The Fallen Friends

One of the first 13 Transformers created by Primus. He was the first who had shape-shifting abilities.

The first Emperor of Destruction of the evil race of robots known as Decepticons. He hates Autobots and their leader Optimus Prime.

A member of the Decepticons and Predacons.

Part of the Decepticons who is the Most powerful of the Seekers. Starscream is usually the scheming second in command to Megatron. Ultimately joined the Autobots in the Armada continuity. In the Prime series he is described as dead to the Decepticon cause by Megatron, but has really gone rogue.

Unicron is a Transformer that is the size of a planet. He is an evil being able to destroy/devour planets. He was created by Primacron in the cartoon using a node of Vector Sigma as a template. In the comic origin he was a god.