---
title: "Demon Slayer Birthday Decorations — $280K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/home-kitchen/demon-slayer-birthday-decorations"
last_updated: "2026-08-05T22:54:26.640Z"
locale: en
meta:
description: "Niche score 49/100 · $280K/yr market · 456K searches/yr · $18.38 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 49/100 · $280K/yr market · 456K searches/yr · $18.38 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Demon Slayer Birthday Decorations — $280K/yr Amazon US Niche (2026) - Flapen"
---
# **demon slayer birthday decorations**
**Skip it**
Soft demand (-24.6% this quarter) — this niche doesn't clear our bar today.
Market size 50Growth 13Conversion 42Competition 51Returns 87Price range 73Avg price 83Brand share 37Review moat 97Quality gap 30
**Review moat**
**Incredible****55.81**
avg incumbent reviews — the moat a new listing must climb
**Returns**
**Great****1.4%**
return rate — above 5% kills the launch gate
**Avg price**
**Great****$18.38**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$6.95–$36.79**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Good****54%**
top-5 click share — leaders hold, buyers still browse
**Market size**
**Good****$280K**
$280K/yr · 456K searches
**Conversion**
**Okay****3.3%**
search→purchase rate — share of searches ending in a sale
**Brand share**
**Okay****83%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-24.6%**
90-day search growth — must beat 0% to launch
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500")
According to Flapen's Amazon United States niche tracking, demon slayer birthday decorations is a $280K/yr Amazon United States market (456K searches/yr). The top 5 brands hold 83% of demand. Demand peaks in Sep–Oct. Verdict: Skip it — 49/100.
Data updated Jul 23, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **demon slayer birthday decorations market data**
- **Units sold / yr**
- **15K–20K**
- avg 250–500/product
- **Revenue / yr**
- **$276K–$368K**
- units × avg price
- **Conversion rate**
- **3.3%**
- **Avg BSR**
- **#2,484**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **54%**
- **Out of stock**
- **8.5%**
- **Avg brand age**
- **22 months**
- **Avg seller age**
- **171 days**
## **Competition & brand share**
The top 5 products take 54% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**15 **▲rising
**Sellers**
**16**
**Top-5 brand share**
**83%**
Top 20: 100%
**Top-5 click share**
**54%**
Top 20: 93%
**Open market**
**14%**
- Generic35% - SDONY33% - Babymiu6% - deenor5% - Jinrea4% - Quatrely3% - Open — no brand owns it (9 brands, 14%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -24.6% search growth over the last 90 days.
13K8KSpike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Sep, Oct · busiest ÷ quietest = 2.5×
[**Open Trend **](https://flapen.com/research/us/home-kitchen/demon-slayer-birthday-decorations/trend)
## **Top demon slayer birthday decorations search terms**
- **demon slayer birthday decorations**154K/yr-21.5%2.2% conv. - **demon slayer party decorations**61K/yr-21.8%2.4% conv. - **demon slayer cake topper**39K/yr-21.8%2.6% conv. - **demon slayer birthday**30K/yr-21.0%2.0% conv. - **demon slayer party favors**30K/yr-32.8%1.8% conv. - **demon slayer decorations**20K/yr-34.5%1.9% conv. - **demon slayer party**21K/yr-38.5%1.8% conv. - **nezuko birthday decorations**11K/yr-5.2%1.4% conv. - **demon slayer balloons**14K/yr-20.8%0.9% conv. - **demon slayer cake decorations**14K/yr-16.5%2.8% conv. [**All search terms **](https://flapen.com/research/us/home-kitchen/demon-slayer-birthday-decorations/search-terms)
## **Top demon slayer birthday decorations products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%5%$14K10%$28K15%$42K20%$56K1101001K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**demon birthday party decorationsAnime theme party supplies Including banners balloons tablecloths dinner plates etc.**Generic**$35.22**4.7★95 rev](https://www.amazon.com/dp/B0FKYLX9ZJ) [2**132Pcs Demon-themed birthday party decorations and party supplies cake toppers spiral hangings dinner plates tablecloths stickers**Generic**$32.74**4.7★111 rev](https://www.amazon.com/dp/B0FFY3K6MH) [3**Demon Birthday Decorations Slayer Party Supplies Include Happy Birthday Banner Cake Topper and Cupcake Toppers Balloons for Kids Party Decor**SDONY**$21.94**4.6★19 rev](https://www.amazon.com/dp/B0G1XRG18W) [4**25pcs Demon Cake Decorations with 1pcs Cake Topper 24pcs Cupcake Toppers for Slayer Birthday Party Supplies**SDONY**$12.96**4.7★36 rev](https://www.amazon.com/dp/B0G1XMJX9R) [5**Babymiu Anime Birthday Party Decoration Pack with Tapestry43pcsIncludes Cake Toppers Cupcake Toppers Balloons Banner Party Supplies Favors Merch For Adults Boys Girls Teens**Babymiu**$25.86**4.2★8 rev](https://www.amazon.com/dp/B0FM7SHRTK)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**30pcs Demon Cake Decorations with 30pcs Cupcake Toppers Party Supplies for Slayer Themed Birthday Decorations**EKIH**$9.99**1 rev2mo ago](https://www.amazon.com/dp/B0H1QNNY8P) [**139 PCS Anime Party Decorations Set with Banner Balloons Hanging Swirl Stickers Tablecloth Tableware for Adult Theme Party Supplies**WOOACME**$17.59**1 rev2mo ago](https://www.amazon.com/dp/B0GYNCPTMF) [**Jinrea Popular Anime Birthday Number 11 Candles Comic Book Themed Candles Anime-Themed Decorations Suitable for Party Celebrations Birthday Decorations11**Jinrea**$9.00**1 rev3mo ago](https://www.amazon.com/dp/B0GRVYWZP3) [**24Pcs Demon Themed Birthday Decorations Anime Party Supplies.Party Popcorn Boxes.**Generic**$10.28**2 rev4mo ago](https://www.amazon.com/dp/B0GSJ3NHKG) [**120PCS Demon Anime Party Supplies for Boy Girls Kids Cartoons Birthday Party Decorations Tableware Set Plates Napkins Cups Set for 20 Guests**Rejoice Bunny**$17.79**268 rev6mo ago](https://www.amazon.com/dp/B0GD16DQQ7)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**30pcs Demon Cake Decorations with 30pcs Cupcake Toppers Party Supplies for Slayer Themed Birthday Decorations**EKIH**$9.99**5.0★**▲ 280%**](https://www.amazon.com/dp/B0H1QNNY8P) [**139 PCS Anime Party Decorations Set with Banner Balloons Hanging Swirl Stickers Tablecloth Tableware for Adult Theme Party Supplies**WOOACME**$17.59**5.0★**▲ 278%**](https://www.amazon.com/dp/B0GYNCPTMF) [**24Pcs Demon Themed Birthday Decorations Anime Party Supplies.Party Popcorn Boxes.**Generic**$10.28**5.0★**▲ 277%**](https://www.amazon.com/dp/B0GSJ3NHKG) [**Jinrea Popular Anime Birthday Number 11 Candles Comic Book Themed Candles Anime-Themed Decorations Suitable for Party Celebrations Birthday Decorations11**Jinrea**$9.00**5.0★**▲ 244%**](https://www.amazon.com/dp/B0GRVYWZP3) [**120PCS Demon Anime Party Supplies for Boy Girls Kids Cartoons Birthday Party Decorations Tableware Set Plates Napkins Cups Set for 20 Guests**Rejoice Bunny**$17.79**4.8★**▲ 126%**](https://www.amazon.com/dp/B0GD16DQQ7)
**~~View all trending →~~**
## **What buyers say about demon slayer birthday decorations**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**26%
*“Great variety”*
**Value For Money**11%
*“Value is decent”*
**Advertised Vs Actual Product**11%
*“accurate in the listing”*
**Size-Overall**8%
*“Just the right size and quantity”*
**Gifting Purpose**7%
*“Great Gift”*
**Design-Overall**5%
*“Look beautiful”*
**Fun/Entertainment Experience**5%
*“Fun”*
**Color**4%
*“Colors nice”*
**Assembly/Installation**3%
*“Cute easy to assemble gives your cup cakes a professional look”*
**Durability**3%
*“durable - sturdy”*
### **What buyers complain about **
**Quality-Overall**28%
*“I mean the fact that its low quality might make it funnier”*
**Size-Overall**20%
*“stands don't fit”*
**Advertised Vs Actual Product**12%
*“Not as advertised”*
**Color**10%
*“Colors were off”*
**Material Quality**4%
*“Each figure is made of cheap plastic very flexible very bendy that's bad”*
**Smell**3%
*“The balloons have a very chemical odor”*
**Strength**2%
*“They feel a bit flimsy and look cheap”*
**Gifting Purpose**2%
*“Terrible gift quality”*
**Durability**2%
*“they break easy”*
**Functionality-Overall**2%
*“doesn't work”*
### **Top return reasons **
**Advertised Vs Actual Product**23%
**Size-Overall**21%
**Quality-Overall**15%
**Color**11%
**Defective Material/Parts**11%
**Value For Money**4%
**Material Quality**2%
**Degree Of Motion**2%
**Adhesion/Stickiness**2%
**Shape/Style**1%
## **Common questions**
- **Is demon slayer birthday decorations profitable to sell on Amazon United States?**
- The niche generates $280K/yr across 26 tracked products. 6 of 20 products launched in the last 360 days are still selling. 90-day search growth is -24.6%. Flapen's verdict: Skip it (49/100).
- **How competitive is the demon slayer birthday decorations niche?**
- 15 brands and 16 sellers compete. The top 5 products take 54% of clicks and top 5 brands hold 83% of demand.
- **What do buyers complain about in demon slayer birthday decorations?**
- Top complaints mined from reviews: Quality-Overall, Size-Overall, Advertised Vs Actual Product. The return rate is 1.4%.
- **When does demand for demon slayer birthday decorations peak?**
- Demand peaks in Sep–Oct; the busiest month runs 2.5× the quietest.
- **What does it cost to enter the demon slayer birthday decorations niche?**
- Listings span $6.95–$36.79; the average listing price is $18.38 (sweet spot $15–$100). The average incumbent carries 56 reviews — the moat a new listing must climb.
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