Mirage is the 3rd, and current, leader of the Villain League. Mirage is the adopted daughter of Malefor because Malefor needed someone to keep up his lineage and that he needed someone who was very evil in order to be adopted and become his son or daughter. Despite the rest of the villain league thinking that someone as evil as Mirage would try to overthow the Dark Spawn Lord leader, in reality, she's actually very obedient to Malefor, as she has been known to keep the mortal or non-dark spawn villains in line so they can focus on their countless plans for conquest. Mirage is also a deadly adversary to Aladdin, and is the current Big Bad of Agrabah with the demise of Jafar and Sa'Luk.
"I do love a tragic ending." - Mirage
Mirage was once a "normal" enchantress, involved in a romantic relationship with the cyclops mage Phasir. After some time, she parted ways with him and became evil, rising in rank until she became the new Evil Incarnate. Why she turned to the Dark Side, and wether her feline features are in her nature or due to the influence of Evil is not known. What is sure is that since her downfall, Phasir keeps standing in her way, trying his best to keep her evil influence at bay, and patiently waiting for the moment when love will bring her back to his side. He attempted several times to convince her to renounce to her evil ways, but not to avail.
Being the Evil Incarnate, Mirage has no defined goal and she acts out of sheer malice. She reigns over the demonic world of Morbia: an endless void of everlasting night, filled with floating rocks, where her Sphinx-like temple is located. She keeps an eye on the world through several crystal balls and choose a place at random where she causes strife, plagues or other disasters; before passing to the next one. She controls many types of monsters, if not every kind of demonic being in the world, and sends them to attack a town or a village on a regular basis. She also often attempts to increase the number of her minions; looking for people with a "seed of Evil" within them, tempting them with a promise of power and tricking them to become monsters under her command. Many of Mirage's Monsters (and even Mirage herself to some extend) feed and gain strenght on the fear they cause to their victims. Because of this, they become weaker against someone who isn't afraid of them.
Personality-wise, Mirage is unsurprisingly cruel, sadistic and sarcastic. She enjoys causing destruction and disarray, but she enjoys even more causing despair and breaking hopes. She considers breaking her victim's spirit to be much more important than mere destruction; and as such, she intensely dislikes everything that can inspire people's faith, and she despises love and any other positive feeling. She hates Aladdin and cannot stand Genie, yet she displays a loathing respect towards them and acknowledges their merit. (mostly Aladdin's) She would stop at nothing to defeat Aladdin but not necesarily to kill him, as she would be satisfied to let him alive, either as her slave, or simply hopeless in front of the ruins of his beloved Agrabah.
Mirage is also highly intelligent and manipulative. She knows very well how to use people's doubts and dislikes to her advantage. She is more of the scheming type and rarely (if not never) directly involves herself more than she absolutely must. She prefers give her instructions or set her plans and then watch the action in her temple of Morbia.
"I have eternity to teach you fear. And even if it takes that long, you will learn fear, Aladdin!" - Mirage
Mirage is extremely powerful, being on an equal footing with Jafar, (as a sorcerer) Genie and Mozenrath. She wields many common powers such as flying, teleporting, travelling through dimensions, shapeshifting, making images or avatar of herself appear out of nowhere, and seeing or talking where she isn't physically present. She controls illusions to the point of being able to create illusionary places which she can manipulate; and she can warp reality to the point of creating fake replikas of an entire city. She controls shadows as well, as she is able to generate objects whose shadow destroys everything it comes in contact with, and rules the Shadow Realm, where the evil El Katib are dwelling. She also has the ability to summon nightmares in sleeping minds.
She controls several monsters such as fire cats and the El Katib, and she exert an influence over everything evil. She knows every monster and demonic being, as well as every evil magical artifact that exists in the world, she knows where to find them and she can control everything they make happen. She can also use "traditional" sorcery such as spells and potions.
Mirage is never seen actually fighting but she masters several magical attacks: a claw swipe which sends slicing waves of green energy (her most used attack) / green energy rays fired in rapid succession / green bolts of lightning / she surrounds herself with green and black lightning. She also displays great physical strenght, being able to send Genie flying with a mere backhand.