Kitten

Kitten is Gunter's offspring, first seen in "The Chamber of Frozen Blades." It appears to be magical in some way, as when it hatches, it is glowing and floating, and it has a heart-like symbol on its forehead. It also has a tail that could be mistaken as a 5th leg. The kitten's father is unknown. Doctor Princess said that the birth was "horrifyingly beautiful." In "Princess Monster Wife," Gunter's Kitten makes a brief appearance as Ice King starts singing to his wife. It is also seen at the end of the song before Ice King reveals his sculpture.

Appearance
It is a kitten that is completely pink, except for a red heart on the forehead. It has large eyes, and unlike most characters, it's eyes aren't solid black. It has turquoise eyes with black pupils. It has pointed ears and a thin tail.

Trivia

 * The character is referred to as "Gunther's love child <3" in the character design documents.
 * In one version of the episode's storyboard, Gunter's offspring was going to be a hybrid Ice King/penguin creature. However, as Adam Muto explained, he originally drew a glowing kitten, but Thurop Van Orman (who was working on the show at the time) wanted it to be an Ice King/Penguin offspring, which they thought would be a "cool gross-out moment." However, the network vetoed that idea, and it went back to being a kitten.
 * According to Patrick McHale, the kitten appeared in "Princess Monster Wife" because Adam Muto liked the sound of McHale's cat Arthur singing along to the demo track for the Ice King's song, and added the kitten to the episode's storyboards.