Eris is the Goddess of Discord and Chaos. Eris used to receive a large allowance from her Father ("Daddy") every month up until The Firebird Sweet, when Eris had to get a job after being cut off by her Father for all the trouble she'd been causing.
She is portrayed as a curvaceous and beautiful, but seductive, vindictive, and blonde-haired woman with a gap in her teeth (However, in her debut episode, her teeth were perfectly normal). Her style is somewhat Greek related. A divine sadist, Eris likes to cause all kinds of chaos and destruction. Eris is the keeper of the Apple of Discord, a golden apple that can transform into any shape to assist her into wreaking havoc. Billy refers to it as "The Magic Banana" (even though he identified it correctly in Causing Chaos) due to its yellow color. Her accent and behavior are prone to sudden shifts, from a stereotypical valley girl (which was shown in "To Eris Human" and described as a phase by Grim, who once had a crush on Eris) to a refined British woman.
She briefly dated Hoss, whom she said brought order to her chaotic life. However as the divine personification of chaos, bringing order to her caused their to be an excess of it throughout the universe, finding that this was why he hadn't found a monster to fight in weeks he decided to break up with Eris.
Some chaos that Eris has caused was giving kids brain-washing teddy bears, selling cereal with an Underworld species of Phoenix inside every box, turning Mandy into a fighting monster, giving away golden apples so that they would do her bidding of chaos, and destroying Billy's house with giant alien zombie lobsters.