Blurr is either ArmadaBlurr, a Velocitronian, or one of one of several Autobot civilians in hiding on Earth, depending on who one asks.
Voice actor: ? (English), ? (Japanese)
Blurr was seen as one of several Autobot civilians forced into hiding on Earth when the Unicron Singularity threatened Cybertron. After adopting native altmode forms, Coby Hansen spent some time with them, teaching them how to obey traffic rules and blend in.
Blurr has a handful of friends in very similar altmodes in varying color schemes.
Blurr has two separate Hasbro-written profiles, both of which contradict his appearance on the show. The first one  was written at a point in time when he was to come with Buzzsaw in a two-pack, and characterizes him as the character from Armada. The second  was published on his packaging and describes him as a native Velocitronian.