Although Ali has it all, she is easily threatened by people who intimidate her. Her jealousy and need for power often get the best of her and cause her to act cruel and selfish; likewise her fearless nature has helped her to get revenge on her enemies numerous times. Ali is vindictive and cunning, she often uses other people as tools in her manipulations - she is the snake behind an angel's face.
Nobody tells a lie better than Alison DiLaurents. She has kept lots of information about her life from her friends, while managing to acquire all of their secrets. Ali often holds private knowledge of her friends over them to stay in control. She spun a web of lies so tangled that her friends were left to deal with the resentful "A" even after she was gone.
Ali displays sociopathic qualities: controlling, paranoid, charming, seductive, dominant, incapable of remorse, and extremely intelligent. Though at times, Ali does seem to display real emotion.