Kate_

Kate is a naga (obviously), who is trained thoroughly all sorts of martial arts; but it's a bit easier to just call her a ninja ^_^; or, Naja, as I not-so-cleverly put it. She is a member of The Convent of Shadows, a secretive sect which hires out it's members as bounty hunters, assassins, or bodyguards to the wealthy or worthy.
Kate is generally regarded as a stealth assassin, but possesses great skill in all areas of combat, and doesn't absolutely need the element of surprise to take out her marks every time.
Personality wise, she is extremely loyal to the Convent and it's Master. She is often cold to others out side the Convent, however, preferring to work alone. But, when teamwork is a must, she will begrudgingly work with others for the good of the Convent.
Being a naga, her natural abilities are of great use to her. She is agile, quick, precise, and cunning. She also has the ability to recognize heat signatures, much like a pit viper. This allows her to have an advantage during the night, or any other time when she and her enemies are in the dark.
As far as weapons go, Kate always has her two main stilettos on her belt, and is most comfortable using them. When the situation calls for it, however, Kate is also skilled in the use of many other weapons, including bows, katanas, throwing blades, and more. An odd quirk: She absolutely cannot use nunchaku, she tends to just smack herself in the face if she tries.
Being a decent size naga (her human torso is just a bit bigger proportionately compared to a human, from head to tail-tip she is just over 20'), she is also able to swallow her opponents fairly easily, provided she gets the drop on them or incapacitates them. She does prefer live prey, but if they give her too much trouble (or if she feels merciful), she has no qualms about issuing a quick death beforehand. She can fit around four humans in her stomach, (if one is a bit vertically challenged) but with any more than one, she is slowed down by the extra weight. Normally, it takes her around two hours to fully absorb a human-sized meal, with about another hour or so per extra human. She needs to have a large meal at least every six weeks, or every four weeks to avoid hunger pangs.
Even though she is essentially half serpentine, Kate is warm blooded, but she is still fairly vulnerable to very cold temperatures, and will become sleepy at around 40 degrees. If it continued to get colder, she could actually fall asleep, and possibly die. Another possible vulnerability is her long, intricately braided hair. She refuses to cut it, and it could someday become a bit of a liability, should someone decide to grab it and use it to gain leverage against her.

In general. Kate is an efficient assassin, who can still handle herself in a fight should the plan for a quick kill/swallow fail.