rumi costume
Worth a lookShows a $2.5M/yr market, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size
Incredible$2.5M$2.5M/yr · 8.0M searches
Avg price
Incredible$38.52avg listing price — sweet spot $15–$100
Review moat
Great148.13avg incumbent reviews — the moat a new listing must climb
Price range
Great$9.56–$93.19cheapest to priciest tracked listing — scored on the share inside $15–$100
Brand share
Great51%top-5 brand share — no brand owns this niche
Quality gap
Great4.2★avg incumbent rating — lower means beatable quality
Competition
Great34%top-5 click share — an open shelf
Returns
Bad7.5%return rate — above 5% kills the launch gate
Conversion
Bad0.8%search→purchase rate — share of searches ending in a sale
Growth
Bad-36.3%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, rumi costume is a $2.5M/yr Amazon United States market (8.0M searches/yr). The top 5 brands hold 51% of demand. Verdict: Worth a look — 61/100.
Data updated Jul 10, 2026 · scored weekly · How we score niches
rumi costume market data
- Units sold / yr
- 60K–80K
- avg 500–750/product
- Revenue / yr
- $2.3M–$3.1M
- units × avg price
- Conversion rate
- 0.8%
- Avg BSR
- #4,971
- Page quality
- 0%
- Prime
- 76%
- Sponsored
- 74%
- Out of stock
- 46.3%
- Avg brand age
- 21 months
- Avg seller age
- 170 days
Competition & brand share
Clicks spread well past the top 5 (34% combined) — an open shelf where new products get seen.Brands
26
Sellers
30
Top-5 brand share
51%
Top 20: 94%
Top-5 click share
34%
Top 20: 71%
Open market
44%
- WYYXXT19%
- AOVCLKID11%
- FENGLONG-YB8%
- JIEANYAN7%
- RUXINRUA6%
- Lgandpg5%
Demand
Weekly Amazon search volume, last 46 weeks — -36.3% search growth over the last 90 days.Top rumi costume search terms
- rumi costume kids4.5M/yr
- rumi costume1.1M/yr
- disfraz de rumi para nia164K/yr
- rumi kpop demon hunters costume372K/yr
- k-pop demon hunters costume rumi506K/yr
- rumi costume girls146K/yr
- kpop demon hunters costume rumi255K/yr
- kpop demon hunters rumi costume93K/yr
- kpop rumi costume kids74K/yr
- rumi golden costume70K/yr
Top rumi costume 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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
WYYXXT 2Pcs Girls Rumi Princess Loose Comfortable Home Wear Dress 5-6 Years Multicolor
WYYXXT$24.055.0★3 rev
Purple Braiding Hair 24Inch 3 Packs Braiding Hair Pre Stretched Colored Hair Extensions for Twist or Box Braids Long Synthetic Crochet Braids for Stage Party Christmas Halloween Costume Cosplay
JIEANYAN$10.884.6★663 rev
WYYXXT Girls Rumi Princess Cartoon Daily Dress Halloween Birthday Party Pop Outfits(4-5T Yellow)
WYYXXT$23.544.2★3 rev
FENGLONG-YB Costume Cosplay Golden For Girls Women With Wigs Halloween Top Pants Full Set Outfit
FENGLONG-YB$74.783.6★95 rev
RUXINRUA Girls Cosplay Costume 3-13 Years Kids Lining Jacket Shorts 3PCS Uniform Outfits with Wig (5-6 years)
RUXINRUA$42.504.8★48 rev
Newest
by launch date
ZBDFNJ Yellow Clothing Blue Clothing Complete Set of Tops Pants Wig Accessories Theme Party Outfit
ZBDFNJ$34.751 rev
AOVCLKID Girls Rumi Princess Loose Comfortable Home Wear Dress 7-8 Years Yellow/Gold
AOVCLKID$21.189 rev
AOVCLKID Girls Rumi Princess Loose Comfortable Home Wear Dress 5-6 Years Yellow/Gold
AOVCLKID$21.039 rev
KPJSDT Girls Stage Costume Jacket Tank Top Shorts Set Printed Halloween Outfit for Kids Party Dress Up
KPJSDT$29.6510 rev
WYYXXT Girls Rumi Princess Cartoon Daily Dress Halloween Birthday Party Pop Outfits(4-5T Yellow)
WYYXXT$23.543 rev
Trending
90-day click momentumAOVCLKID Girls Rumi Princess Loose Comfortable Home Wear Dress 5-6 Years Yellow/Gold
AOVCLKID$21.034.8★
KPJSDT Girls Stage Costume Jacket Tank Top Shorts Set Printed Halloween Outfit for Kids Party Dress Up
KPJSDT$29.653.9★
ZBDFNJ Yellow Clothing Blue Clothing Complete Set of Tops Pants Wig Accessories Theme Party Outfit
ZBDFNJ$34.755.0★
RUXINRUA Girls Cosplay Costume 3-13 Years Kids Lining Jacket Shorts 3PCS Uniform Outfits with Wig (5-6 years)
RUXINRUA$42.504.8★
AOVCLKID Girls Rumi Princess Loose Comfortable Home Wear Dress 7-8 Years Yellow/Gold
AOVCLKID$21.184.8★
What buyers say about rumi costume
What buyers praise and complain about, mined from review topics.What buyers love
“The size was accurate”
“Great quality for this wig”
“I definitely think it was affordable and totally worth every penny for all the smiles and excitement”
“Color was accurate”
“They are comfortable”
“Did the job”
“Ease to use”
“soft material”
“The material feel soft and smooth”
“Accurate design”
What buyers complain about
“Bad quality”
“Easily broke”
“Runs extremely large”
“Not worth the money”
“The shorts fade after one wash to a gray color”
“so thin for the price the material could have been a lot better”
“is fragile”
“I was expecting cheap materials and crooked prints”
“also that this was resold it was for a birthday party this weekend so gross especially when purchased as a new item for it came with no tags just in a plastic bag”
“broke very easily”
Top return reasons
Common questions
- Is rumi costume profitable to sell on Amazon United States?
- The niche generates $2.5M/yr across 46 tracked products. 17 of 45 products launched in the last 360 days are still selling. 90-day search growth is -36.3%. Flapen's verdict: Worth a look (61/100).
- How competitive is the rumi costume niche?
- 26 brands and 30 sellers compete. The top 5 products take 34% of clicks and top 5 brands hold 51% of demand.
- What do buyers complain about in rumi costume?
- Top complaints mined from reviews: Quality-Overall, Durability, Size-Overall. The return rate is 7.5% — above our launch gate.
- What does it cost to enter the rumi costume niche?
- Listings span $9.56–$93.19; the average listing price is $38.52 (sweet spot $15–$100). The average incumbent carries 148 reviews — the moat a new listing must climb.