---
title: "Ninja Birthday Party Decorations — $93K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/home-kitchen/ninja-birthday-party-decorations"
last_updated: "2026-08-06T16:14:24.776Z"
locale: en
meta:
description: "Niche score 50/100 · $93K/yr market · 121K searches/yr · $18.04 avg price. Soft demand (-16.4% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 50/100 · $93K/yr market · 121K searches/yr · $18.04 avg price. Soft demand (-16.4% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Ninja Birthday Party Decorations — $93K/yr Amazon US Niche (2026) - Flapen"
---
# **ninja birthday party decorations**
**Worth a look**
Shows a thin review moat (101 avg reviews), but soft demand (-16.4% this quarter) keeps it on the watch list.
Market size 23Growth 17Conversion 52Competition 73Returns 50Price range 76Avg price 83Brand share 80Review moat 95Quality gap 23
**Review moat**
**Great****101.17**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Great****$18.04**
avg listing price — sweet spot $15–$100
**Brand share**
**Great****55%**
top-5 brand share — no brand owns this niche
**Price range**
**Great****$6.92–$40.19**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Good****41%**
top-5 click share — leaders hold, buyers still browse
**Conversion**
**Good****4.3%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Okay****3.0%**
return rate — above 5% kills the launch gate
**Market size**
**Bad****$93K**
$93K/yr · 121K searches
**Quality gap**
**Bad****4.6★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-16.4%**
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, ninja birthday party decorations is a $93K/yr Amazon United States market (121K searches/yr). The top 5 brands hold 55% of demand. Verdict: Worth a look — 50/100.
Data updated Jul 23, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **ninja birthday party decorations market data**
- **Units sold / yr**
- **6K–8K**
- avg 100–250/product
- **Revenue / yr**
- **$108K–$144K**
- units × avg price
- **Conversion rate**
- **4.3%**
- **Avg BSR**
- **#2,188**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **91%**
- **Out of stock**
- **5.3%**
- **Avg brand age**
- **34 months**
- **Avg seller age**
- **173 days**
## **Competition & brand share**
The top 5 products take 41% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**26 **▼falling
**Sellers**
**27**
**Top-5 brand share**
**55%**
Top 20: 95%
**Top-5 click share**
**41%**
Top 20: 84%
**Open market**
**41%**
- Bezkega22% - Tevxj15% - ZOIIWA7% - ZHUOWEISM6% - Eerrhhaq5% - BOIKOKY5%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -16.4% search growth over the last 90 days.
4K3KSpike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.9×
[**Open Trend **](https://flapen.com/research/us/home-kitchen/ninja-birthday-party-decorations/trend)
## **Top ninja birthday party decorations search terms**
- **ninja birthday party decorations**39K/yr-15.4%3.7% conv. - **ninja party decorations**24K/yr-19.4%3.9% conv. - **ninja party**12K/yr-1.4%1.8% conv. - **ninja birthday**9K/yr-20.9%2.9% conv. - **ninja birthday decorations**7K/yr+11.8%3.2% conv. - **ninja decorations**5K/yr+4.6%3.0% conv. - **ninja kids birthday party decorations**6K/yr-19.0%1.7% conv. - **ninja birthday party**6K/yr-35.0%3.0% conv. - **ninja party supplies**5K/yr-13.4%2.5% conv. - **ninja kidz party decorations**8K/yr-52.8%0.5% conv. [**All search terms **](https://flapen.com/research/us/home-kitchen/ninja-birthday-party-decorations/search-terms)
## **Top ninja birthday party 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%4%$4K8%$7K12%$11K16%$15K1101001K 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**Ninja Birthday Party Decorations Tableware 193pcs Ninja Warrior Party Decorations Plates and Napkins Cups Tablecloths Cake Topper Balloon for Ninja Party Supplies Serves 24**Bezkega**$25.69**4.6★16 rev](https://www.amazon.com/dp/B0G6KNFWQX) [2**162 Pcs Ninja Birthday Party Decoration Set Ninja Warrior Party Supplies Kit Includes Karate Master Tableware Tablecloth Hanging Banners Foil Swirls Cutouts Balloons for Kids Boys Karate Party Favors**Tevxj**$25.86**4.7★157 rev](https://www.amazon.com/dp/B0BS3V35GV) [3**98 Pieces Ninja Birthday Party Decorations Ninja Warrior Tableware Set Karate Plates Napkins Tablecloth Ninja Master Birthday Party Supplies Kit Table Cover Dinnerware Party Favors**Tevxj**$20.80**4.7★775 rev](https://www.amazon.com/dp/B0BR7V2Z7W) [4**Eerrhhaq 12 Pcs Inflatable Ninja Samurai Sword Inflated Katana Sword Toy Blow Up Ninja Swords for Party Favors Cosplay Samurai Theme Party**Eerrhhaq**$13.47**4.2★129 rev](https://www.amazon.com/dp/B0CWXSVSTV) [5**Ninja Birthday Party Decoration Tableware Set 142pcs Plates and Napkins Supplies Include Warrior Plates Napkin Cups Tablecloth Banner for Ninja Master Birthday Decor**Bezkega**$23.24**4.8★66 rev](https://www.amazon.com/dp/B0CP8STF6M)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**NeoRov 301 Pcs Ninja Birthday Party Decorations Tableware Balloon Arch Set**NeoRov**$29.00**8 rev3mo ago](https://www.amazon.com/dp/B0GX1G1S5N) [**Ninja Birthday Party Decorations Tableware 193pcs Ninja Warrior Party Decorations Plates and Napkins Cups Tablecloths Cake Topper Balloon for Ninja Party Supplies Serves 24**Bezkega**$25.69**16 rev7mo ago](https://www.amazon.com/dp/B0G6KNFWQX) [**Bafeil 3 Pcs Ninja Birthday Party Porch Banner with Fringe Backdrop Curtains Warrior Theme Party Decorations Ninja Door Hanging Banner Party Supplies for Karate Master Birthday Photo Booth Props**Bafeil**$15.40**14 rev7mo ago](https://www.amazon.com/dp/B0G6DCSQLT) [**Holkcog Ninja Birthday Party Decorations Martial Arts Karate Kung Fu Themed Party Banner Hanging Decor Spirals Swirls Bollons Red and Black for Party Decor Cosplay Samurai Theme Baby Shower Party**Holkcog**$18.74**12 rev8mo ago](https://www.amazon.com/dp/B0G3TLHPGD) [**12 Pack Ninja Party Favors for Kids - Individually Wrapped Paint Your Own Wooden Craft Kits Boy Birthday Decorations & Kidz Party Supplies 4-8 8-12 Goodie Bag Stuffers**BOIKOKY**$19.82**48 rev11mo ago](https://www.amazon.com/dp/B0FDJSSTR5)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**NeoRov 301 Pcs Ninja Birthday Party Decorations Tableware Balloon Arch Set**NeoRov**$29.00**5.0★**▲ 373%**](https://www.amazon.com/dp/B0GX1G1S5N) [**Bafeil 3 Pcs Ninja Birthday Party Porch Banner with Fringe Backdrop Curtains Warrior Theme Party Decorations Ninja Door Hanging Banner Party Supplies for Karate Master Birthday Photo Booth Props**Bafeil**$15.40**4.8★**▲ 175%**](https://www.amazon.com/dp/B0G6DCSQLT) [**Holkcog Ninja Birthday Party Decorations Martial Arts Karate Kung Fu Themed Party Banner Hanging Decor Spirals Swirls Bollons Red and Black for Party Decor Cosplay Samurai Theme Baby Shower Party**Holkcog**$18.74**5.0★**▲ 147%**](https://www.amazon.com/dp/B0G3TLHPGD) [**Ninja Birthday Party Decorations Tableware 193pcs Ninja Warrior Party Decorations Plates and Napkins Cups Tablecloths Cake Topper Balloon for Ninja Party Supplies Serves 24**Bezkega**$25.69**4.6★**▲ 135%**](https://www.amazon.com/dp/B0G6KNFWQX) [**ZOIIWA 48Pcs Karate Headbands Birthday Party Favors Red Karate Themed Headbands Party Decorations for Kids Boys Girls Adults Birthday Party Supplies Costumes Decorations and Gifts Adjustable Size**ZOIIWA**$12.04**4.4★**▲ 101%**](https://www.amazon.com/dp/B0CYPXQK3B)
**~~View all trending →~~**
## **What buyers say about ninja birthday party decorations**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**17%
*“Its a great kit”*
**Color**15%
*“colorful”*
**Fun/Entertainment Experience**15%
*“Very fun for birthday party”*
**Design-Overall**9%
*“so the theme was perfect”*
**Advertised Vs Actual Product**9%
*“Arrived as pictured”*
**Value For Money**6%
*“Good for the money”*
**Assembly/Installation**6%
*“looked great once everything was put together”*
**Durability**3%
*“The plates were durable for pizza”*
**Size-Overall**3%
*“Great size and quality”*
**Ease Of Use**3%
*“It's convenient”*
### **What buyers complain about **
**Inflation/Deflation**13%
*“most of them deflated with play”*
**Strength**10%
*“The plates are a little flimsy”*
**Thickness**10%
*“The balloons were the only issue—some came a little thin”*
**Quality-Overall**8%
*“Needs quality control”*
**Paint Quality**6%
*“A couple of the paints were a bit dried out”*
**Size-Overall**6%
*“They were just a lot smaller than expected from the pictures”*
**Material Quality**5%
*“The headbands were a cheap almost plastic type cloth that was stiff and rough”*
**Smell**4%
*“Yes, when you first open this you might smell that funny smell,”*
**Assembly/Installation**4%
*“needs to be clearer that its not assembled”*
**Allergies**3%
*“Material is itchy plastic”*
### **Top return reasons **
**Size-Overall**18%
**Material Quality**17%
**Quality-Overall**14%
**Advertised Vs Actual Product**13%
**Value For Money**7%
**Defective Material/Parts**6%
**Color**3%
**Functionality-Overall**3%
**Thin**3%
**Inflation/Deflation**3%
## **Common questions**
- **Is ninja birthday party decorations profitable to sell on Amazon United States?**
- The niche generates $93K/yr across 35 tracked products. 2 of 8 products launched in the last 360 days are still selling. 90-day search growth is -16.4%. Flapen's verdict: Worth a look (50/100).
- **How competitive is the ninja birthday party decorations niche?**
- 26 brands and 27 sellers compete. The top 5 products take 41% of clicks and top 5 brands hold 55% of demand.
- **What do buyers complain about in ninja birthday party decorations?**
- Top complaints mined from reviews: Inflation/Deflation, Strength, Thickness. The return rate is 3.0%.
- **When does demand for ninja birthday party decorations peak?**
- Demand is steady year-round — the busiest month runs 1.9× the quietest.
- **What does it cost to enter the ninja birthday party decorations niche?**
- Listings span $6.92–$40.19; the average listing price is $18.04 (sweet spot $15–$100). The average incumbent carries 101 reviews — the moat a new listing must climb.
## **Related niches in Home & Kitchen**
- 74 [**graduation centerpieces for tables 2023**](https://flapen.com/research/us/home-kitchen/graduation-centerpieces-for-tables-2023)$368K/yr+228.8%**Worth a look**- 74 [**artificial hanging flowers for outdoors**](https://flapen.com/research/us/home-kitchen/artificial-hanging-flowers-for-outdoors)$1.2M/yr+77.3%**Launch it**- 74 [**5th grade graduation decorations**](https://flapen.com/research/us/home-kitchen/5th-grade-graduation-decorations)$149K/yr+666.7%**Worth a look**- 74 [**green graduation decorations class of 2023**](https://flapen.com/research/us/home-kitchen/green-graduation-decorations-class-of-2023)$190K/yr+184.6%**Worth a look**- 74 [**flowers**](https://flapen.com/research/us/home-kitchen/flowers)$23.3M/yr+5.2%**Launch it**- 74 [**pool towel rack outdoor**](https://flapen.com/research/us/home-kitchen/pool-towel-rack-outdoor)$1.1M/yr+362.1%**Launch it**[**All Home & Kitchen niches **](https://flapen.com/research/us/home-kitchen)