Trudy is the beautiful, intelligent, and kind veterinarian mother of Penny, BeBe and CeCe. She comes from a relatively wealthy and very brainy family, with her father, Vincent Parker also being a doctor, and her sister, Diana being a famous actress. She married Oscar after he won the 1977 Spelling Bee Championship, because she felt that he was worth it. She was also a debutante like her daughter, Penny.
Trudy is often caring of her children as well. Since Trudy makes more money than Oscar, she asserts dominance over him at times, and often goes into a rage when he does not do what she wants. Although she always catches Oscar with other women, she never seems to even consider divorcing him. She does have a mean spirited side, as she openly talks and jokes about cheating on Oscar, and flirts with other men in front of him without caring at all. However, she would never even think of doing it. Also, when she is diagnosing Mariah Carey's monkey, she hides the fact that her last name is Proud (calling herself "Dr. Trudy"), since the monkey got sick from eating Proud Snax.
Trudy gives good advice, and is often the voice of reason for Penny and Oscar. However, she does not appreciate Oscar acting like a jerk or Penny misbehaving. She can also be a bit possessive of her kids when she and Oscar argue and usually refers to the kids as "hers" and sometimes threatens Oscar when he corrects her.
Her best friend is Sunset Boulevardez, because they share a few things in common: they are both strict mothers and housewives with teenage daughters, they do not like it when their husbands act dumb and idiotic, and they do not like their husbands flirting with other women, even though they do the same thing with attractive men.
Trudy's one of only five characters to have appeared in every single episode of the series, the other four are:
Oscar, Trudy's husband.
Penny, Trudy and Oscar's daughter.
Suga Mama, Oscar's mother and Trudy's mother-in-law.