Optimus Prime, leader of the Autobots, is always brave. He will never retreat from a battle unless necessary to save an ally's life. His main weapons are an ion blaster formed from his truck ladder, and his hand, which transforms into an axe that is made from energy inside his arm.
Optimus Prime became the leader of the Autobots when Megatron killed Cybertron's three rulers. He sent the Key to Vector Sigma to earth, alongside two fake keys.