Cassandra Cain (Earth-9991)

"I've been avoiding you. It's... your background. The assassin training and all that. It's just... I mean, Batman and I had some rough stuff to deal with growing, but... but you -- you were raised to be that guy there, and you turned yourself into one of us. That's... pretty intimidating."

- - Nightwing

Abilities
Stealth: Due to her excessive training she is also a master of stealth.
 * Peak Human Conditioning: Through continuous intense training Cassandra represents the greatest fighting weapon ever conceived. She possesses peak level strength, stamina, speed and agility comparable to the finest human athlete.
 * Martial Arts: Due to her life long training Cassandra has a master level knowledge of all fighting arts known and unknown and continues to learn with every new opponent she faces. She was trained by her father Deathstroke, along with several other members of the Hand of Shadows, including Bronze Tiger, Elektra and Ubu. Upon taking the mantle of Batgirl, she was trained further by Batman, Oracle, Songbird, and Lady Shiva. She has also invented her own styles and techniques.
 * The Falling Leaf Technique: The technique is a nerve pinch invented by Chinese monks in the 16th Century. Cassandra and her father are the only people who know how to use it.
 * Hand-to-Hand Combat: Cassandra is schooled in all known and many unknown assassin techniques such as pressure points, killing techniques and stealth to name a few.
 * Body Reading Ability: Cassandra has the advanced ability to read body language enabling her to read what people are thinking and tell what they are going to do next before they do it. She has been shown able to read opponents far faster than herself, along with non humans and even alien lifeforms once she is given a chance to learn their body language. This enables her to identify disguised and transformed people as well.
 * Investigation: She was also very briefly trained in detective methods by Nightwing during their time in the Bronx.

Weaknesses

 * Dyslexia: Cassandra has extreme dyslexia, making it very difficult for her to read.
 * Over-Reliance on Body Reading Ability: While a definite strength in combat, Cassandra's ability to read body language can work against her when she can't properly discern an the intent of the opponents actions based on body language. Generally this can be happen when an opponent is very good ad disguising their intent like Taskmaster, who can keep Cassandra distracted with subtle body language that could hint at many possible actions (Cassandra stated that when Taskmaster moves, his body "sings like a chorus. Too fast with too many voices to pick up accurately".)

Trivia

 * Source for abilities section: and Abilities