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At last, after all this time, somepony powerful enough for me to embody has found me. And a princess no less. How delightfully fortunate. I will need every piece of my magic so I can get back to… him. Are you ready, Discord, my dear? Bit by bit, I'm coming home.
~ Cosmos possessing Twilight Sparkle.
You want to know what I am? I'm Malice Personified! Of course I used you! What goes better with malice than chaos! And if you won't join me as my companion, you can sit at my feet as my dog.
~ Cosmos revealing her true nature to Discord.
Cosmos is a major antagonist in IDW's My Little Pony: Friendship is Magic comic series, serving as the main antagonist of the story arc of the same name. She is a cosmic being and former lover of Discord who is bent on regaining all of her lost power and taking over Equestria for herself. While initially thought to be a chaotic being similar to Discord throughout the arc, it is revealed towards the end that she is actually the personification of malice instead.
At some point prior to the events of the series, Cosmos landed in Discord's home dimension of Chaosville, and the two quickly struck up a friendship and subsequent romance based on a shared love of chaos. Discord would later introduce Cosmos to the land of Equestria, where they would both cause havoc together. However, upon learning of Princess Celestia and Princess Luna, Cosmos, determined to make Equestria hers, resolved to dispose of them in order to do so, thus forcing Discord to distract the Princesses with a trail of illusions in order to keep them away from her.
Sometime afterwards, Cosmos, while in Caterlot with Discord, would attempt to transform one of Celestia's schools into a towering inferno, endangering all the ponies inside. After saving them, Discord attempted to Confront Cosmos over her actions, only to suffer her wrath and be transformed into a dog for dropping her new scarf. Finally driven too far by these events, Discord, escaping from Cosmos, allowed himself to be apprehended by King Aspen and the King of Abyssinia and brought before Celestia, Luna and Queen Novo, who accused him of creating the chaos around them. Discord denies doing so before being found by Cosmos, begging the others to banish her and even offering to help them do so.
Cosmos is then banished to the stars (with Discord ignoring her pleas to save her); although, before Celestia and the others can find out anything about what just happend, Discord puts them to sleep and wipes their memories of Cosmos, taking the fall for her actions as a result. Cosmos is now trapped in the form of a constellation known as the Andalusian, so he would wait for Discord to come free her until eventually having her stars knocked out of the sky and down to Equestria, with Discord burying one of the stars himself in the Everfree Forest in order to ensure that she would never return.
Don't get me wrong. Her sense of chaos was like nothing I'd ever imagined. It was all so much fun when it began...but her idea of chaos was dangerous. That's not chaos...it's madness. Cosmos wanted more than chocolate rain. She wanted fire and destruction. I never wanted to cause harm...even some villains have their moral standards.
~ Discord speaking about Cosmos.
As the personification of malice, Cosmos is ruthless, sadistic and cruel towards everything and everyone around her, and takes great enjoyment in her work. Being a creature similar in nature to Discord, she possesses nearly unlimited magic and uses it to change the world around her to her liking; although, unlike Discord (who uses his magic for relatively harmless mischief) she is deliberately malicious in how she uses her's, and her changes normally appears as being more destructive and violent in nature as well. Also opposed to Discord, she has no problem with hurting or even killing ponies and anything else that stands in her way, flying into a homicidal rage and wanting to dispose of Celestia and Luna upon learning of their rule over Equestria and later nearly destroying one of Celestia's schools and everyone inside it for her own amusement.
She can be incredibly cold and calculating in the pursuit of achieving her goals, being able to manipulate Discord and Twilight Sparkle's friends into helping her plans along, while gradually eliminating any obstacles that could stand in her way at the same time; notably imprisoning Applejack to keep her from interfering with her and preventing Discord from warning anyone of her return by forcing him to take care of Fluttershy instead. In spite of this, she is incredibly quick to anger, losing her cool more than once when possessing Twilight Sparkle and raging constantly at Discord for disobeying her whims during their relationship.
While she initially appears to have feelings for Discord, in the end it is shown that she never actually cared for him and merely wanted to mix his chaos with her own malice. Even when pretending to like him, Cosmos still showed little to no empathy for Discord, being unhealthily obsessive and incredibly controlling in their relationship and even quite abusive, to the point where she was willing to use her magic to transform him into a any form that suited her, such as a dog. She has an incredible desire for power in general, wanting to rule over Equestria by herself and make everyone living in it live in fear of her. While possessing others with the Andalusian stars, she appears the take on certain traits of their's, such as Zecora's rhyming talk or Big McIntosh's soft-spoken nature.
Cosmos' existence in the comics retcons Discord's original backstory, as the entire reason he was perceived as a threat rather than a nuisance and imprisoned was because of him taking the blame for her actions.
It is also claimed by Discord that she was responsible for the Everfree forest being the way it is as well, stating to Fluttershy that it was a herb garden before her magic changed it. However, as the Everfree forest is not shown to be affected when all of her magic is destroyed, this may have been an exaggeration on his part.
Cosmos is the second My Little Pony villain to be Pure Evil, the first being Tirac.
She's also the only villain in My Little Pony: Friendship is Magic to be considered Pure Evil, since other villains have either comedic traits or sympathetic motives.