Not them but it's pretty easy to say what makes the style "ugly":
- textured sawtooth lines (particularly around the eyes, eyebrows, and face)
- dirty textures (not present on the characters but present in nearly all the backgrounds)
- very big mouths on some of the characters (Zee, Kara)
- snub noses on some of the characters (Karen, Kara)
- irregular head shapes (Babs with her peanut head in particular)
These are all stereotypically ugly traits in art.