What four traits are depicted as unfavorable within Dahl's depictions of Violet, Veruca, Augustus, and Mike?

Violet represents the unfavorable trait of not recognizing that there can be too much of a good thing. She chews gum all day long, to the exclusion of all other activities. Veruca represents the unfavorable nature of a spoiled child. Augustus's character acts as a warning against gluttony, and Dahl uses Mike's character to suggest that too much screen time can do a child harm.