Lady Rainicorn Costume
Bring Adventure Time's colorful, Korean-speaking rainicorn-unicorn hybrid to life.
Lady Rainicorn is Princess Bubblegum's loyal, Korean-speaking royal pet and Jake the Dog's girlfriend from Adventure Time. Fans love this character for her vibrant, whimsical design and sweet personality. A human-version costume translates her look into a bright rainbow outfit paired with a long yellow mane and a unicorn horn.
- Difficulty
- Easy
- Time
- ~45 min
- Budget
- $30–75
Try it on
See yourself as Lady Rainicorn
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 Lady Rainicorn costume
Short on time? Buy it ready-made
Spirit Halloween sells the complete Lady Rainicorn costume — one box instead of 5 pieces.
Rainbow striped dress or jumpsuit
A form-fitting bodycon dress, oversized sweater dress, or full-body jumpsuit featuring horizontal rainbow stripes (pink, red, orange, yellow, green, blue, purple).
DIY: Fabric paint horizontal rainbow stripes onto a plain white long-sleeve dress or white jumpsuit.
Unicorn horn headband
A soft white or gold plush unicorn horn attached to a comfortable headband.
DIY: Roll white felt into a cone shape, stuff it with cotton, wrap gold ribbon around it, and glue it to a plain headband.
Long yellow wig
A waist-length, bright yellow or golden-blonde wig with soft waves to mimic her flowing mane.
DIY: Use your natural hair if it is long and blonde, or spray temporary yellow hair color onto a light-colored wig.
White tights or leggings
Solid, opaque white tights to represent her white legs and hooves.
Pink or white flats
Simple pink or white ballet flats or canvas slip-on shoes.
Rather not assemble it? See ready-made Lady Rainicorn costumes at Spirit Halloween ↗
How to put it together
- 1
Put on the opaque white tights or leggings as your base layer.
- 2
Slip on the horizontal rainbow-striped dress or jumpsuit.
- 3
Style the long yellow wig, brushing it gently to keep it smooth and flowing over your shoulders.
- 4
Place the white unicorn horn headband securely on your head, positioning it just behind the wig's bangs or front hairline.
- 5
Step into your pink or white ballet flats.
- 6
Optional: Add a plush Jake the Dog prop to carry around to complete the Adventure Time couple dynamic.
Makeup & hair
Keep makeup bright and whimsical with pink eyeshadow, a touch of face glitter on the cheekbones, and soft pink lipstick. Wear a long, flowing yellow wig styled with soft waves to represent her mane.
Lady Rainicorn for couples, groups, kids & more
- couples
- Pair up with Jake the Dog (wearing a yellow morph suit or bulldog ears) or Princess Bubblegum (in a pink gown with a gold crown).
- group
- Join a full Adventure Time group with Finn the Human, Jake, Princess Bubblegum, and Marceline.
- kids
- Use a rainbow tutu skirt, white leggings, a yellow knit hat with a soft white felt horn attached, and a pink shirt.
- Plus size
- An oversized rainbow knit sweater dress paired with white leggings offers a comfortable, cozy, and highly accurate silhouette.
- pet
- A small rainbow-striped dog sweater paired with a soft, lightweight strap-on unicorn horn.
Tips
- Choose a dress or jumpsuit with horizontal stripes rather than vertical ones to match her segmented body look from the show.
- If wearing a long wig, keep a wide-tooth comb handy to gently detangle the synthetic fibers throughout the night.
- For outdoor events in cool weather, layer a long-sleeve white undershirt beneath your rainbow dress.
Lady Rainicorn costume FAQ
- What does a Lady Rainicorn costume look like?
- It features a horizontal rainbow-striped dress or jumpsuit, a long pastel yellow wig representing her mane, white tights, and a white unicorn horn headband.
- How do you make a DIY Lady Rainicorn horn?
- Roll white felt or craft foam into a cone, hot glue the seam, wrap a gold string or ribbon spiraling up the cone, and glue the finished horn onto a plastic headband.
- Who can I pair with for a couples costume?
- Lady Rainicorn pairs perfectly with Jake the Dog, her boyfriend in Adventure Time, or Princess Bubblegum, her royal owner and best friend.
Did you know? In Adventure Time, Lady Rainicorn speaks exclusively in Korean, which is translated via subtitles or a universal translator device in a few episodes.