1. (n) Leader of the Autobots, the protagonist of the Transformers universe. Originally transformed into a red cab-over semi-truck, his form has evolved through the various iterations of the Transformers universe (see Optimus Primal
He is known for his strong leadership and courage and would easily sacrifice himself for the safety of others. His selfless personality is one of many traits that made him a great leader. Optimus Prime could be easily described as a "reluctant warrior", in that he only engages in war when absolutely necessary. It is possible this attitude prolonged the Autobot
He and Megatron
(or his numerous iterations) have always shared a mutual respect for each other, and have opposed each other in nearly every depiction of the Transformers universe.
In the 1986 Transformers animated film, Optimus Prime was killed after a fierce battle with Megatron, but his character returned several times during the series.
Optimus Prime was the most liked character among young viewers of the original series, although his toy was not the highest selling (original release, excludes all others).