Ice Queen

Interestingly, despite alternate version of the Ice King, 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. In the Fionna and Cake comics, she is revealed to be a quite tragic character as her schemes are all aimed at fixing her condition caused by her Tiara. That being said, the episode, "Five Short Tables", shows she does have a comical side similar to Ice King, as she also writes fanfic and almost wanted Cake to make her a flapjack portrait.

As a human, she appears to be more mild-mannered and enjoys her profession serving ice cream. Like everyone else in her world whose memories of their past lives were erased, she has completely forgotten about her feud with Fionna. Though she showed indignation at seeing Fionna climb into her cart.

You went to her kingdom by mere chance, let's see how you can get her off your back.

"The prince shall be mine!" “Outta my way, tomboy!” “You should talk! Keeping all the babes to yourself, totally ice-blocking my game!” “NOT THIS TIME!!!” “This was so much easier than I thought it would be!” “You're what stands between me and my Gumball!” “You like my ice sword?” “Paws off my prince!” “My magic tiara...my powers!”