As a human, Miss Skullnick is a heavyset middle-aged woman with cream-colored skin, faded red hair that is styled back to resemble horns or flames, and black eyes. She wears small black-rimmed reading glasses, gold hoop earrings, a lavender shirt, leopard-print pants, and purple high-heels.
As a troll, Miss Skullnick is slightly fatter than before with the addition of some body hair. She now has pale green skin, longer hair in a brighter shade of red, yellow eyes, turquoise lips, an underbite with protruding fangs, longer ears and nose, and a pink gemstone embedded in her navel. In season one, she retains her original wardrobe as a human, but her shirt has ripped sleeves. In season two, her leopard-print pants are replaced by gray pants.
She appears to have a short temper and does not take her job very seriously; in her first appearance, she paints her toenails during class, leaving her students to do nothing. After being transformed into a troll and falling out of love, she only seemed to have become even grumpier and more sarcastic. Miss Skullnick openly admits to having a dim view of fun, believing that a lack of rules and order leads to anarchy.
She dislikes being a troll at first, but ultimately becomes indifferent to the transformation. However, upon learning that trolls have various physical perks over humans, she began to cheer up a little, and seemed to show care for her students when they were in danger.
Miss Skullnick briefly appears in "Star Comes to Earth" when Marco is called to Principal Skeeves' office. She quickly grows annoyed with Marco's boasting about being "in trouble", telling him to "just go already".
In "Match Maker", Star, attempting to fix Skullnick's flailing love life, accidentally turns her into a troll. With no way to turn back into a human, she then remains this way from the rest of the episode onwards. She briefly falls in love with Emmitt (a member of Ludo's army) during this time, but because she couldn't understand a word he was saying, she assumes that she was dumped.
In "Interdimensional Field Trip", Miss Skullnick leads the class on a field trip to a paper clip museum, only for the class to complain about the boring trip and Star to take over, bringing everyone into another dimension. Left to her own devices, Miss Skullnick learns to accept being turned into a troll, given the species' superior longevity and strength over humans. Miss Skullnick eventually has to rescue the class from a yarn monster they accidentally released, using her newly discovered abilities to do it.
In "Girls' Day Out", Miss Skullnick sends Star to detention when she lets out the class hamster, Marisol, and tasks Marco with finding the hamster.
In "Bon Bon the Birthday Clown", Marco spins her around as he happily exits the school gymnasium, causing her to fall over. Later, she serves as a strict chaperone at the school dance, keeping the boys and girls from being too close during dances.
in "Mathmagic", she tries to get Star to solve a math problem. Star refuses, causing a series of time paradoxes, including one where Miss Skullnick is in her human form once more. Star ultimately attempts the problem, but fails to solve it. However, Miss Skullnick commends her for trying.
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- In "School Spirit", Miss Skullnick states her favorite weapon is the battle axe, and she wields one in "Interdimensional Field Trip".
- Miss Skullnick has been shown to have a substantial appetite following her transformation. In "School Spirit", she strips the meat off of entire roasted chickens, and in "Mewnipendance Day", she answers Star's invitation to attend the reenactment solely for the promise of meat.
- In "Girls' Day Out", Miss Skullnick reveals her first name as Margaret.