Megara is beautiful, independent and quick-witted, but also cynical and world-weary, making her atypical among Disney's lead females, and plays enough of a heroic part in the movie to be classed as a heroine, rather than just a romantic interest. She has a very low opinion of men in general, since her experiences with them are mostly negative. While Hercules falls for her at first sight, far from falling for him on the spot, she dismisses him as putting on an 'innocent farm-boy routine', and it is not until they spend real quality time together that she begins to fall for him.
Megara is aware of her own sexuality, and is perfectly capable of using it to persuade men to do whatever she wants. But this is just another reason she has a low opinion of men, since it is a thing she is usually unwilling to do.
Meg is afraid of heights, but apparently overcomes her fear by the end of the movie.
In their first meeting in the episode Hercules and the Aetolian Amphora, Meg wants to forget all about her ex-boyfriend (later shown to be Prince Adonis) and shows very little remorse in using her sexuality to manipulate the young Hercules into helping her steal a jar of Lethe water. Her atire is almost identical in this episode, except that her skirt is much shorter. At the end of the episode her memory is wiped, explaining how she and Hercules met 'for the first time' in the movie.
One of the things Meg is notable for is her death in Hercules. While she is not shown as being visibly injured by the falling pillar, she is shown to be in considerable pain in multiple scenes. The moment of her actual death is seen (her thread is cut and her hand falls limp) and she can be clearly seen dead several times. Her spirit is also seen in a similar state in the River Styx.
In the film, Megara sold her soul to Hades in order to save her boyfriend's life, but shortly afterwards he had dumped her for some other 'babe', abandoning her. This leaves Megara feeling heartbroken and determined to never fall in love again. At first, Megara is simply used as a pawn in Hades' plot to defeat Hercules, and when Hades offers her freedom in return for Hercules' weakness, she willingly accepts the deal, but as she gets to know the demi-god she finds herself falling in love with him, though she is loath to admit it. She decides that she would rather serve Hades unwillingly, than betray Hercules.
Unfortunately, through this, Hades realizes that Meg is Hercules' weakness. He uses Meg to persuade Hercules to give up his strength for 24 hours, and then spitefully reveals that she was working for him all along. His heart broken, Hercules loses the will to fight the Cyclops Hades turns upon him. Meg finds and unties Pegasus and battles her fear of heights to find Phil, persuading him to come back and help Hercules regain his confidence.
After Hercules manages to defeat the Cyclops using his wits, Meg sees a pillar collapsing onto him, and in a moment of emotion, leaps to push him out of the way. Unfortunately, this means she is crushed by the pillar instead, sustaining huge internal injuries, but not having a visible scratch on her. This breaks Hades' contract, meaning he regains his strength. As he asks her why she did it, she finally admits she loves him. Touched by her love for him, Hercules promises Meg she will make it and leaves her in Phil's care while he goes to stop Hades taking over Olympus.
After saving Olympus, Hercules races back to be with Meg rather than chasing Hades, but arrives seconds after she has passed away from her injuries. He then travels to the Underworld, and rescues her soul, which brings her back to life (and makes him a True Hero). Meg and Hercules then travel to the gates of Olympus, where Meg watches Hercules ready to enter Olympus, where she, being mortal, cannot follow. However, Hercules realizes that he wants to be with Meg, and gives up his chance to be a god on Mount Olympus in order to live a mortal life on Earth with her.
Meg appears in two episodes of Hercules: The Animated Series. The first is Hercules and the Aetolian Amphora, in which she appears as a teenager. It culminates in her and Hercules's memories of their meeting being erased. The other episode is Hercules and the Yearbook, a clip show which shows she, now married to Hercules, finds his old yearbook and looks back on some of his school misadventures.
Role in the series
Meg reprises her role from the movie, though she is now classified as a soul slave to Hades. this is done to prevent the Lougers being mad at her and understanding her problem due to the fact the villain has a rep to corrupting and/or making those who are not villains their personal soul slaves.