The Remans are a humanoid species from the planet Remus. They are slaves to the Romulans since at least the 22nd century.
The Remans reside on the dark side of the planet. They are extremely sensitive to light.
Some Remans, maybe all, possess telepathic abilities. These powers are extremely powerful and can be used to get inside the mind of another.
The Remans are great warriors. They were used as bodyguards for Romulan senators. They were also used during the Dominion War during the fiercest engagements.
In 2379, the Remans gained power in a military coup. They placed a cloned copy of Starfleet Captain Jean-Luc Picard as the Praetor of the Romulan Senate. Shinzon nearly destroyed Earth and start a war with the Federation.