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26

blue ninja costume kids

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A small market ($0/yr) — this niche doesn't clear our bar today.

Market size 0Growth 31Conversion 0Competition 28Returns 26Price range 88Avg price 95Brand share 7Review moat 43Quality gap 24

Avg price

Incredible$26.69

avg listing price — sweet spot $15–$100

Price range

Great$13.28–$33.72

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

Review moat

Okay2,166.08

avg incumbent reviews — the moat a new listing must climb

Growth

Okay+4.9%

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

Competition

Okay68%

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

Returns

Okay5.8%

return rate — above 6% kills the launch gate

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

Brand share

Bad97%

top-5 brand share — brand-locked demand

Market size

Bad$0

$0/yr · 32K searches

Conversion

Bad0.0%

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

Competition

The top 5 products take 68% of clicks — established leaders, but buyers still shop beyond them.

Brands

6 flat

Sellers

8

Top-5 brand share

97%

Open market

0%

  • Spooktacular Creations32%
  • Fun Costumes29%
  • SATKULL18%
  • Bosvin10%
  • Missanabie8%
  • Runcati3%

Product shelf

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

0%10%$020%$030%$040%$01101001K10K100K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 12 tracked products in this niche — three views at once, no toggling.

Demand & seasonality

Weekly Amazon search volume, last 84 weeks — +4.9% search growth over the last 90 days.
5K3KSpike '25Prime Day '25Spike '26DecJanFebMarAprMayJunJulAugSepOctNovDecJanFebMarAprMayJun

Peak months: Sep, Oct, Nov · busiest ÷ quietest = 35.5×

Reviews

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

What buyers love

Value For Money25%

“The value for the price seems good”

Quality-Overall16%

“Really fantastic quality”

Size-Overall10%

“Great price and accurate size description”

Washability6%

“Has survived many washes”

Color6%

“The color is accurate to the photos”

Material Quality4%

“The material feels better than expected”

Gifting Purpose3%

“it was his favorite present”

Adjustability/Rotatability/Reclining3%

“easy to adjust”

Warmth2%

“the nicer fabric makes it warmer”

Advertised Vs Actual Product2%

“Better than it should be”

What buyers complain about

Thickness17%

“not like the super thin costume material some of these come with”

Size-Overall9%

“The only downsides for me are the fit”

Material Quality5%

“The material is kind of thin so probably won't hold up to too much wear and tear”

Arm Fit4%

“The arm holes are also pretty tight”

Weight Heavy4%

“heavier than I expected”

Top return reasons

Size-Overall65%
Material Quality8%
Color7%
Smell3%
Product Condition3%
Defective Material/Parts2%
Sleeve Fit2%
Thin2%
Comfort-Overall2%
Chest Fit2%