The gukuy are land-dwelling aliens from planet Ishtar with six short tentacles called pegs and six arms for manipulating objects. They have 4 sexes ; Mothers, sterile females, Truemales and sterile males. They have a mantle that changes color to reflect their emotions. The colors and corresponding emotions are as follows:

- Ochre: Uncertainty

- Orange: Astonishment

- Pink: Anxiety

- Red: Fear

- Gray: Indifference

- Blue: Anger

- Green: Tranquility and love

- Brown: Sadness

- White: Sexual arousal

- Black: Impacable

Truemales are the only ones capable of complex color displays.