rumi costume
Worth a lookShows a sweet-spot price point ($22.95 avg), but soft demand (-56.4% this quarter) keeps it on the watch list.
Avg price
Incredible£22.95avg listing price — sweet spot $15–$100
Review moat
Great118.42avg incumbent reviews — the moat a new listing must climb
Quality gap
Great4.1★avg incumbent rating — lower means beatable quality
Price range
Great£10.60–£31.74cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Good40%top-5 click share — leaders hold, buyers still browse
Returns
Good2.3%return rate — above 5% kills the launch gate
Market size
Good£483K£483K/yr · 1.3M searches
Brand share
Okay84%top-5 brand share — brands hold most of the demand
Conversion
Bad1.6%search→purchase rate — share of searches ending in a sale
Growth
Bad-56.4%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United Kingdom niche tracking, rumi costume is a £483K/yr Amazon United Kingdom market (1.3M searches/yr). The top 5 brands hold 84% of demand. Verdict: Worth a look — 54/100.
Data updated Jul 29, 2026 · scored weekly · How we score niches
rumi costume market data
- Units sold / yr
- 13K–15K
- avg 100–250/product
- Revenue / yr
- £287K–£344K
- units × avg price
- Conversion rate
- 1.6%
- Avg BSR
- #201
- Page quality
- 0%
- Prime
- 97%
- Sponsored
- 42%
- Out of stock
- 20.1%
- Avg brand age
- 15 months
- Avg seller age
- 198 days
Competition & brand share
The top 5 products take 40% of clicks — established leaders, but buyers still shop beyond them.Brands
11 rising
Sellers
34
Top-5 brand share
84%
Top 20: 100%
Top-5 click share
40%
Top 20: 83%
Open market
12%
- Rubies38%
- Tangsenyu18%
- Atorcher18%
- Kitimi7%
- shyhand4%
- Metaparty4%
- Open — no brand owns it (5 brands, 12%)
Demand
Weekly Amazon search volume, last 45 weeks — -56.4% search growth over the last 90 days.Top rumi costume search terms
- rumi costume kids834K/yr
- rumi costume364K/yr
- kpop demon hunters costume rumi63K/yr
- rumi kpop demon hunters costume78K/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
Rubies Official Netflix K-Pop Demon Hunters Deluxe Rumi Golden Child Costume Kids Fancy Dress Size Age 7-8 Years
Rubies£21.064.2★304 rev
Atorcher Girls Halloween Costume Black and Yellow Polyester Top and Pants Set for Cosplay Events and Parties
Atorcher£21.174.1★39 rev
Tangsenyu Kids Rumi Costume for Girls Halloween Outfit Include Jacket T-shirt and Shorts
Tangsenyu£31.744.1★96 rev
Rubies Official Netflix K-Pop Demon Hunters Rumi Child Costume Kids Fancy Dress Size Age 7-8 Years
Rubies£20.223.9★91 rev
Rubies Official Netflix K-Pop Demon Hunters Deluxe Rumi Golden Child Costume Kids Fancy Dress Size Age 6+ Years
Rubies£21.234.2★304 rev
Newest
by launch date
shyhand 3PCS Girls Anime Costume Kids Anime Cosplay Halloween Outfit for Fancy Party Carnival Theme Dress Up (XLarge-140cm)
shyhand£24.872 rev
Luchild Kids Cosplay Costume Girls Dress Up Stage Outfits with Top Coat Pants 74Pcs Stickers Kids Pop Cosplay Themed Costumes Halloween Carnival Masquerade Dress Up Party for Little Girls
Luchild£22.220 rev
Metaparty Pop Costumes World Book Day Costumes with Top Jacket Shorts for World Book Day (Black 130)
Metaparty£17.822 rev
K-p0p D-Dem0n H-Hunters Costume Kids Girls Ani-me H-Hunters Outfits Pop Singers Coat Top Shorts Dance Stage Role Play Outfit Shorts & T-Shirt Christmas Carnival Dress Up Party Cosplay (Orange 130)
JIASHA£18.7614 rev
nezafly Anime Cosplay Costume Kids Girls Black Stage Outfits Set Halloween
nezafly£28.6417 rev
Trending
90-day click momentumshyhand 3PCS Girls Anime Costume Kids Anime Cosplay Halloween Outfit for Fancy Party Carnival Theme Dress Up (XLarge-140cm)
shyhand£24.874.5★
Luchild Kids Cosplay Costume Girls Dress Up Stage Outfits with Top Coat Pants 74Pcs Stickers Kids Pop Cosplay Themed Costumes Halloween Carnival Masquerade Dress Up Party for Little Girls
Luchild£22.220.0★
Rubies Official Netflix K-Pop Demon Hunters Deluxe Rumi Golden Child Costume Kids Fancy Dress Size Age 11-13 Years
Rubies£21.174.2★
K-p0p D-Dem0n H-Hunters Costume Kids Girls Ani-me H-Hunters Outfits Pop Singers Coat Top Shorts Dance Stage Role Play Outfit Shorts & T-Shirt Christmas Carnival Dress Up Party Cosplay (Orange 130)
JIASHA£18.764.4★
Rubies Official Netflix K-Pop Demon Hunters Deluxe Rumi Golden Child Costume Kids Fancy Dress Size Age 6+ Years
Rubies£21.234.2★
What buyers say about rumi costume
What buyers praise and complain about, mined from review topics.What buyers love
“Overall it is a well made”
“fits as shown in the size chart”
“Good value”
“Present”
“Better than I expected”
“is very comfortable”
“Its made from a comfortable material that allows for plenty of movement”
“Great color”
“has already had plenty of use”
“A good product for rumi hair”
What buyers complain about
“It doesn't fit or look right”
“Way over priced”
“Very poor quality control”
“Very cheap material”
“It's not overally thick”
“Its pulled a huge clump of my daughters hair”
“Broken already 2 days in”
“the attachments all broke on the first wear”
“Doesnt look anything like the pictures”
“Grips are so small the dont stay in hair”
Top return reasons
Common questions
- Is rumi costume profitable to sell on Amazon United Kingdom?
- The niche generates £483K/yr across 33 tracked products. 13 of 33 products launched in the last 360 days are still selling. 90-day search growth is -56.4%. Flapen's verdict: Worth a look (54/100).
- How competitive is the rumi costume niche?
- 11 brands and 34 sellers compete. The top 5 products take 40% of clicks and top 5 brands hold 84% of demand.
- What do buyers complain about in rumi costume?
- Top complaints mined from reviews: Size-Overall, Value For Money, Quality-Overall. The return rate is 2.3%.
- What does it cost to enter the rumi costume niche?
- Listings span £10.60–£31.74; the average listing price is £22.95 (sweet spot $15–$100). The average incumbent carries 118 reviews — the moat a new listing must climb.