Katrina is an adult human woman who has short grey hair that is above shoulder length. She has thin black eyebrows, an angled jaw line, a prominent nose, and she wears grey eye-shadow and burgundy lipstick.
She wears a navy business suit that has a fur lined collar around the jacket collar and sleeves, grey undershirt, and oval beaded necklace, and teardrop earrings.
In the 1990s she had brown hair and was seen wearing a pink spaghetti-strapped sequined evening dress, white feather boa and a gold chain around her neck.
She is shown to be neurotic and possibly an alcoholic in a flashback in Hank After Dark. She is also mentioned to cheat, and shows a lack of interest in arguing with Mr. Peanutbutter.
In That Went Well, after Mr. Peanutbutter saves Pacific Ocean City from a spaghetti-related problem caused by Margo, Katrina shows up and offers Mr. Peanutbutter a job as the candidate for the Governor of California.
She is a supporting character of Season 4, advising Mr. Peanutbutter on how to run for the position of governor in See Mr. Peanutbutter Run.
In Underground at Mr. Peanutbutter's posh campaign fundraiser, she keeps calmly acting as his campaign manager in spite it took a terrifying turn.
It turns out he is not a very good choice for an electoral candidate.
He eventually dropped out, and she began advising Jessica Biel, Mr. Peanutbutter's second ex-wife. They both lost the election to Woodchuck Coodchuck-Berkowitz after Biel has a public meltdown over having avocado on her plate despite requesting not to have them, and Diane decides to make it her new blog post in GirlCroosh.
She is also on good terms with Mr. Peanutbutter's friend Erica and is the second person on the show to acknowledge she exists, the first being Mr. Peanutbutter.
- In The Judge Diane calls her "Cruella."
- In Lovin that cali lifestyle!! she manages her IT-guy by calling him Computer.
Katrina: This election is about bigger things than just you and Woodchuck.
Mr.Peanutbutter: What is it about then?
Katrina: It's about hope and freedom, and powerful lobbyists who pay me to elect a governor I can control so we can get legislation passed that allows them to build private prisons on what are now protected wetlands.