If your talking about the shape shifting robots, they were created on cybertron by the quintessons. ^Only in the 1980s G1 cartoon continuity. In more or less all other universes in the transformers multiverse, they were created by the god Primus.

In the original cartoon Blitzwing is a triple changer and pretty much just your average Decepticon grunt. In Season 3 he helps Rodimus Prime defeat Galvatron and the Quintessons and is kicked out of the Decepticons. In Animated Blitzwing is still a triple changer though now he has three personalities as well he comes to Earth with Lugnut in search of Megatron who has been missing for the past fifty Earth years. Towards the end of Animated Blitzwing is captured by Sentinel Prime and Lockdown.