Last updated: July 8, 2026·🔄 Product links checked and unavailable products replaced with current alternatives for 2026.· By Serdar

Halloween Costume Guide

Octavia Blake From The 100 Halloween Costume Guide

She hid under the floor for sixteen years. Now she runs the bunker.

Marie Avgeropoulos Braided Hair Green Eyes Leather
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Quick Answer: The Octavia Blake costume is a leather and armor Grounder warrior build anchored by a black wig and a hand drawn war paint line.
  • Black Braids Wig (essential)
  • Black Steampunk Gothic Corset (essential)
  • Japanese Katana (essential)
  • Brown Chest Armor
  • Black Amelia Victorian Boot

Octavia goes from a girl hidden under the Ark’s floor to a warrior who fights her way into leading an entire underground bunker of survivors. The vertical black line of war paint down her face is the one item that makes this costume read as Octavia instead of a generic Grounder warrior. The 100 aired on The CW from 2014 to 2020 (Wikipedia), so at a general Halloween party in 2026 you’ll likely get more “cool warrior” than “oh, Octavia,” though the face paint gives the look enough punch to work on its own.

Items Total15 Items
DifficultyMedium-Hard
VibePost-Apocalyptic Grounder Warrior
Cost$90–$220

Octavia Blake Halloween Costume Items

Octavia Blake from The 100 Halloween costume infographic showing black braided wig, steampunk corset, brown chest armor, katana, and leather leggings laid out

Octavia Blake Costume Items

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Octavia Blake The 100 Grounder Warrior
  • 1 Black Braids Wig (essential)Octavia’s hair is dark, thick, and pulled into small braids on the sides while the rest hangs loose. Get a wig with texture and built-in side braids, not a flat costume wig. Without the braids the silhouette reads as generic warrior instead of her specific look.
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  • 2 Black Steampunk Gothic Corset (essential)This is the main body piece and it needs to fit close without cutting off your breathing for six hours. Look for visible boning and a front lace or hook closure rather than a stretchy costume-store version. Too loose, and it just looks like a vest.
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  • 3 Fingerless Ripped Black GlovesAdds texture to the hands without covering them completely, which matters if you’re holding a drink or a prop sword most of the night.
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  • 4 Japanese Katana (essential)The prop weapon carries a lot of the visual weight here, second only to the face paint. Pick one that comes with a scabbard so you’re not carrying a bare blade through a crowded room. A flimsy prop bends and looks like a toy the moment someone bumps into you.
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  • 5 Brown Sword Frog HolderHolds the katana at your hip so you aren’t carrying it in your hand the whole party. Get the size right or the sword slides around when you walk.
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  • 6 Brown Chest ArmorSits over the corset and adds bulk to the chest and shoulders, which is where Octavia’s armor actually sits on the show.
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  • 7 Black Arm Leg GuardStraps on over a sleeve or bare arm. Check your closet for anything similar first.
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  • 8 Black Sword Back StrapAn alternative to the hip holder if you’d rather carry the katana across your back. Pick one or the other, not both.
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  • 9 Leather Legging Corset Belt Shawl Shoulder ScarfA cross-body strap detail that adds the layered, scavenged look Grounders have. It’s decorative, not structural, so don’t overthink the fit.
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  • 10 Black Leather Tight Rider LeggingThe base layer for your legs. Pair it with boots so the transition at the ankle doesn’t look unfinished.
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  • 11 Black Leather Leg Harness GarterA strap accessory for the thigh. Skip it if the rest of the outfit already looks busy.
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  • 12 Black Leg Ring HarnessSimilar function to the harness above. You don’t need both; pick whichever sits better on your build.
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  • 13 Brown Hood Woolen Cape CoatUseful if the venue is cold, and it adds the scavenged-survivor layering the character wears in colder episodes. It gets in the way if you’re dancing.
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  • 14 Leather Shoulder Black ArmorA second armor piece for the opposite shoulder from the chest piece, for symmetry or contrast depending on how you layer it.
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  • 15 Black Amelia Victorian BootPractical footwear that also fits the look. Any black lace-up boot you already own works fine here.
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Octavia Blake from The 100 in close-up with vertical black war paint down her forehead and nose, dirt and blood smudges on her face, and rugged warrior attire

How to Style the Octavia Blake Halloween Costume

The face paint is the first thing people notice, before the corset or the katana. A single straight line drawn slightly off-center or smeared halfway through the night turns the whole look into random tribal makeup instead of Octavia specifically. Skip the paint entirely and you’re just a person in a leather corset holding a sword, which reads as generic fantasy at best. Get the line right and set with powder, and everything else on the list is just support.

There’s a moment where Octavia fights her way through an entire arena of opponents to win the Conclave and take over leadership of Wonkru, and she does it without saying much of anything. That’s the energy to bring to a party. Not loud, not explaining the costume to everyone who asks. Just standing there like you already won the argument before it started.

The katana needs a plan before the party, not during it

A prop sword without a holster becomes a constant hand-holding problem the second you want to eat, drink, or dance. Decide on the hip holder or the back strap before you leave the house, not when you’re already at the venue and juggling a drink in one hand. If you go with the back strap, practice sitting down in it once. Some designs jab you in the spine the moment you lean back in a chair.

The corset will feel fine for the first two hours

Then it won’t. Boned corsets that fit well at 8pm start digging in by 11pm, especially if you’ve been sitting, eating, or dancing. Loosen the laces slightly before the discomfort starts rather than waiting until you’re uncomfortable enough to want to take the whole thing off in a bathroom. A slightly looser lace all night beats a tight one for three hours and nothing after that.

Octavia Blake Group Halloween Costume Ideas

Group Idea: The 100 Cast

The Delinquents & Grounders

Excellent group if your crowd watched the show. Octavia, Clarke, Bellamy, and Lexa cover the show’s core visual language of leather, armor, and Grounder war paint, and the mix of characters gives everyone a different silhouette to play with. This is the one group idea here that doesn’t need anyone to explain the reference to the others.

Octavia Blake Lexa Clarke Griffin Bellamy Blake

Group Idea: Post-Apocalyptic Icons

Dystopian Survivalist Queens

Strong group even for a crowd that hasn’t seen The 100. Furiosa, Katniss, and Ellie are all individually recognizable from their own franchises, and the shared thread of leather, weapons, and survivalist grit holds the group together visually without anyone needing to know Octavia specifically. This works better as a themed lineup than as a reference to one show.

Octavia Blake Furiosa Katniss Everdeen Ellie

Group Idea: Same Actor

The Marie Avgeropoulos Live-Action Roster

Might work, but only for a crowd that knows her filmography well beyond The 100. Myra from Jiu Jitsu, Nikki from Tracers, and Sandra Lowe from Dead Rising: Endgame are all played by Marie Avgeropoulos, which is a fun trivia hook, but none of those characters have strong individual visual recognition on their own. This is a group for a room full of her fans, not a general Halloween party.

Octavia Blake Myra Nikki Sandra Lowe

Group Idea: Same Name

The Octavia Monikers

Might work, but the connection here is the name and nothing else. Octavia from The Hunger Games prep team, Octavia from Helluva Boss, and Octavia Melody from My Little Pony share zero visual or tonal overlap with Octavia Blake. This one only lands as a joke if you announce the theme, since nobody will guess “same first name” on sight.

Octavia Blake Octavia (Helluva Boss) Octavia Melody Octavia (The Hunger Games)

Group Idea: Iconic Face Paint

Fierce Warriors with Iconic Face Paint

Strong group built around a real visual thread: Kratos’s red ash mark, William Wallace’s blue woad paint, and Floki’s heavy black eye makeup are all as recognizable as Octavia’s war paint line, even though the four come from completely different genres. The face paint carries the group even for people who don’t know all four sources.

Octavia Blake Kratos William Wallace Floki
Octavia Blake from The 100 standing outdoors in a dark leather jacket with a brown leather strap across her chest, hair partially pulled back with small side braids

Octavia Blake Halloween Costume DIY Tips

Building the Look

This costume has a lot of pieces, but most of them are layering, not sourcing. The two things that actually make or break the look are the wig and the face paint.

  • Wig: don’t skip this unless your hair is already dark and long enough for side braids.
  • War paint: a black cream eyeliner stick works fine. Draw one straight vertical line, set with powder.
  • Corset and leggings: any dark, fitted base pieces you own will substitute if you’re not buying new.
  • Harnesses and rings: pick one leg accessory, not all of them. More isn’t more here.
  • Katana: get a scabbard version. A bare blade at a party is a liability, not a costume choice.

Playing Octavia at the Party

Octavia doesn’t explain herself. She acts first and deals with the fallout after. That’s a useful energy to hold onto when someone asks who you are.

  • Keep your answers short. She’s not a talker, especially by the later seasons.
  • The katana works as a social prop. Holding something gives you a reason to stand still and look intense instead of hovering awkwardly near the snack table.
  • If someone asks about the face paint, that’s your opening. Most people will ask.
  • Don’t oversell the backstory. A short answer lands better than a full plot summary.

Octavia Blake Halloween Costume: FAQ

Start with the black braided wig and a fitted steampunk corset, then layer on brown chest armor and leg guards. Carry a katana in a hip holder or back strap, and finish with a hand drawn vertical black line down your forehead and nose. That paint line is what tells people you are Octavia and not a generic Grounder.

The 100 ended in 2020 and is not a current cultural reference point, so recognition depends entirely on whether your crowd watched the show. The war paint and full leather armor build still reads as a striking post apocalyptic warrior look on its own, even to people who never saw a single episode.

Octavia is played by Marie Avgeropoulos, a Canadian actress who appeared in all seven seasons of the series. The show aired on The CW from 2014 to 2020 and was developed by Jason Rothenberg.

Any straight, single edged prop sword works. What matters is that it has a scabbard so you can holster it, since carrying a bare blade around a crowded party all night is a real problem, not a costume detail.

Use a black cream eyeliner or face paint stick and draw one straight vertical line from your hairline down through the center of your nose. Set it with translucent powder so it does not smear. It is one line, not a design, which makes it one of the easier parts of this costume to get right.

Yes. Clarke, Bellamy, and Lexa are the most recognizable pairings, since they share the same visual language of leather and Grounder-influenced armor. The group only reads clearly to people who watched the show, so it works best with a crowd that already knows the series.