Nova Prime
Nova Prime is one of several fictional characters who appear in the Transformers series, usually in comics storyline. He is often depicted as a Prime who proceeded Optimus Prime and Sentinel Prime.
Transformers: Generation 1
Nova Prime (also called Prime Nova) is usually depicted as an early Prime known, who succeeded Primon and Prima and preceded Sentinel Prime as holder of the Matrix of Leadership. He is a white-armored Transformer, bearing some resemblance to Optimus Prime. His most common form includes large wings/fins in robot mode, with a truck form that includes a trailer; no official toy has yet been created for this form.
Marvel Comics
The Marvel Comics Transformers series named an early Prime known as Prime Nova, who succeeded Sentinel Prime as holder of the Matrix.
Animated series
Prime Nova succeeded Prima as bearer of the Matrix of Leadership through unknown circumstances, and went on to fight against the Quintessons in the robot uprising that ultimately forced the evil aliens off of Cybertron. It is unknown if he died during the rebellion or not, but by the time of the first Great War, he had been replaced as Autobot leader by Guardian Prime. When Rodimus Prime journeyed into the Matrix in 2005, Prime Nova was the third guide that he encountered. Prime Nova related to him the tale of the Quintessons' robots rise to true sentience and life, and their fight back against their alien masters.