Alex Mercer Costume
Unleash the virus with this layered, action-ready anti-hero look.
Alex Mercer is the shape-shifting protagonist of the action-adventure video game Prototype. Fans choose this costume for its gritty, urban aesthetic and the opportunity to craft his iconic mutated biomass weapons. The look is defined by a highly specific layered jacket combination and a signature red dragon emblem.
- Difficulty
- Medium
- Time
- ~45 min
- Budget
- $60–180
Try it on
See yourself as Alex Mercer
One clear photo of yourself; we render you in this costume — face untouched, full body, about 20 seconds.
One render, $1. No account needed — if it fails you're not charged. Pricing.
Your photo is sent to Google's Gemini API to make the render and isn't used for training. Renders are AI-generated and labelled.
Want a different costume on this photo, or a whole group in costume? Open the Try-On Studio.
What you need for a Alex Mercer costume
Short on time? Buy it ready-made
Spirit Halloween sells the complete Alex Mercer costume — one box instead of 6 pieces.
Alex Mercer Leather Jacket
A black faux-leather jacket featuring a stand-up collar, white stripes on the sleeves, and a red tribal dragon embroidered on the back.
DIY: Take a plain black leather jacket, paint white stripes on the upper sleeves, and stencil a red tribal dragon design onto the back using acrylic leather paint.
Grey Zip-Up Hoodie
A classic heather grey or charcoal grey zip-up hoodie worn open underneath the leather jacket.
White Button-Down Shirt
A plain white collared dress shirt, worn partially unbuttoned at the collar.
Dark Blue Jeans
Standard straight-cut or relaxed-fit dark blue denim jeans with a slightly worn-in look.
Black Combat Boots
Sturdy black leather combat boots or work boots.
Mutated Blade Arm Prop
A prop replicating his black-and-red biomass blade arm, made from foam or lightweight plastic.
DIY: Cut the blade shape out of EVA foam, coat it in plastidip, paint it black with red organic vein details, and attach a handle inside to hold it.
Rather not assemble it? See ready-made Alex Mercer costumes at Spirit Halloween ↗
How to put it together
- 1
Put on the white button-down shirt, leaving the top two buttons undone for a casual look.
- 2
Layer the grey zip-up hoodie over the white shirt, leaving the zipper completely open.
- 3
Put on the dark blue jeans and secure them with a simple black belt.
- 4
Put on the signature Alex Mercer black leather jacket over the hoodie, pulling the hoodie's hood out so it rests over the jacket collar.
- 5
Lace up your black combat boots, tucking the cuffs of the jeans slightly into the tops of the boots.
- 6
Equip the mutated blade arm prop on your right arm, or carry it as your primary prop for photos.
Makeup & hair
Keep your hair short, messy, and dark brown or black, styled with a bit of hair gel for a windblown look. Apply light grey eyeshadow under your eyes to create a tired, infected, or intense expression.
Alex Mercer for couples, groups, kids & more
- couples
- Pair up with James Heller from Prototype 2, or a scientist in a hazmat suit representing Gentek.
- group
- Gather a group featuring Alex Mercer, James Heller, Blackwatch soldiers, and infected monsters.
- kids
- A simplified version with a black windbreaker featuring a painted red dragon, a grey hoodie, and blue jeans.
- Plus size
- Opt for a relaxed-fit leather jacket and a stretch-fabric grey hoodie for comfortable layering.
Tips
- Layering a leather jacket over a hoodie can get very warm; choose a lightweight hoodie to prevent overheating indoors.
- Make sure the hood of your grey hoodie is pulled out and draped over the back of the leather jacket collar.
- Practice posing with your blade arm prop held low and slightly behind you for a dynamic, menacing stance in photos.
Alex Mercer costume FAQ
- What is the logo on the back of Alex Mercer's jacket?
- It is a stylized, tribal-style red dragon emblem printed or embroidered between the shoulder blades.
- How do I make the mutated blade arm?
- You can craft it by layering sheets of EVA foam around a central PVC pipe handle, carving the organic blade texture, and painting it with black and glossy red acrylics.
- Can I wear this as an everyday outfit?
- Yes, without the blade arm prop, the jacket, hoodie, and jeans combination looks like stylish, normal streetwear.
Did you know? Alex Mercer's design was intentionally kept grounded in realistic, gritty streetwear to contrast with his monstrous, over-the-top shape-shifting abilities.