Toaster is a (presumed) Autobot from the Generation 1 series.
Toaster is the brother of Autobot communications officer Blaster and the sister of Karmen. He transforms into a toaster.
Fiction
Marvel Generation 1 Comics
Toaster was only directly referenced once. Blaster, at the time the letters page host of the UK comic, told an interested letter-writer that he had a brother named Toaster who transformed into a toaster and whom he liked first thing in the morning.
There are at least two possible visual appearances of Toaster. There is a flashback to the reconstruction of the Autobots by the Ark in which one of the disguise choices displayed is a toaster. There is also a large (Transformer-sized) toaster in the pile of dead bodies upon which Galvatron is standing in a cover depicting his maddened memory of victory at the end of Time Wars.