What made me interested in G1 is the presentation of different factions aside from the Autobots and Decepticons. Humans - A fractious bunch not really that united. But they did form a mutual defense organization EDC against the Decepticons. Some countries does recognize this organization though. Quintessons - Essentially the Third Faction. Usually has an uneasy alliance with the Decepticons on occasion. But they really want to recounquer Cybertron and retake descendants of their former creations. Junkions - Nominally allied with the Autobots but they are Neutrals in a way. Some of them wouldn't hesitate to trade with a Decepticon. Though they're an Autobot tribe removed from the war they do not possess prejudice against the Decepticons. Unlike the Autobot colony Paradron they are not pacifists though. Nebulons - As of rebirth split between the Hive and the Rebels. Each group picked a side of the Autobot-Decepticon War. Wildcards: Unicron and Vector Sigma respectively. Unicron wants to eat planets thus a threat to all. The only thing that can destroy him is the Matrix. Vector Sigma as shown in Rebirth uses both Autobots and Decepticons to its advantage. Though in context of G1 cartoon while it was the Quintessons that massed produced the Cybetronian ancestors it was Vector Sigma that gave them life and sentience. In this context Vector Sigma went Sky Net on the Quintessons.