Deanna Troi is a half-Betazoid, half-human Starfleet officer serving aboard the USS Enterprise-D. She studied psychology at Starfleet Academy and serves under Captain Picard as a Lieutenant Commander and the ship's chief Counselor. While Betazoids are telepaths, Deanna's mixed heritage limits her abilities to that of an empath, though she can communicate telepathically with other Betazoids and some other telepathic species. Her empathic skills are useful when counseling crew members or assisting with diplomatic negotiations. Prior to joining Starfleet, Deanna was involved in a serious relationship with Will Riker which ended due to Riker's Starfleet priorities. They maintain a close friendship while serving together on the Enterprise, and he mentors her when she takes the command exams to become a bridge officer. By the end of the series, she is promoted to a full Commander.
I grew up watching Star Trek: The Next Generation during its original run and always wanted a TNG-era Starfleet uniform. Although my favorite female character was Beverly Crusher (and I ship Picard/Crusher so hard), I look more like Deanna and liked her character much more in the later seasons of the show when she was promoted, put on a real uniform, and was written as a more fully developed crew member. Traditionally, the mass produced Next Generation uniforms have been atrocious in both color choice and design, however in 2009 Rubies re-released their TNG uniforms for the first time since the show ended in 1993. These uniforms famously had the proper coloring and cut and so I grabbed one. I got the small blue version, which fit perfectly lengthwise but was absolutely huge width-wise; apparently Rubies assumes that all Star Trek fans run wide. Ripping the seams apart, I took in the costume almost six inches on each side of the waist and four inches on the width of each arm. I redid the darts in the front, and added stirrups to the bottom of the pants so that they could wrap around my boots and pull the costume taut across my body like it was designed to be in the show. A magnet communicator pin and metal rank pips round out the look; I thoroughly enjoyed being addressed by "Commander" as opposed to "Counselor" the first time I wore this.