Soundwave (Generation One)

Soundave was a major antagonist of th Generation One Transformers cartoon.

Season 1 and 2
Soundwave was one of the first Decepticons and Megatron's most loyal soldier. Denoted by his eerie, echoing monotone, Soundwave regularly gathered vital intelligence for Megatron's numerous schemes with the aid of his faithful and ever-growing team of cassettes, but despite his primary role as a spy and communications officer, he never shied away the battlefield, and would regularly clash with the Autobot Brawn before finding a true rival in his Autobot opposite number, Blaster.

Season 3
He survived the events of the Movie that took the lives of many of his contemporaries, and continued serving under Galvatron in the 21st century.

The Headmasters
In a future timeline that branches off from this one, Soundwave ultimately met his end at the hands of Blaster, but even death could not stymie his loyalty to the Decepticon cause, as he was reborn as Soundblaster through the super-science of the planet Master.