Dilbert's colleague and fellow engineer is a thoroughly cynical employee who has no sense of company loyalty and feels no need to mask his poor performance or his total lack of respect.
Alice is the only female engineer in Dilbert's department. She's habitually overworked. Her cardiovascular system is basically coffee. She has a quick temper when confronted with the idiocy of her co-workers. She does not handle criticism well.
Asok, pronounced ah-shook, was introduced to satisfy the hordes of interns who wrote to request their own character. Asok is brilliant, but as an intern he is immensely naive about the cruelties and politics of the business world. His name is a common one in India (but usually spelled Ashok).
Catbert is a typical cat, in the sense that he looks cute but he doesn't care if you live or die. As Human Resources Director at Dilbert's company, he teases employees before downsizing them.
Ratbert is a simpleminded optimist. He wants nothing more than to be loved, but he's doomed to ratdom which, despite his cheerfulness, makes him an unlikely candidate for affection. His resiliency enables him to continually be the butt of everyone's jokes.