Ice Queen

The Ice Queen is the fictional gender-swapped version of the Ice King, created by the original series designer, Natasha Allegri. She has winter/ice-related powers like Ice King, which originates from her tiara. She makes her first and, so far, only appearance in the episode "Fionna and Cake," in which it is revealed that she, like all the other gender-swapped characters, exists only in fanfiction written by the Ice King.

Appearance
The Ice Queen has light blue skin, long white hair, and long lightning-shaped eyebrows. Her hair, while also long like the Ice King's beard, is wavy with curls instead of shaggy. She wears a small golden tiara with red gems and a neck band encrusted with a single blue gem in the center. She also wears a blue long sleeved ball gown, and light and dark blue shoes.

Personality
Interestingly, despite being a creation of the Ice King's imagination, the Ice Queen is far more cruel, evil, and aggressive than he is. She uses much more violent and complex means to get her way than the Ice King does, such as tormenting Fionna with a wild scheme in order to put her out of commission, and leaving her free to obtain Prince Gumball, while the Ice King would usually break in through a window with a cheesy phrase. She is more serious than the Ice King, but like her counterpart, she inevitably fails.

Origin
Natasha Allegri has confirmed that the Ice Queen has a different origin than the Ice King (meaning that she found her crown a different way), but she was presumably a normal human being just like Simon Petrikov. It's unknown if she made friends with Marshall Lee, like Simon Petricove being friends with Marceline during the great Mushroom War.

Trivia

 * The Ice Queen's final designs differ from that of her initial designs, and this is because Natasha wanted her dress to resemble the dresses worn by Anastasia and Drizella, the mean step sisters from the Disney film Cinderella.
 * Just as the Ice King's source of power is his crown, Ice Queen's is her tiara, which even Cake uses for an ice attack at one point.
 * The Ice Queen's eyebrows are the equivalent of the Ice King's beard, allowing flight.
 * The Ice Queen's eyebrows were inspired by the Night Elves from World of Warcraft.
 * The Ice Queen refers to Fionna as a "tomboy."
 * In Natasha's drawing, Ice Queen was the previous owner of Cake, who cared for her as a kitten.
 * Fionna warns Cake about Ice Queen's tiara, saying that Cake "might catch her crazy." This infers that it would make her evil. It also mirrors Ice King's origin story in "Holly Jolly Secrets Part II" showing that he somewhat knows of these origins.
 * It is possible that Ice Queen's more evil personality and cunning is based on what Ice King believes himself to be like. He might have made her like this to make him sound more tough, as it is he that wrote this story.
 * According to Natasha, the Ice Queen's backstory is completely different from that of the Ice King, meaning she acquired her tiara in a different way, to that of the king's crown.
 * She, unlike Ice King, can do a perfect imitation of Prince Gumball, while Ice King's imitation of Princess Bubblegum is horrible.
 * While the Ice King is always barefoot, the Ice Queen wears shoes.
 * There is a "Pet Society" costume of her.

Quotes
See Ice Queen/Quotes.