Millie

"Guilty and innocent aren't our business, Mox. Killing who we're paid to is our business."

- Millie, to Moxxie

Mildred "Millie" Knolastname is an assassin at I.M.P, Moxxie's wife and one of the main protagonists of Helluva Boss.

Appearance
Millie is a short Imp with a long devilish tail. She has red skin with white markings on her forearms and tail, eyes with yellow scleras and black pupils, darker red eyeshadow, black lipstick on her lips, and long black eyelashes that extend beyond the sides of her hair.

Similar to her mother, she has two black horns with three thin white stripes and dark gray hair worn in a messy bob style with bangs that cover half of her right horn. She has a beauty mark on her left cheek and a gap between her front teeth. Millie also has a black tattoo in the shape of a heart on her left shoulder.

Millie's head is noticeably more human-like (although still without a nose) than a lot of other imps, having rounder proportions with front teeth usually appearing flatter than the sharp conical teeth most demons have.

Her usual attire consists of a cold-shoulder black crop top with gold buttons where the straps at the top meet the torso piece, black fingerless gloves, a black choker around her neck, torn black pants, and black toeless footwear that exposes her hoof-like toes. During the episode Loo Loo Land, she wears sunglasses and a black suit and tie with a white shirt while guarding Stolas, just like Blitzo and Moxxie.

In the pilot, her skin was paler, and her hair had a white patch near her left horn, although it was removed by the proper series.

Personality
Millie is a very lively and cheerful individual. Often with a smile on her face and rarely standing still, she is a clear extrovert and is not afraid to speak her mind. This is regardless to whether it's expressing her excitement or flipping off a co-worker.

As the bruiser for I.M.P, she is shown to enjoy her job. Her meek exterior appearance belies a tough and very violent skillset. This is highlighted during a conversation Millie once had with her mother and sister. According to Moxxie, she is aggressive in "the sack" as well as her job.

In "Murder Family", she appeared to be very unsympathetic about killing a possibly innocent target, only caring if it was what their client wants, showcasing her dedication to her work, and her ruthlessness.

Despite this, she cares very much about her husband and her family. She and Moxxie absolutely adore each other, acting very affectionate and protective of one another.

She has a childlike fondness of Loo Loo Land, triggered by familial memories of going there as a child, and gets easily excited by all the merchandise.

Millie will become vicious and violent whenever someone harms Moxxie, to the point of going feral. Her violent streaks can often result in her getting carried away to the point of mindlessly attacking a perceived target, allowing her rage to override common sense, this is evidenced by her mother’s scolding her for allowing herself to be overcome with rage when she fought Striker. These rage states may leave Millie vulnerable to a more skilled opponent, as showcased by Striker incapacitating Millie in spite of him being ambushed by Millie.

Furthermore, she is also shown to be somewhat defensive of her work, expressing annoyance whenever anyone implies that freelance work doesn't pay well.

Natural Abilities

 * Fire resistance - In "Murder Family", Millie was unharmed by the fire while on Earth, although the full extent of this ability is not clear.

Skillset

 * Weapon proficiency - Millie is skilled at using a melee weapons, such as a giant battleaxe, to eliminate targets. Like her husband, she's also adept at using firearms, and she can also create makeshift weapons on the fly, such as when she made a Molotov cocktail to throw at the Catfish Monster.
 * Closed combat - Millie is highly adept at close combat in terms of raw strength, she is able to dismember armed human and eldritch opponents in hand-to-hand combat, being strong enough to force the jaws of a building sized monster open, or crush a human's skull with her thighs. Her actual close combat tactical skills are questionable, as she has been defeated by skilled or advantageously positioned opponents in melee combat on several occasions.
 * Swimming proficiency - She is seen to be adept at swimming as shown in "Spring Broken".

Gallery

 * Millie/Gallery

Trivia

 * As shown in "The Harvest Moon Festival", she has knives on the side of her and Moxxie's shared bed.
 * Viv has stated that she would change Millie's voice actor once the actual series premieres but would still keep her previous voice actor, Erica Lindbeck, to voice Loona. Later, actress and dancer, Vivian Nixon, was hired to voice Millie.
 * In Vivziepop's 2019 short Holidaze as an ornament on a Christmas Tree, there is a tree carved with initials "M+M →B←" in a heart that alludes to her, Moxxie, and Blitzo.
 * While Millie seems to tolerate Blitzo's intrusions, she is not shown to be comfortable with other men flirting with her, as the game attendant pushing Moxxie away and attempting to flirt with her noticeably upsets her.
 * Though, in "The Harvest Moon Festival", she didn't seem to mind and was actually flattered by Striker's attempt to flirt with her.
 * In "The Harvest Moon Festival", it is revealed that she is no longer allowed to participate in the Pain Games because she was responsible for nine out of the fifteen funerals that occurred at the time.
 * It is also revealed that one of her brothers got married at one point, and that she got severely injured while competing over who would catch the bouquet, but in the end Millie managed to do so.
 * In "Truth Seekers", she claims she is about five years older than Loona. If this is true, this places her and possibly Moxxie's age somewhere in her mid or late 20s, as Loona isn’t any younger than eighteen.
 * It was stated on April 30th, 2022 during a livestream, that, in hell years, Loona is 22, making Millie roughly 27 years old. It has not been confirmed, however, if Hell years are similar in length to Earth years, which makes their Earth age unknown.
 * It is revealed in "Ozzie's" that she and Moxxie have been married for a year. With the premiere date of the episode being approximately a year apart from the series' first episode, "Murder Family".
 * "The Circus" is the first and only episode so far wherein she and Moxxie are absent.
 * It is revealed through Blitzo's text history with her in "Seeing Stars" that Millie sends Blitzo pictures of the sex toys she plans on using on Moxxie, asking Blitzo on what he thinks of them.