Reva is a character in the Star Wars comic book series, specifically in the Darth Vader: Dark Lord of the Sith arc. She is a member of the Inquisitorius, a group of Force-sensitive individuals who serve the Galactic Empire by hunting down Jedi survivors of Order 66.

In the comics, it is revealed that Reva is aware of Darth Vader’s true identity as Anakin Skywalker. The revelation comes during a confrontation between Reva and Vader, in which she questions his loyalty to the Emperor and accuses him of being a traitor.
The explanation for how Reva knows Vader’s identity is not explicitly given in the comics, but there are several possible explanations.
First, it is possible that Reva has simply put two and two together based on her knowledge of the events leading up to the rise of the Empire. In the Star Wars prequel films, it is shown that Anakin Skywalker was a powerful Jedi who fell to the dark side and became Darth Vader. It is also revealed that Vader served as a key enforcer for the Emperor during the early days of the Empire.
As a member of the Inquisitorius, Reva would have had access to information about the Jedi Order and the events of Order 66. She would have also been aware of Vader’s role within the Empire, which would have given her some insight into his true identity.
Another possible explanation is that Reva has some kind of Force ability or sensitivity that allows her to sense the truth about Vader. In the Star Wars universe, some Force users have the ability to read minds or sense emotions, which could potentially allow them to uncover secrets that others might miss.
In the comics, Reva is shown to be a skilled fighter and strategist, and it is possible that she possesses some kind of special Force ability that allows her to uncover the truth about Vader’s identity.
Finally, it is also possible that Reva has been given information about Vader’s identity by someone else within the Empire. In the Star Wars universe, it is not uncommon for different factions within the Empire to have their own agendas and motivations.
It is possible that Reva is part of a group within the Empire that is opposed to Vader and is working to undermine him in some way. In this scenario, Reva could have been given information about Vader’s true identity as part of a larger plan to bring him down.
Regardless of how Reva knows about Vader’s identity, the revelation has significant implications for the character and for the wider Star Wars universe. For Vader, the knowledge that someone within the Empire is aware of his true identity adds another layer of danger and complexity to his already complicated situation.
It also raises questions about how many other individuals within the Empire are aware of Vader’s true identity and what impact this knowledge could have on the balance of power within the Empire.
For the wider Star Wars universe, the revelation that Reva knows about Vader’s identity adds another piece to the puzzle of how the events of the original trilogy came to be. It also helps to flesh out the world of the Star Wars comics and to add depth to the characters and factions within the Empire.
In conclusion, the exact explanation for how Reva knows about Vader’s identity is not explicitly given in the comics, but there are several possible explanations. Regardless of how she knows, the revelation has significant implications for the character and for the wider Star Wars universe, and adds another layer of complexity and danger to Vader’s already complicated situation.