Millie

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

She is the exciteful powerhouse of the I.M.P gang who always fights alongside Moxxie.

Millie is a short imp with red skin and a rather petite, pear-shaped figure with a long devilish tail. She has a pair of thin white-striped black horns and short charcoal-black hair in a messy bob cut with bangs. Her eyes have yellow sclera and long, thick eyelashes protruding from them, with a small beauty mark under the right eye. Her front teeth have a gap as well.

She also has a black heart tattooed on her right shoulder, and makeup which consists of shimmering dark red eyeshadow, thick black mascara, and black lipstick on her lips. She also has two white spots on her upper right arm, one on her upper left leg, two on her tail, and one on the tip of her tail.

Although short because she is an imp, she possesses extremely big breasts and a fat ass and thighs that would be big even for humans or succubi.

Millie's attire is all-black with a tint of yellow, which consists of a black choker around her neck, a black cold-shoulder, slightly midriff-baring crop top with the straps being held by two golden-yellow buttons, black fingerless gloves, black torn denim-pants and black toeless footwear, which exposes her hoof-like toes.

Not much is known about Millie's childhood, except that she was raised in a large family in the Wrath Ring by Lin and Joe, alongside her sister Sallie May and three brothers.

Lin and Joe would bring Millie and her siblings to Loo Loo Land when they had the money, and the last time she went prior to the series was when she was still a tot.

Millie participated an unknown amount of times in the Harvest Moon Festival Pain Games, where she killed other contestants and wracked up a neighborhood head count.

In the previous Harvest Moon Festival Pain Games prior to the series, Millie caused nine of the fifteen funerals from the event and was subsequently banned from participating in future games.

At an unknown point, Millie briefly dated Chazwick Thurman.

At some point, Millie became an assassin for hire in the Wrath Ring.

Sometime before the start of the series, while between jobs, Millie poached a hit from Blitzo and Moxxie. Blitzo tracked her down in order to recruit her after seeing her potential, leading to a bar fight. Following this, Millie joined I.M.P, left the Wrath Ring and moved to Imp City, and eventually fell in love with and married Moxxie.

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

She cares very much about her husband and her family, and 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, as 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 her ambushing him.

Unlike Moxxie, Millie is slightly easier to convincing on having sex with someone who isn't Moxxie, and she doesn't think threesomes are cheating as long as Moxxie is included in them. Millie is more of a bottom than a top since she prefers to get penetrated rather than pegging someone, but she doesn't mind it, after all, she pegs Moxxie.

In "Unhappy Campers", it is revealed that she has some issues about how she sees herself, confessing how she sometimes does not feel appreciated enough and how she wants to be seen more than just a "killing machine", stating how it feels nice to feel important and hear the cheers and applause of people every once in a while rather than the occasional screams of agony from her victims. In "Ghostf**kers", she had once suffered from insecurity over how she feels like she's seen as a "Wrathian who's only good for their muscle" until she met Blitzo who changed her life for the better.

Unlike her husband, Millie seems to be not much bothered by Blitzo's constant attempts to become their "third", even if sometimes she wants to be alone with Moxxie. In "Ghostf**kers", it's revealed that, unlike most others, Millie doesn't see Blitzo as someone who messes with others' lives, as it was thanks to him that she got a better life than the one she had, including falling in love with Moxxie and marrying him. This leads Millie to be the only one to be able to snap Blitzo out of his depression after the latter's falling out with Stolas.

Beneath her tough and optimistic exterior she still has vulnerable moments that she only selectively displays to.

As shown in "Murder Family", Millie is completely unharmed by the effects of human world fires.

Millie is skilled at using melee weapons, such as a giant battle-axe, to eliminate targets. Like her husband, she's also adept at using firearms, and she can also create makeshift weapons on the fly.

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.

She is seen to be adept at swimming.

Millie has proficient skills in volleyball, allowing her to make a perfect strike despite fracturing a camper's skull.

Millie has some experience with playing the banjo considering that she was raised in Wrath Ring in a farmlands.

Talented in music, Millie can play the set of drums like a professional.

Millie is able to juggle five axes.

Like Moxxie, she has a habit of singing whenever she gets very excited.

Millie has driving skills that is essential for her work, and can even drive aggressively when needed.

In "Unhappy Campers", she was able to deduct that Counselor Jimmy was the culprit behind the murder of a client due to his shifty appearance and possession of money, drugs, and a drill. In "Mission: Antarctica", when she examined the marks on the seal's corpse, she identified them as non-bullet-inflicted scratches and bite marks, deducing that the seal wasn't running at her, Blitzo, and Moxxie, but was running away from whatever attacked it. She also possessed some knowledge regarding Blitzo's Asmodean Crystal, saying that because its from Lust it shouldn't be forced but "treated right" and caressed to work. In "Ghostf**kers," Blitzo commends Millie for her intellect in a flashback and she was able to figure out who the culprit was in the One Star Wonder hotel murders.

As shown in "The Harvest Moon Festival", she has knives on the side of her and Moxxie's shared bed.

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. However 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.

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 in a livestream on April 30, 2022, that in hell years Loona is 22, making Millie roughly 27 years old. However, it is not known if Hell years are the same length as Earth years.

In "Exes and Oohs" it was revealed on Moxxie's Sinstagram that Millie took his last name after they got married.

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. She also pegs Moxxie.

Millie is rarely seen without her choker, even in bed.

Millie is straight, A.K.A heterosexual.

Millie has a southern accent.

It is revealed in "Ghostf**kers" that Millie moved to the Pride Ring after joining I.M.P, and before meeting Blitzo, she used to be a free-lance assassin, who at one time stole a job from Moxxie, which led to Blitzo wanting to hire her.