Here is one of the newest companions characters, soon to be re-drawn in pixel form.

Her name is Trell and she takes being a Ninja very seriously. Trell uses dual Kamas and throwing daggers against her enemies to great effect!

She is lightly armored but most people will have a hard time ever striking her due to her high agility and speed.  One of her perks is "Stealth Movement" which grants the player a permanent bonus to their own skill. This also means you are less likely to get ambushed and have an increased chance of ambushing enemies due to her increased awareness.