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.

Rumi Costume

Worth a look

Shows a sweet-spot price point ($22.95 avg), but soft demand (-56.4% this quarter) keeps it on the watch list.

Avg price

Incredible£22.95

avg listing price — sweet spot $15–$100

Review moat

Great118.42

avg 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–£31.74

cheapest 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

Is rumi costume profitable on Amazon?

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 size & sales

Units sold, revenue, conversion and listing quality across the tracked shelf.

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: brands, sellers & click share

The top 5 products take 40% of clicks — established leaders, but buyers still shop beyond them.

Brands

11 rising

Sellers

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%)

rumi costume demand & seasonality

Weekly Amazon search volume, last 45 weeks — -56.4% search growth over the last 90 days.

Open Trend

Top rumi costume search terms shoppers use

The exact queries shoppers type, with yearly volume, growth and conversion.

rumi costume kids834K/yr -56.2%1.4% conv.
rumi costume364K/yr -50.2%0.8% conv.
kpop demon hunters costume rumi63K/yr -69.8%1.1% conv.
rumi kpop demon hunters costume78K/yr -76.5%0.8% conv.

All search terms

Top rumi costume products & what they sell for

Every tracked product — its share of the shelf, its review moat, and what it sells for.

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted

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

2mo ago

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

3mo ago

Metaparty Pop Costumes World Book Day Costumes with Top Jacket Shorts for World Book Day (Black 130)

Metaparty£17.822 rev

4mo ago

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

5mo ago

nezafly Anime Cosplay Costume Kids Girls Black Stage Outfits Set Halloween

nezafly£28.6417 rev

5mo ago

What reviews say buyers love and hate about rumi costume

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall23%

“Overall it is a well made”

Size-Overall21%

“fits as shown in the size chart”

Value For Money8%

“Good value”

Gifting Purpose6%

“Present”

Advertised Vs Actual Product6%

“Better than I expected”

Comfort-Overall4%

“is very comfortable”

Material Quality3%

“Its made from a comfortable material that allows for plenty of movement”

Color3%

“Great color”

Ease Of Use3%

“has already had plenty of use”

Hair Styling3%

“A good product for rumi hair”

What buyers complain about

Size-Overall25%

“It doesn't fit or look right”

Value For Money20%

“Way over priced”

Quality-Overall16%

“Very poor quality control”

Material Quality8%

“Very cheap material”

Thickness4%

“It's not overally thick”

Suitability Long Hair4%

“Its pulled a huge clump of my daughters hair”

Durability3%

“Broken already 2 days in”

Add-Ons/Attachments3%

“the attachments all broke on the first wear”

Advertised Vs Actual Product2%

“Doesnt look anything like the pictures”

Grip2%

“Grips are so small the dont stay in hair”

Top return reasons

Size-Overall72%

Quality-Overall14%

Material Quality3%

Advertised Vs Actual Product2%

Suitability Short Hair1%

Value For Money1%

Weight Heavy1%

Defective Material/Parts1%

Stitch/Finish/Polish1%

Thin1%

Common rumi costume 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.

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