Tex is portrayed as one of the most lethal and skillful characters in the series, due to the fact that she is a Freelancer and possessed the Omega A.I. which adds to her aggressiveness and abilities. With her training, she is the most competently lethal member of the Blood Gulch cast, along with Sheila (who is literally a tank).
Unlike most of the other Freelancers, who usually relied on their A.I.s to perform certain tasks, Tex preferred to depend on her power alone. Despite being in possession of the Omega, she neglected his power, preferring to rely on her own abilities. Even without using her A.I., she is still easily the most powerful Freelancer agent.
Chronologically first appearing as the "new recruit" of Project Freelancer during Season 9, Tex's level of skill is considered in a completely different league than that of the other Freelancers, even Agent Carolina. Her backstory and previous relationship with fellow Blue Team member Church are key elements in the plot.
Many of Tex's decisions and actions throughout the series, as well as prior to the series, has paved the way for many important events in the series. This also goes the same for some major characters, which she has greatly impacted in either a positive or negative way. This includes, but not limited to, her impact on Carolina and the Reds and Blues' many confrontations with O'Malley.
Her real name is "Allison", but she is commonly known as Tex. Like Church, she had also "died" in the first season and it was revealed that she's not a ghost, but in fact another A.I.