(Only when separated from her boyfriend)
This Eris Fairie lived in the Monster World and had a boyfriend. However, on or before Valentine's Day, she crossed over to the Human World and became marooned there and separated from her boyfriend. Angered that she had been separated from her boyriend, she took her anger out on couples at Lakewood High, using her powers to break them up.
Felix eventually caught the Eris Fairie, and used Dimension Mites to send her back to the Monster Dimension, but not before she revealed that one of the girls in one of Felix's chemistry classes had a crush on him.