What color is Kris's skin in the Dark World?

Kris's skin turns a distinct light pastel blue when they enter the Dark World, which contrasts with their dark blue hair.

How do I make Kris's armor easily?

You can easily make the chest plate out of gray EVA foam sheets, draw on the panel lines with a ballpoint pen, and paint it with metallic silver acrylic paint.

Can I cosplay Ralsei instead?

Yes! A Ralsei costume requires a green wizard hat, a green tunic, a long pink scarf, and round black-rimmed glasses.

AI-generated example

Deltarune Costume

Step into the Dark World as Kris with this complete cosplay guide.

Deltarune is Toby Fox's beloved follow-up to Undertale, and its characters are massive favorites for conventions and Halloween. This guide focuses on Kris's iconic Dark World outfit, characterized by a striking blue, pink, and silver color palette. It is a fantastic choice for gamers who love atmospheric, story-driven RPGs and want a highly recognizable indie game look.

Difficulty: Medium
Time: ~120 min
Budget: $40–120

See yourself as Deltarune →What you need Buy the Deltarune costume

Try it on

See yourself as Deltarune

One clear photo of yourself; we render you in this costume — face untouched, full body, about 20 seconds.

Choose or drop a photo of yourselfJPG · PNG · HEIC

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.

Deltarune costume — Example look · AI-generated

You as Deltarune

Result

What you need for a Deltarune costume

Short on time? Buy it ready-made

Spirit Halloween sells the complete Deltarune costume — one box instead of 6 pieces.

Shop Deltarune at Spirit ↗

Blue skin paint or morph mask
Light blue face paint or a full-head light blue spandex mask to match Kris's Dark World skin tone.
DIY: Use a light blue open-face spandex hood.
Amazon
Silver chest armor plate
A silver metallic chest plate, which can be made from foam or purchased as a lightweight plastic costume piece.
DIY: Cut the chest plate shape out of EVA foam, paint it silver, and attach it with elastic straps.
Amazon
Dark blue bodysuit or tunic
A long-sleeved dark blue or navy blue base layer worn under the armor.
DIY: Use a plain navy blue long-sleeve t-shirt and matching leggings.
Amazon
Pink and purple cape
A short, lightweight cape that is bright pink on the outside and purple on the inside, draping over one shoulder.
DIY: Sew or safety-pin a yard of bright pink fabric to a purple backing fabric.
Amazon
Blue wig
A messy, medium-length dark blue wig with long bangs that partially cover the eyes.
DIY: Style a cheap black wig by spraying temporary blue hair color over it.
Amazon
Silver foam sword
A simple silver and blue prop sword to represent Kris's primary weapon.
DIY: Cut a sword shape out of sturdy cardboard and wrap it in silver duct tape.
Amazon

Rather not assemble it? See ready-made Deltarune costumes at Spirit Halloween ↗

How to put it together

1
Put on the dark blue bodysuit or long-sleeve shirt and pants base layer.
2
Apply the light blue face paint evenly over your face and neck, or pull on the blue spandex mask.
3
Put on the dark blue wig, styling the bangs forward so they drape over your eyes in a messy fashion.
4
Secure the silver chest armor over your torso using the attached straps.
5
Drape the pink and purple cape over your left shoulder, securing it to the armor strap with a safety pin.
6
Equip the silver prop sword to complete the Dark World warrior aesthetic.

Makeup & hair

Keep your face completely covered in light blue face paint, leaving the eyes shadowed. The dark blue wig should be messy and unkempt, with long bangs hanging down to obscure your upper face.

Deltarune for couples, groups, kids & more

couples: Pair Kris with Susie in her purple jacket and axe, or Ralsei in his green wizard hat and pink scarf.
group: Assemble the full Fun Gang with Kris, Susie, Ralsei, and Noelle.
kids: Use a blue hooded sweatshirt as a base and a soft felt chest plate for a comfortable, kid-friendly version.
Plus size: Use a flexible, oversized navy blue tunic as the base layer and adjust the foam armor straps for a comfortable fit.

Tips

If using face paint, set it with a translucent setting powder so it does not smudge onto your cape or armor.
Ensure your wig bangs are thin enough to see through safely while walking around at night or at a convention.
Keep the prop sword lightweight by using foam or cardboard, especially if carrying it for long hours.

Deltarune costume FAQ

What color is Kris's skin in the Dark World?: Kris's skin turns a distinct light pastel blue when they enter the Dark World, which contrasts with their dark blue hair.
How do I make Kris's armor easily?: You can easily make the chest plate out of gray EVA foam sheets, draw on the panel lines with a ballpoint pen, and paint it with metallic silver acrylic paint.
Can I cosplay Ralsei instead?: Yes! A Ralsei costume requires a green wizard hat, a green tunic, a long pink scarf, and round black-rimmed glasses.

Did you know? Deltarune is an anagram of Undertale, and many of its characters share thematic and visual parallels with the original game's cast.