Starscream is a hero on the wrong side. Over the centuries he's come to believe both Optimus and Megatron have lost sight of what is best for the Cybertronian race, and simply pursue their own agendas. At some point, he came to the decision that, for the good of the species, A new leader must emerge, and he would be that leader. However, over time, he became as corrupt in his own way as Megatron, although he prefers subtlety and deception to Megatron's brute force. Now, what may once have been noble goals are buried under layers of self interest, transforming Starscream into that which he supposedly despised: second-in-command to Megatron.
ALTERNATE MODE
Prior to the events of the first film, Starscream assumed the form of a Cybertronian jet fighter, but upon arriving on Earth, he took on the form of a Lockheed Martin F-22 Raptor, after shooting down a Raptor prototype. The jet's powerful main engines end up on his back, allowing Starscream to leap great heights into the air and take flight, much like a jetpack. They also allow him to control his descent if he transforms out of his jet form in midair. His movements are a combination of acrobatic and avian, grabbing hold of a bridge's bottom to launch himself up into the air and transforming in mid-flight to swoop down upon his prey. His arms store heavy weaponry, with a missile launcher carrying six missiles in both arms, a saw in his right arm, and a high caliber machine gun (probably the jet's Vulcan cannon).
