Cheetor (Armada)

Cheetor is an Autobot from the Unicron Trilogy series.

Armada/Energon Comics
Consumed by the will of Unicron, Cheetor went from being an energetic young warrior to one of the Chaos Bringer's Four Horsemen-- complete with a horse. His former partner, Cliffjumper remained behind on Cybertron and desires to see her partner returned to normal.