Is ninja costume profitable to sell on Amazon United States?

The niche generates $431K/yr across 31 tracked products. 0 of 2 products launched in the last 360 days are still selling. 90-day search growth is -11.3%. Flapen's verdict: Skip it (43/100).

How competitive is the ninja costume niche?

14 brands and 32 sellers compete. The top 5 products take 49% of clicks and top 5 brands hold 81% of demand.

What do buyers complain about in ninja costume?

Top complaints mined from reviews: Size-Overall, Product Condition, Material Quality. The return rate is 6.6% — above our launch gate.

When does demand for ninja costume peak?

Demand peaks in Sep–Oct; the busiest month runs 26.2× the quietest.

What does it cost to enter the ninja costume niche?

Listings span $13.28–$58.11; the average listing price is $31.29 (sweet spot $15–$100). The average incumbent carries 2,715 reviews — the moat a new listing must climb.

ninja costume

Skip it

Weak search conversion (1.4%) — this niche doesn't clear our bar today.

Avg price

Incredible$31.29

avg listing price — sweet spot $15–$100

Price range

Great$13.28–$58.11

cheapest to priciest tracked listing — scored on the share inside $15–$100

Competition

Good49%

top-5 click share — leaders hold, buyers still browse

Market size

Good$431K

$431K/yr · 1.0M searches

Brand share

Okay81%

top-5 brand share — brands hold most of the demand

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Review moat

Okay2,714.55

avg incumbent reviews — the moat a new listing must climb

Growth

Bad-11.3%

90-day search growth — must beat 0% to launch

Returns

Bad6.6%

return rate — above 5% kills the launch gate

Conversion

Bad1.4%

search→purchase rate — share of searches ending in a sale

Signals High Returns

According to Flapen's Amazon United States niche tracking, ninja costume is a $431K/yr Amazon United States market (1.0M searches/yr). The top 5 brands hold 81% of demand. Demand peaks in Sep–Oct. Verdict: Skip it — 43/100.

Data updated Jul 10, 2026 · scored weekly · How we score niches

ninja costume market data

Units sold / yr: 13K–15K; avg 250–500/product
Revenue / yr: $391K–$469K; units × avg price
Conversion rate: 1.4%
Avg BSR: #1,018
Page quality: 0%
Prime: 100%
Sponsored: 81%
Out of stock: 9.3%
Avg brand age: 51 months
Avg seller age: 171 days

Competition & brand share

The top 5 products take 49% of clicks — established leaders, but buyers still shop beyond them.

Brands

14 falling

Sellers

Top-5 brand share

81%

Top 20: 100%

Top-5 click share

49%

Top 20: 87%

Open market

15%

Spooktacular Creations46%
GRACEART16%
Bosvin10%
California Costumes5%
Missanabie4%
SATKULL4%
Open — no brand owns it (8 brands, 15%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -11.3% search growth over the last 90 days.

Peak months: Sep, Oct · busiest ÷ quietest = 26.2×

Open Trend

Top ninja costume search terms

ninja costume359K/yr -9.5%0.6% conv.
ninja costume kids270K/yr -39.2%1.2% conv.
ninja costume kids 6-853K/yr -3.5%2.6% conv.
kids ninja costume65K/yr +2.3%1.6% conv.
ninja outfit21K/yr +15.2%0.3% conv.
ninja suit17K/yr -8.9%0.2% conv.
ninja costumes29K/yr -4.6%0.2% conv.
ninja costume 4-6 years4K/yr +147.1%2.4% conv.
ninja suit for kids7K/yr +1.8%1.4% conv.
ninja outfit kids4K/yr +52.9%1.5% conv.

All search terms

Top ninja 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.

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

Spooktacular Creations Halloween Ninja Costume Black Ninja Outfit Set for Kids Halloween Costumes with Accessories for Boys Dress Up and Role Play Party (Small 5-7 yrs)

Spooktacular Creations$28.574.7★10,729 rev

Mens Black Ninja Costume Japanese Samurai Swordsman Uniform Suit Halloween Cosplay Outfit

GRACEART$39.634.3★16 rev

Spooktacular Creations Halloween Ninja Costume Kids Black Red Ninja Dragon Jumpsuit Set Boys Halloween Costume for DressUp and RolePlay Party (Small 5-7 yrs)

Spooktacular Creations$31.204.6★4,066 rev

Spooktacular Creations Golden Ninja Costume Set Ninja Jumpsuit with Foam Accessories for Kids Toddler Halloween Outfit for Ideas Cosplay Party (Small 5-7 yrs)

Spooktacular Creations$32.664.6★1,377 rev

Ninjia Costume for Boys & Girls - Kids Ninja Costume Suit with Deluxe Ninja Toys for Halloween Cospaly Role Playing (Gold & Black) 6-7 Years

Bosvin$33.144.6★280 rev

Newest

by launch date

ReliBeauty Green Ninja Kids Costume for Boys suit with Deluxe Ninja Accessories 120

ReliBeauty$38.039 rev

5mo ago

California Costumes Boys Ninja-X Scorpion Strike Size M

California Costumes$38.583 rev

11mo ago

Mens Black Ninja Costume Japanese Samurai Swordsman Uniform Suit Halloween Cosplay Outfit

GRACEART$39.6316 rev

1y ago

Mens Black Ninja Costume Japanese Samurai Swordsman Uniform Suit Halloween Cosplay Outfit

GRACEART$39.2916 rev

1y ago

TOKYO REVENGERS Men Medieval Renaissance Pirate Costume Knight Cosplay Outfit LARP Costume Accessories Set (BK 2XL)

TOKYO REVENGERS$35.6367 rev

1y ago

What buyers say about ninja costume

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

What buyers love

Quality-Overall19%

“Accessories good quality”

Size-Overall18%

“Gi length is perfect”

Comfort-Overall15%

“They are very comfortable”

Durability7%

“The gi feels durable and well-made, especially after multiple training sessions and washes”

Value For Money6%

“Great Value”

Material Quality5%

“great material”

Weight Light4%

“a lot lighter than I anticipated”

Color3%

“I love the color”

Ease Of Use2%

“It was easy to move around”

Fun/Entertainment Experience2%

“Fun Costume That Immediately Gets Kids Into Character”

What buyers complain about

Size-Overall10%

“Fit was a bit large”

Product Condition8%

“supposedly brand new”

Material Quality8%

“Sun didnt like the fabric”

Value For Money5%

“Priced for a reason”

Allergies5%

“Itchy and cheap”

Ease Of Use5%

“way to hard to put on not worth it”

Quality-Overall4%

“QUALITY CONTROL needs to be involved”

Thickness3%

“It is thin material”

Durability3%

“Not good durability”

Pockets/Compartments3%

“came with a hole in the right pocket”

Top return reasons

Size-Overall63%

Advertised Vs Actual Product5%

Material Quality5%

Quality-Overall4%

Color4%

Length3%

Product Condition2%

Value For Money1%

Waist Fit1%

Defective Material/Parts1%

Common questions

Is ninja costume profitable to sell on Amazon United States?: The niche generates $431K/yr across 31 tracked products. 0 of 2 products launched in the last 360 days are still selling. 90-day search growth is -11.3%. Flapen's verdict: Skip it (43/100).
How competitive is the ninja costume niche?: 14 brands and 32 sellers compete. The top 5 products take 49% of clicks and top 5 brands hold 81% of demand.
What do buyers complain about in ninja costume?: Top complaints mined from reviews: Size-Overall, Product Condition, Material Quality. The return rate is 6.6% — above our launch gate.
When does demand for ninja costume peak?: Demand peaks in Sep–Oct; the busiest month runs 26.2× the quietest.
What does it cost to enter the ninja costume niche?: Listings span $13.28–$58.11; the average listing price is $31.29 (sweet spot $15–$100). The average incumbent carries 2,715 reviews — the moat a new listing must climb.

ninja costume

ninja costume market data

Competition & brand share

Demand & seasonality

Top ninja costume search terms

Top ninja costume products on Amazon

Top sellers

Newest

Trending

What buyers say about ninja costume

What buyers love

What buyers complain about

Top return reasons

Common questions

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