Is rengoku profitable to sell on Amazon United States?

The niche generates $127K/yr across 14 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -15.1%. Flapen's verdict: Skip it (39/100).

How competitive is the rengoku niche?

10 brands and 138 sellers compete. The top 5 products take 72% of clicks and top 5 brands hold 83% of demand.

What do buyers complain about in rengoku?

Top complaints mined from reviews: Quality-Overall, Balance/Stability, Durability. The return rate is 1.2%.

When does demand for rengoku peak?

Demand peaks in Aug–Sep–Nov–Dec; the busiest month runs 4.1× the quietest.

What does it cost to enter the rengoku niche?

Listings span $10.03–$122.84; the average listing price is $33.57 (sweet spot $15–$100). The average incumbent carries 527 reviews — the moat a new listing must climb.

rengoku

Skip it

Weak search conversion (0.9%) — this niche doesn't clear our bar today.

Avg price

Incredible$33.57

avg listing price — sweet spot $15–$100

Returns

Great1.2%

return rate — above 5% kills the launch gate

Price range

Great$10.03–$122.84

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

Review moat

Good527.43

avg incumbent reviews — the moat a new listing must climb

Brand share

Okay83%

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

Market size

Okay$127K

$127K/yr · 417K searches

Competition

Bad72%

top-5 click share — a locked-up shelf

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Growth

Bad-15.1%

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

Conversion

Bad0.9%

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

Signals Low Review Barrier

According to Flapen's Amazon United States niche tracking, rengoku is a $127K/yr Amazon United States market (417K searches/yr). The top 5 brands hold 83% of demand. Demand peaks in Aug–Sep–Nov–Dec. Verdict: Skip it — 39/100.

Data updated Jul 17, 2026 · scored weekly · How we score niches

rengoku market data

Units sold / yr: 5K–6K; avg 100–250/product
Revenue / yr: $168K–$201K; units × avg price
Conversion rate: 0.9%
Avg BSR: #4,245
Page quality: 0%
Prime: 79%
Sponsored: 14%
Out of stock: 10.8%
Avg brand age: 34 months
Avg seller age: 155 days

Competition & brand share

The top 5 products capture 72% of clicks — a locked-up shelf that new listings rarely crack.

Brands

10 falling

Sellers

138

Top-5 brand share

83%

Top 20: 100%

Top-5 click share

72%

Top 20: 100%

Open market

12%

Juejuezi40%
Funko16%
Banpresto11%
Ultimate Legends11%
SEGA5%
SONGCHANGJEWELRY5%
Open — no brand owns it (4 brands, 12%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -15.1% search growth over the last 90 days.

Peak months: Aug, Sep, Nov, Dec · busiest ÷ quietest = 4.1×

Open Trend

Top rengoku search terms

rengoku196K/yr -13.3%0.5% conv.
rengoku figure89K/yr -13.9%0.5% conv.
rengoku funko pop37K/yr -18.1%1.1% conv.
demon slayer rengoku34K/yr -24.1%0.6% conv.
kyojuro rengoku19K/yr -5.7%0.4% conv.
rengoku merch12K/yr -25.0%0.5% conv.
rengoku action figure9K/yr -9.8%0.6% conv.
demon slayer funko pop rengoku4K/yr +11.8%0.5% conv.
funko rengoku3K/yr -28.9%0.4% conv.
rengoku funko5K/yr -16.0%1.8% conv.

All search terms

Top rengoku 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 14 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Hooded Wearable Blanket Hoodie Throw Blanket Cloak Cosplay Costume Shawl Wrap Nap Quilt 160x100 cm/63x40in(White One Size)

Juejuezi$28.554.6★339 rev

Ultimate Legends - Demon Slayer - Kyojuro Rengoku 5 Action Figure

Ultimate Legends$18.624.6★662 rev

Funko Pop! Animation: Demon Slayer - Rengoku - Sumi-Ink - Collectable Vinyl Figure - Gift Idea - Official Merchandise - Toys for Kids & Adults - Anime Fans - Model Figure for Collectors

Funko$15.674.5★29 rev

Funko POP! Animation: Demon Slayer - Kyojuro Rengoku - Collectable Vinyl Figure - Gift Idea - Official Merchandise - for Kids & Adults - Anime Fans - Model Figure for Collectors and Display

Funko$21.014.9★2,344 rev

SEGA - Demon Slayer: Kimetsu no Yaiba PM Perching Figure Kyojuro Rengoku

SEGA$37.964.9★1,149 rev

Newest

by launch date

Funko Pop! Animation: Demon Slayer - Rengoku - Sumi-Ink - Collectable Vinyl Figure - Gift Idea - Official Merchandise - Toys for Kids & Adults - Anime Fans - Model Figure for Collectors

Funko$15.6729 rev

7mo ago

Demon Slayer Kimetsu No Yaiba Rengoku Flame Hashira Anime Tumbler 30 Oz

Team Liquid$35.05468 rev

12mo ago

Banpresto - Demon Slayer: Kimetsu no Yaiba - Kyojuro Rengoku Maximatic Figure

Banpresto$34.2620 rev

1y ago

Adult Anime Cosplay Costume Kimono Cape Cardigan Top

IOONCHI$23.54107 rev

1y ago

Ultimate Legends - Demon Slayer - Kyojuro Rengoku 5 Action Figure

Ultimate Legends$18.62662 rev

2y ago

What buyers say about rengoku

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

What buyers love

Fun/Entertainment Experience14%

“Il adore jouer avec”

Quality-Overall14%

“Great details, price is very reasonable for the size and doesnt break easily”

Value For Money12%

“Hes also decently hefty for a budget figurine”

Comfort-Overall10%

“Comfy”

Ease Of Cleaning9%

“Very easy to clean”

Gifting Purpose9%

“Loved this gift”

Collectibles7%

“Good details just veryyyy small regular q poskets are bigger this on is the petite collection I didnt realize that when I bought it”

Assembly/Installation7%

“It was really easy to put together and good quality”

Design-Overall4%

“looks is very good”

Advertised Vs Actual Product2%

“Just as advertised”

What buyers complain about

Quality-Overall27%

“Poor quality”

Balance/Stability20%

“doesnt look stable at all”

Durability17%

“right fist broke within first 5 minutes”

Strength10%

“This figure is very delicate”

Display-Overall10%

“This figure is very delicate and is strictly for display, not playing with”

Machine Wash Suitability7%

“It fell apart with two washes”

Top return reasons

Size-Overall23%

Defective Material/Parts21%

Value For Money8%

Durability8%

Advertised Vs Actual Product6%

Quality-Overall5%

Product Condition5%

Shape/Style4%

Hard Feel3%

Strength3%

Common questions

Is rengoku profitable to sell on Amazon United States?: The niche generates $127K/yr across 14 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -15.1%. Flapen's verdict: Skip it (39/100).
How competitive is the rengoku niche?: 10 brands and 138 sellers compete. The top 5 products take 72% of clicks and top 5 brands hold 83% of demand.
What do buyers complain about in rengoku?: Top complaints mined from reviews: Quality-Overall, Balance/Stability, Durability. The return rate is 1.2%.
When does demand for rengoku peak?: Demand peaks in Aug–Sep–Nov–Dec; the busiest month runs 4.1× the quietest.
What does it cost to enter the rengoku niche?: Listings span $10.03–$122.84; the average listing price is $33.57 (sweet spot $15–$100). The average incumbent carries 527 reviews — the moat a new listing must climb.