as WALL•E's company on occasions.

Although Hal is never referred to on-screen by name, he is named after producer Hal Roach. This also provides homage to 2001: A Space Odyssey’s HAL 9000.^[1]
The chirps that Hal makes were created by speeding up sounds made by a raccoon.
Hal and the Kremies he eats/sleeps in references the myth that roaches and Twinkies (what inspired Kremies) are the only things that can survive the apocalypse.
Hal makes a cameo in Ratatouille.
Hal also makes a cameo in Wreck-It Ralph, when Ralph looks for a medal in Tapper's washroom.