A dancing girl was the title held by a Breen thot serving as entertainer for q and the guests of his birthday celebration in the 25th century. (STO - Anniversary Event mission: "Omega Molecule Stabilization")
From 2409 onwards, q became involved with officers of the future Khitomer Alliance, the way his father Q had had an interest in certain Starfleet captains. Among the events q held for his own amusement and that of the lesser creatures, he celebrated his birthday every year. Due to q transcending the space-time continuum, he had celebrated it ten times by the start of 2411.
During the event, q would appear on a judge's throne and in appropriate attire, flanked by a pair or more of dancing individuals, in two locations. On Deck 47 of Earth Spacedock, q's dancing girls were a pair of Fek'Ihri slavemasters. In front of the Great Hall of the First City on Qo'noS, a pair of purple-clad Breen thots provided the entertainment.
When an officer accepted to join q's "game" of stabilizing omega molecules across local space, they would be transwarped to stand in front of q and his throne on either ESD or Qo'noS. (STO - Anniversary Event mission: "Omega Molecule Stabilization")
Breen dancing girls, like their Fek'Ihri counterparts, cheerfully performed a variety of dances while flanking q's throne. These particular Breen thots were taller than an average humanoid and wore a fully equipped adaptation suit, including a Breen 3 helmet, shoulder pads, boots, and a large backpack. Unlike regular thots operating in the Breen Militia in the 2400s and 2410s decade, the Breen dancing girls' adaptation suit was pink, with accessories like the backpack colored purple. The visor color was a dark yet intense pink, like adaptation suit visor color A8 or slightly brighter. (STO - Anniversary Event mission: "Omega Molecule Stabilization")