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39

harry potter costume accessories

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A small market ($20K/yr) — this niche doesn't clear our bar today.

Market size 5Growth 11Conversion 33Competition 72Returns 32Price range 71Avg price 83Brand share 67Review moat 53Quality gap 24

Avg price

Great$18.06

avg listing price — sweet spot $15–$100

Competition

Good42%

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

Price range

Good$5.22–$38.78

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

Brand share

Good65%

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

Review moat

Good1,377.41

avg incumbent reviews — the moat a new listing must climb

Conversion

Okay2.6%

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

Returns

Okay5.2%

return rate — above 6% kills the launch gate

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

Growth

Bad-27.9%

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

Market size

Bad$20K

$20K/yr · 42K searches

Competition

The top 5 products take 42% of clicks — established leaders, but buyers still shop beyond them.

Brands

19 rising

Sellers

71

Top-5 brand share

65%

Open market

30%

  • Harry Potter25%
  • Disguise13%
  • MISS FANTASY12%
  • TINVSKQQKJ7%
  • QAQ-COSPLAY7%
  • Mzjeaziany5%

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%4%$7928%$2K12%$2K16%$3K1101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 29 tracked products in this niche — three views at once, no toggling.

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -27.9% search growth over the last 90 days.
7K5KPrime Day '24Spike '24Spike '25Prime Day '25Spike '26SepDecMarJunAugNovMarMay

Peak months: Sep, Oct, Nov · busiest ÷ quietest = 30.2×

Reviews

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

What buyers love

Quality-Overall22%

“Great quality for Harry Potter world”

Size-Overall10%

“Great fit”

Gifting Purpose7%

“Cute gift”

Fun/Entertainment Experience7%

“lots of fun”

Value For Money7%

“Worth every cent”

Advertised Vs Actual Product6%

“Exactly as described”

Soft Feel5%

“The material is soft”

Strength4%

“Very sturdy”

Material Quality4%

“comfortable fabric that looks authentic”

Design-Overall3%

“Design on the bag is cool”

What buyers complain about

Size-Overall26%

“the hat is a bit small”

Quality-Overall16%

“buy a better quality costume from the get go”

Durability11%

“Came apart multiple times ongoing”

Material Quality7%

“Unfortunately it just felt and looked cheap”

Length4%

“super extra long”

Allergies4%

“She is allergic to a lot of earrings”

Advertised Vs Actual Product3%

“Misleading”

Comfort-Overall2%

“Uncomfortable”

Stitch/Finish/Polish2%

“The stitching looks rushed and low quality, which makes the costume look worn before even being used”

Value For Money1%

“Not worth the money”

Top return reasons

Size-Overall45%
Quality-Overall8%
Value For Money7%
Advertised Vs Actual Product5%
Material Quality5%
Length4%
Color4%
Defective Material/Parts3%
Functionality-Overall2%
Product Condition2%