---
title: "Hollow Knight Costume — $3K/mo Amazon US Product Research"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/hollow-knight-costume"
last_updated: "2026-08-12T22:36:56.854Z"
locale: en
meta:
description: "Amazon product research for hollow knight costume: $3K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for hollow knight costume: $3K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "Hollow Knight Costume — $3K/mo Amazon US Product Research"
---
# **Hollow Knight Costume**
**Skip it**
Weak search conversion (0.3%) — this niche doesn't clear our bar today.
Market size 9Growth 13Conversion 4Competition 43Returns 47Price range 64Avg price 95Brand share 38Review moat 97Quality gap 50
**Review moat**
**Incredible****67.75**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Incredible****$36.03**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$12.65–$144.49**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Quality gap**
**Good****4.5★**
avg incumbent rating — lower means beatable quality
**Returns**
**Okay****3.2%**
return rate — above 5% kills the launch gate
**Competition**
**Okay****59%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Okay****82%**
top-5 brand share — brands hold most of the demand
**Growth**
**Bad****-23.2%**
90-day search growth — must beat 0% to launch
**Market size**
**Bad****$34K**
$34K/yr · 318K searches
**Conversion**
**Bad****0.3%**
search→purchase rate — share of searches ending in a sale
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500")
## **Is hollow knight costume profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, hollow knight costume is a $34K/yr Amazon United States market (318K searches/yr). The top 5 brands hold 82% of demand. Demand peaks in Sep–Oct–Nov. Verdict: Skip it — 36/100.
Data updated Jul 17, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **hollow knight costume market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **5K–6K**
- avg 250–500/product
- **Revenue / yr**
- **$180K–$216K**
- units × avg price
- **Conversion rate**
- **0.3%**
- **Avg BSR**
- **#1,933**
- **Page quality**
- **0%**
- **Prime**
- **80%**
- **Sponsored**
- **60%**
- **Out of stock**
- **25.8%**
- **Avg brand age**
- **40 months**
- **Avg seller age**
- **201 days**
## **Competition: brands, sellers & click share**
The top 5 products take 59% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**13 **▲rising
**Sellers**
**15**
**Top-5 brand share**
**82%**
Top 20: 100%
**Top-5 click share**
**59%**
Top 20: 100%
**Open market**
**14%**
- Lanmachoice38% - Colorful House15% - C-ZOFEK14% - NDJLNZ11% - Generic5% - UQJE4% - Open — no brand owns it (7 brands, 14%)
## **hollow knight costume demand & seasonality**
Weekly Amazon search volume, last 90 weeks — -23.2% search growth over the last 90 days.
50K30KSpike '25Prime Day '25 seasonNovDecJanFebMarAprMayJunJulAugSepOctNovDecJanFebMarAprMayJun
Peak months: Sep, Oct, Nov · busiest ÷ quietest = 81.9×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/hollow-knight-costume/trend)
## **Top hollow knight costume search terms shoppers use**
The exact queries shoppers type, with yearly volume, growth and conversion.
- **hollow knight costume**150K/yr-23.9%0.8% conv. - **hollow knight mask**75K/yr-27.5%0.7% conv. - **hollow knight cosplay**24K/yr-14.0%0.4% conv. - **hollow knight hollow knight halloween cosplay costume**43K/yr-30.6%0.3% conv. - **hollow knight helmet**7K/yr-15.8%0.5% conv. - **hollow knight costume kids**11K/yr-19.3%0.0% conv. - **hollow knight costumes**3K/yr-2.7%0.0% conv. - **hollow knight halloween costume**5K/yr+27.7%0.0% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/hollow-knight-costume/search-terms)
## **Top hollow knight costume products & what they sell for**
Every tracked product — its share of the shelf, its review moat, and what it sells for.
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%5%$2K10%$3K15%$5K20%$7K1101001K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 20 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Lanmachoice White Knight Mask with Round Horns Cosplay Costume pvc Mask for Halloween & Game-Inspired Looks**Lanmachoice**$24.32**4.8★230 rev](https://www.amazon.com/dp/B0FFGHMNFR) [2**Colorful House Adult Renaissance Cloak Gothic Witch Cape with Hooded Medieval Halloween Capes(Blue 39)**Colorful House**$18.02**4.5★195 rev](https://www.amazon.com/dp/B0BCW65H1Z) [3**NDJLNZ Knight Mask Funny Halloween Cosplay Costume Accessories Game Party Character Mask Full Head Latex**NDJLNZ**$32.14**4.4★46 rev](https://www.amazon.com/dp/B0D235LP6C) [4**Lanmachoice 3 PCS Knight Mask with Prop Sword and Black Cloak Halloween Costume Cosplay Outfit Set for Adults Costume Accessory for Party Dress Up**Lanmachoice**$26.36**5.0★1 rev](https://www.amazon.com/dp/B0GVD7MYF9) [5**C-ZOFEK Adventure Game Hooded Cape Cloak Gothic Cosplay Costume (Navy Blue)**C-ZOFEK**$45.66**4.7★13 rev](https://www.amazon.com/dp/B0CDVY214V)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Lanmachoice 3 PCS Knight Mask with Prop Sword and Black Cloak Halloween Costume Cosplay Outfit Set for Adults Costume Accessory for Party Dress Up**Lanmachoice**$26.36**1 rev3mo ago](https://www.amazon.com/dp/B0GVD7MYF9) [**Lanmachoice 3 PCS Knight Mask with Needle Prop Sword and Red Satin Cloak Halloween Costume Cosplay Outfit Set for Adults Costume Accessory for Party Dress Up Hornets Style**Lanmachoice**$24.65**1 rev3mo ago](https://www.amazon.com/dp/B0GTZ23W42) [**miccostumes Womens Costume Knight Cosplay Cape with Mask (red l/xl)**miccostumes**$59.70**1 rev4mo ago](https://www.amazon.com/dp/B0GSV9XJGQ) [**20.8 Knight Sword Cosplay Halloween Costume Accessory for Party Stage Performance Photo Prop Silver**Lanmachoice**$12.65**25 rev6mo ago](https://www.amazon.com/dp/B0GF7WV9KB) [**CoserWorld Knight Sword for Halloween Cosplay Costume Accessories LARP Props Silver**CoserWorld**$19.31**11 rev7mo ago](https://www.amazon.com/dp/B0G3T1VH4K)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**miccostumes Womens Costume Knight Cosplay Cape with Mask (red l/xl)**miccostumes**$59.70**5.0★**▲ 1000%**](https://www.amazon.com/dp/B0GSV9XJGQ) [**Lanmachoice 3 PCS Knight Mask with Prop Sword and Black Cloak Halloween Costume Cosplay Outfit Set for Adults Costume Accessory for Party Dress Up**Lanmachoice**$26.36**5.0★**▲ 1000%**](https://www.amazon.com/dp/B0GVD7MYF9) [**Lanmachoice 3 PCS Knight Mask with Needle Prop Sword and Red Satin Cloak Halloween Costume Cosplay Outfit Set for Adults Costume Accessory for Party Dress Up Hornets Style**Lanmachoice**$24.65**3.0★**▲ 1000%**](https://www.amazon.com/dp/B0GTZ23W42) [**JEMITOP Mens Retro Renaissance Costume Lace Up Sleeveless Shirts for Pirate Medieval Viking Halloween Cosplay Black L**JEMITOP**$19.12**4.6★**▲ 1000%**](https://www.amazon.com/dp/B0DPPCR9LJ) [**20.8 Knight Sword Cosplay Halloween Costume Accessory for Party Stage Performance Photo Prop Silver**Lanmachoice**$12.65**4.5★**▲ 1000%**](https://www.amazon.com/dp/B0GF7WV9KB)
**~~View all trending →~~**
## **What reviews say buyers love and hate about hollow knight costume**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**19%
*“It feels extremely well made in the details are very well done and clear”*
**Durability**10%
*“it has held up”*
**Size-Overall**9%
*“a good fit”*
**Advertised Vs Actual Product**8%
*“Better than I expected”*
**Weight Light**6%
*“Lightweight Prop Sword”*
**Value For Money**5%
*“Worth it”*
**Design-Overall**5%
*“The design looks cool enough to make the bearer feel like a real adventurer”*
**Color**4%
*“The color looks nice”*
**Comfort-Overall**3%
*“comfortable”*
**Thickness**3%
*“This sword type weapon is made of thick, sturdy plastic and is a metallic silver color”*
### **What buyers complain about **
**Size-Overall**15%
*“Large”*
**Strength**7%
*“it can be a little flimsy”*
**Sharpness**6%
*“The tip is not sharp”*
**Material Quality**3%
*“it does look like cheap plastic”*
**Stitch/Finish/Polish**3%
*“There is an obvious seam around the edges”*
**Value For Money**2%
*“it's not that cheap”*
**Adhesion/Stickiness**2%
*“The mesh on the eye holes glue is very sparse”*
**Flexibility**2%
*“the tip is bending”*
**Quality-Overall**2%
*“It does look a bit cheap”*
**Thickness**2%
*“decently thick plastic”*
### **Top return reasons **
**Size-Overall**38%
**Material Quality**20%
**Length**9%
**Advertised Vs Actual Product**6%
**Chest Fit**4%
**Color**3%
**Shape/Style**3%
**Defective Material/Parts**3%
**Shoulder Fit**2%
**Sleeve Fit**2%
## **Common hollow knight costume questions**
- **Is hollow knight costume profitable to sell on Amazon United States?**
- The niche generates $34K/yr across 20 tracked products. 0 of 8 products launched in the last 360 days are still selling. 90-day search growth is -23.2%. Flapen's verdict: Skip it (36/100).
- **How competitive is the hollow knight costume niche?**
- 13 brands and 15 sellers compete. The top 5 products take 59% of clicks and top 5 brands hold 82% of demand.
- **What do buyers complain about in hollow knight costume?**
- Top complaints mined from reviews: Size-Overall, Strength, Sharpness. The return rate is 3.2%.
- **When does demand for hollow knight costume peak?**
- Demand peaks in Sep–Oct–Nov; the busiest month runs 81.9× the quietest.
- **What does it cost to enter the hollow knight costume niche?**
- Listings span $12.65–$144.49; the average listing price is $36.03 (sweet spot $15–$100). The average incumbent carries 68 reviews — the moat a new listing must climb.
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