What is Mister Toussaint’s main motivation throughout the story?

He got his motivation from Loony Goony. His goal was to get rid of Loony goony as fast as possible.

Explanation:

'The Brave Little Toaster' is a science fiction narrative set in the future. It involves advanced technology, non-human objects possessing human qualities along with the human characters to show the consequences of excessive advancement in technology.

As per the question, the key motivation that drives Mister Toussaint's action in the story is Loony Goony. Loony Goony is a kind of unhealthy energy drink that can be classified illegal by the police on being microwaved. The devices in his house get messed up by a trick device and thus, he uses Loony Goony to fix that up but eventually led him to get arrested by the police. Thus, he wishes to get rid of it as early as possible.