ninja costume
Skip itWeak search conversion (1.4%) — this niche doesn't clear our bar today.
Avg price
Incredible$31.29avg listing price — sweet spot $15–$100
Price range
Great$13.28–$58.11cheapest 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
Okay2,714.55avg incumbent reviews — the moat a new listing must climb
Returns
Bad6.6%return rate — above 6% kills the launch gate
Growth
Bad-11.3%90-day search growth — must beat 0% to launch
Conversion
Bad1.4%search→purchase rate — share of searches ending in a sale
Competition
The top 5 products take 49% of clicks — established leaders, but buyers still shop beyond them.Brands
14 falling
Sellers
32
Top-5 brand share
81%
Open market
15%
- Spooktacular Creations46%
- GRACEART16%
- Bosvin10%
- California Costumes5%
- Missanabie4%
- SATKULL4%
- Open — no brand owns it (8 brands, 15%)
Product shelf
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 31 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
California Costumes Boys Ninja-X Scorpion Strike Size M
California Costumes$38.583 rev
Mens Black Ninja Costume Japanese Samurai Swordsman Uniform Suit Halloween Cosplay Outfit
GRACEART$39.6316 rev
Mens Black Ninja Costume Japanese Samurai Swordsman Uniform Suit Halloween Cosplay Outfit
GRACEART$39.2916 rev
TOKYO REVENGERS Men Medieval Renaissance Pirate Costume Knight Cosplay Outfit LARP Costume Accessories Set (BK 2XL)
TOKYO REVENGERS$35.6367 rev
Trending
90-day click momentum
Elite Sports IBJJF Ultra Light BJJ Brazilian Jiu Jitsu Gi for Kids with Preshrunk Fabric and Free Belt (Green 1)
Elite Sports$44.224.8★
ReliBeauty Green Ninja Kids Costume for Boys suit with Deluxe Ninja Accessories 120
ReliBeauty$38.034.6★
Elite Sports Bjj Gi for Men - Brazilian Jiu Jitsu Gi - Preshrunk sweat wicking Fabric - Machine washable - Free white Belt
Elite Sports$58.114.7★
Mens Black Ninja Costume Japanese Samurai Swordsman Uniform Suit Halloween Cosplay Outfit
GRACEART$39.634.3★
Mens Black Ninja Costume Japanese Samurai Swordsman Uniform Suit Halloween Cosplay Outfit
GRACEART$39.294.3★
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×
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“Accessories good quality”
“Gi length is perfect”
“They are very comfortable”
“The gi feels durable and well-made, especially after multiple training sessions and washes”
“Great Value”
“great material”
“a lot lighter than I anticipated”
“I love the color”
“It was easy to move around”
“Fun Costume That Immediately Gets Kids Into Character”
What buyers complain about
“Fit was a bit large”
“supposedly brand new”
“Sun didnt like the fabric”
“Priced for a reason”
“Itchy and cheap”
“way to hard to put on not worth it”
“QUALITY CONTROL needs to be involved”
“It is thin material”
“Not good durability”
“came with a hole in the right pocket”