Primus
Primus is, in almost every single continuity, the creator and very living God of all Transformers.
His specific origins vary from incarnation-to-incarnation, but like Unicron, there are many elements which are similar.
Primus is an incalcuably ancient being (almost always the "God of Creation") who battled the Chaos Bringer, Unicron, at the dawn of time. Despite his vast power, Primus was incapable of defeating Unicron, so he outsmarted his foe, trapping them both into large planetoids.
Over time, both Primus and Unicron learned to shape their prisons from within. Unicron used form to become an immense robotic planet which had the ability to change into an immitation of his former self. Primus, in turn, became the mechanical planet of Cybertron. Knowing that his ancient enemy still lived, Primus created a new life-form from the newly created planet. A mechanical creature capable of changing forms, the very first Transformer. To this Transformer, Primus bestowed the Creation Matrix, a tool which contained the very living essence of Primus.
