Revan is regarded as a fictional figure in Star Wars by most historians as of Galactic Empire.
"Jedi holocron gatekeeper Llia Orpin provides an extensive account of Jedi history, including its possible origins on Tython, via series of fables called "the Revan Mythologies." Unfortunately, the myths fail to provide a precise location for Tython and lack corroborating evidence for its existence, making it difficult for scholars to accept her version of history. Most scholars consider the myths derivative of the Qel-Droma Epics, updated to to better acculturate Jedi younglings of the day. Many of the stories in the Revan Mythologies feature a mysterious alien species, the Rakata, as the antagonist. The reptilian species is said to have dominated the galaxy using exotic machinery and hyperspace-capable ships that employed the Force as a power source. Jedi heroes in the Revan Mythologies often discover Rakatan devices of astonishing power and were forced to choose between destroying the devices and being corrupted by their power." (page 91)
The same applies for Ulic-Qel Droma, in which his story was chronicled in the Qel-Droma Epics:
"Empress Teta is a major setting in a series of epic poems set thousands of years in the past that detail the mythical journey of Jedi Knight Ulic Qel-Droma... Historians believe the epic poems taught young Jedi the dangers of the dark side, but some believe the stories originate in historical fact. Archaeological institutes have launched numerous expeditions in vain attempts to verify the legends." (page 61)
The phrase "Revan and Malak" was used sort of synonymous as, like, "badass" by many:
“No,” Han said firmly before anyone else could voice an opinion. “If they get loose, they’ll be coming back here. We stay.”
“If they get loose?” Dozer retorted. “Don’t be ridiculous. Who do you think they are, Revan and Malak? I’m telling you, they’re hammer squash. And so are we if we stay here.”