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The Abbott family in general
- Action Survivor: Sans their four year old child and the father.
- A Boy, a Girl, and a Baby Family: After losing Beau, the family consists of Regan, Marcus, their parents and a baby that is soon to be born.
- The nature of their situation demands that the family be extremely cautious about everything they do, and when problems erupt they have a large number of contingencies in place. One in particular involves them creating an underground bunker with a crate and an oxygen mask for their newborn to muffle his cries. Lee and Evelyn end up having one of the few vocal conversations of the film in that bunker, amazed that it worked.
- It even goes as far as mealtimes (eating from place mats with their hands) and board games (using cloth playing pieces and rolling dice on the carpet).
- All the doors in the house are kept open at all times, no doors are opened or closed in the entire movie since the noise they make would attract attention and keeping them locked would provide absolutely no protection from the monsters' Absurdly Sharp Claws.
- The father (with possible help from his wife) is responsible for the massive lines of sand that the family walks on throughout the film, which connects their house to the nearby town and various other locations, and is even seen filling in a gap with fresh sand. This likely doubles with the Does Not Like Shoes entry below, solely to reduce the noise they make.
- Does Not Like Shoes: They are shown walking around everywhere barefoot and/or tiptoe, inside and outside, in order to make as little noise moving as possible.
- Elective Mute: They spend nearly the entire movie communicating only through sign language, not because they can't talk, but in order to prevent blind monsters from hunting them down.
- Good Parents: Both Lee and Evelyn love their children deeply and do the best they can in the worst of circumstances. Evelyn even asks what they are if they can't protect them.
- Guile Hero: The entire family is amazingly resourceful, taking near every precaution to operate without making any notable sounds. Lee in particular is portrayed as almost a Crazy Survivalist, going from meticulously lining their paths with sand to doing radio operations and electronics soldering.
- Happily Married: Evelyn and Lee clearly love one another deeply.
- Homeschooled Kids: Justified, as there wouldn't be a functional school. Evelyn is shown tutoring Marcus in math (a Shakespeare sonnet can also be seen written behind them).
- No Name Given: The family's names were revealed in supplementary materials, but don't appear in the film itself. The baby born and the old man (and wife) aren't named either, likewise, neither is the species of the aliens.
- Too Dumb to Live: Averted throughout the film, the family doesn't really make any of the standard stupid horror movie decisions and have actively planned and prepared for the monsters to attack. The only really unintelligent decisions in the film can mostly be Hand Waved as Beau playing with the rocket ship, which subsequently leads to his death can be dismissed as him being a young child that simply didn't know any better, and Evelyn's pregnancy is possibly implied to have been unplanned, with the family taking multiple precautions to make sure her labor doesn't alert the monsters.
Played By: Emily BluntThe Mother of the family
- Agony of the Feet: She steps on an exposed nail and cant stop a brief gasp of pain, further alerting the aliens to her presence.
- Mama Bear: She will fight to her last breath to protect her children. Her one goal in life is to make certain they're safe.
- Imperiled in Pregnancy: Because of the Agony of the Feet trope and that she had gone into labor
- Pregnant Badass: She is pregnant with their fourth child, and has to deal with the monsters in various ways. Her water breaks and she gives birth while the rest of the family is elsewhere, she has to not only fight through the contractions (mostly) without noise, she manages to give birth on her own.
Played By: John KrasinskiThe dad of the family, who tinkers with cochlear implants, looks after the family, and has been taking notes on the monsters
- Beard of Sorrow: Grows one after the death of their youngest.
- Decoy Protagonist: The film's marketing strongly emphasized him as the hero of the film, especially given the fact that he is played by the director. Around three quarters in, however, he takes a mortal wound from a monster and sacrifices himself to draw it away from his teenage daughter Regan; it is she who is the true hero of the story, and is the one who figures out how to defeat the monsters.
- Determinator: For two things. One was his desperate attempts at understanding the monsters and their weaknesses. The other was fixing Regan's hearing aid.
- Dying Declaration of Love: Towards Regan before his Heroic Sacrifice.Lee: *signing* "I love you. I have always loved you."
- Heroic Sacrifice: Lee yells out to get the monster's attention, giving his kids the chance they need to escape, but dies in the process.
- Papa Wolf: He will defend his family, no matter what.
- Sacrificial Lion: His death serves as one.
Played By: Millicent SimmondsThe oldest and only daughter of the Abbots, who's deaf.
- Abandon the Disabled: Throughout the film, after Beau was killed by the monsters, she thinks Lee will do this. Marcus tries to tell her otherwise.
- Big Ol' Eyebrows: Her eyebrows are a prominent facial feature.
- Big Sister Instinct: Has this towards Marcus and Beau. The latter case plays this for tragedy, as she feels responsible for Beau's death
- Disabled Means Helpless: Played with. While she is deaf, she's no more vulnerable than the other characters when it comes to dealing with the monsters besides that she won't hear them coming (as demonstrated in one scene).
- There's also the fact that Lee doesn't take her along with him on errands, even when she volunteers and Marcus would rather stay home. While she clearly thinks it's because her father blames her, it can be deduced that he's merely worried about her making a noise, or being near a noisy animal, and not being able to realize it.
- Girlish Pigtails: She's had these in the opening of the movie
- It's All My Fault: This is how she feels after Beaus death, as she gave him the space shuttle but didn't know he grabbed the batteries.
Played By: Noah JupeThe middle and older son
- Character Development: He is the most skittish of the family, and at several points, his father has to physically cover his mouth to keep him from screaming. In the climax of the film, he has learned to be more resilient, and keeps his cool.
- Ill Boy: Has (or had) an unspecified illness that leaves him weak much of the time. The first scene involves the family traveling into town to get medication for him.
Played By: Cade WoodwardThe youngest kid of the Abbots, who gets killed by the monsters when he switches on his toy rocket.
- Big Sister Worship: From what's implied, he's had this sort of relationship with Reagan and she's hit the hardest by his death.
- Children Are Innocent: Played for tragedy. His decision to switch on the toy rocket can only be excused by his age and lack of understanding towards the whole situation.
- Death of a Child: In the opening scene no less. The monsters don't discriminate
- Gory Discretion Shot: We don't see him die, as he gets snatched by the monster and dragged offscreen.
- Kid Has a Point: In a sense, if we remember his comment about going to space in the beginning and considering what we see of the monsters. Of course, him being so young, he probably didn't understand that his family can't do that.
- Sacrificial Lamb: His death early on established the threat the monsters pose and that they mercilessly hunt based on loud noises.
- We Hardly Knew Ye: We don't learn much about him except for his love of rockets.
Strange beings that lurk just out of the way
- Absurdly Sharp Claws: Their claws can rip through metal like paper, unless the Rule of Drama demands otherwise.
- Achilles' Heel: The creatures are quite vulnerable to high-pitched frequencies that appear to place them in so much agony, they become paralyzed with their armor stripped from their heads.
- Ax-Crazy: Paying attention to The Big Board in Lee's workshop reveals that the beasts don't eat their kills, making their rampages much more senseless. It's much more ambiguous than most examples, as we don't know why they do it.
- Berserk Button: Obviously, making particularly audible noises is this for the alien beasts, but it gets taken Up to Eleven when Regan accidentally discovers that they can be harmed by certain pitches and frequencies, and as a result, one of the beasts tears through the silos metal wall like it was tissue paper.
- Bizarre Alien Biology: They are humanoid creatures covered in armor. They have no eyes, but the armored plates on their heads can be moved by muscles to expose the soft skin beneath, including giant ear canals that they use to hunt with.
- Creepily Long Arms: They have spider-like limbs.
- Crippling Overspecialization: The monsters hunt exclusively by sound, not sight or even echolocation, and as such are easily fooled and even distracted by bigger sounds. A specific high-pitched frequency from Regan's cochlear implant is outright painful for them, and at the right intensity actually harms them.
- Eyeless Face: They have no eyes and solely rely on their exceptional hearing.
- Flower Mouth: They have a headplate that opens this way.
- Insectoid Aliens: The creatures' legs suggest this.
- Lightning Bruiser: They are strong enough to rip through a metal grain silo effortlessly, have extremely durable armour, and to top it all off, are so fast they can arrive on the scene in moments when something gets their attention.
- Logical Weakness: A monster with such powerful hearing is naturally weak to loud and high-frequency noises. And in spite of the armored body, once it's in pain enough to expose most of the head, it can killed by a shotgun blast.
- More Teeth than the Osmond Family: Their heads are mostly sharp teeth and a series of armored plates hiding massive ear canals.
- The Needless: Possibly tied with being Perpetual-Motion Monsters. They apparently don't eat what they kill, and considering their origins, they don't need to breathe either.
- Nigh-Invulnerability: What really makes the aliens the threat they are, more so than any other quality, is their armor plating. When fully locked down, they are completely indestructible.
- Sensory Overload: They can't stand high-frequency/pitched sounds.
- Super-Persistent Predator: The monsters are utterly relentless and when they hear a noise, they will not stop until they've killed something.
- Super Senses: The monsters have very sensitive hearing.
- Walking Techbane: They cause electronics to go on the fritz just by being near them. A recurring signal that they are around is the lights beginning to flicker. This, combined with the daughter's cochlear implant causes a sound feedback that is physically painful to the monsters.
The Old CoupleA couple that Lee and Marcus find
- Driven to Suicide: The Old Man after the death of his wife
- Flies Equals Evil: We get flies and find them near the Old Woman's corpse
- Gory Discretion Shot: Both of them, though we see the Old Woman's body but we don't too much
- No Name Given: We don't get their names and they don't seem to be named in the credits
- We Hardly Knew Ye: We only see one dead and the other one get killed off.