Ensign Ro - Michelle Forbes

She was the Bajoran with the checkered past who gave Commander Riker more than a little pause when she came aboard the Enterprise NCC-1701-D for a vital mission.  Played by actress Michelle Forbes, Ro Laren - or Laren Ro, since Bajorans use their surname first - would eventually become an important part of Captain Picard's Enterprise.

Guinan and Ro in Ten Forward