Pyrostorm

Pyrostorm was a member of the Mini-Con faction on Cybertron, albeit one of the few Decepticon-allied Mini-Cons; the other being Laserbeak. During the final days of Cybertron, Pyrostorm was bribed by Moltenstorm into serving the Decepticon Cause. Despite his allegiance to the Decepticons, Pyrostorm provided information to the Autobots that the Decepticons were building a ship of their own to follow them off the planet. The Mini-Con travelled to Earth alongside his Master and the other Decepticons, only to abandon the Decepticons when Moltenstorm betrayed them. Pyrostorm briefly clashed with Starscream, who thwarted the early stages of Moltenstorm's plans.

Sometime later, Moltenstorm and Pyrostorm moved to the Moon with an army of Predacons. At some point, the Mini-Con was killed by Moltenstorm to restore Unicron's motor functions. Apparently, Pyrostorm transferred his neural transmissions to another blank body somewhere on Earth (presumably from the Nemesis) and escaped. In his search for a supply of Energon, Pyrostorm was confronted by Starscream, who assumed he was on a mission for his "Predacon Master." Pyrostorm told the Air Commander that he had abandoned Moltenstorm and agreed to serve the former Decepticon First Lieutenant, on the condition Starscream help him eliminate Moltenstorm. Following the Autobot strike on the moon and a final battle with the Predacon, Pyrostorm remained loyal to Starscream, as the Seeker showed no hostility to the fortunate Mini-Con.

Pyrostorm would thankfully die during his former master's last stand, the two would be merged together and the pair would then lose their life-force each. Ironic how Pyrostorm wanted to kill Moltenstorm but committed suicide by powerlinking with the God-Like Moltenstorm.