Siren

Sirens are people who have been altered by alien technology into an enhanced being with superhuman abilities.

Sirens
There are reportedly six Sirens in existence at the time when the events of Borderlands take place. The player character Lilith is one of them, and her history involves searching for another whom she believes to be on Pandora. This Siren is speculated to be Commandant Steele, due to their similar tattoos and appearances.

In Borderlands 2 there will be a new playable siren called Maya.

Abilities

 * Lilith has the ability to Phasewalk through another dimension for a short period of time. It is unknown whether other sirens share this ability or have other similarly powerful talents.

Trivia

 * In Greek mythology, Sirens were three dangerous women portrayed as seductresses that lured sailors to their death with their singing. This is reminiscent of Lilith, as she is often portrayed as a seductress as well.