STAR WARS BAD BATCH: OMEGA
Omega was an unaltered female clone--meaning she had not received the accelerated aging mutations that her clone brothers did. The only other clone of this nature is Boba Fett, scion of Jango Fett. Jango Fett provided the genetic blueprint for all of the clones in the Grand Army of the Republic.
A fast learner, Omega was sheltered on Kamino--a watery planet--for most of her life under the tutelage of Nala Se. She matched her brothers in intelligence, leadership and marksmanship skills. After the events on Mount Tantiss 19 years before the Battle of Yavin, Omega "retired" to Pabu with her brothers Hunter, Crosshair and Wrecker.
She rejoined the fight a year before the Battle of Yavin; her whereabouts afterwards, like her brother Echo, are unknown.