---
title: "shark boy costume — Niche Verdict: Skip it (44/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/clothing-shoes-jewelry/shark-boy-costume"
last_updated: "2026-07-14T07:30:26.952Z"
locale: en
meta:
  description: "a small market ($0/yr) — shark boy costume doesn't clear our bar today."
  "og:description": "a small market ($0/yr) — shark boy costume doesn't clear our bar today."
  "og:title": "shark boy costume — Niche Verdict: Skip it (44/100) | Amazon United States - Flapen"
---

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# **shark boy costume**

**Skip it**

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

Market size 0Growth 39Conversion 0Competition 70Returns 11Price range 70Avg price 95Brand share 72Review moat 71Quality gap 73

**Avg price**

**Incredible****$34.40**

avg listing price — sweet spot $15–$100

**Quality gap**

**Good****4.3★**

avg incumbent rating — lower means beatable quality

**Brand share**

**Good****62%**

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

**Review moat**

**Good****671.86**

avg incumbent reviews — the moat a new listing must climb

**Competition**

**Good****43%**

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

**Price range**

**Good****$9.62–$131.79**

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

**Growth**

**Okay****+11.5%**

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

**Returns**

**Bad****9.3%**

return rate — above 6% kills the launch gate

**Market size**

**Bad****$0**

$0/yr · 192K searches

**Conversion**

**Bad****0.0%**

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

## **Competition**

The top 5 products take 43% of clicks — established leaders, but buyers still shop beyond them.

**Brands**

**23 **▲rising

**Sellers**

**28**

**Top-5 brand share**

**62%**

**Open market**

**34%**

- Fun Costumes22% - Touchat18% - Lucky2Buy8% - JUOLOET7% - inkArts6% - JCJ4%

## **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%5%$010%$015%$020%$01101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 36 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![Touchat Shark Blanket for Adult & Kids Super Soft Cozy Flannel Throw Wearable Blanket Cartoon Animals Shark Onesie Hoodie Sleeping Bag Cosplay Shark Costume Blanket Gifts for Shark Lovers (Blue M)](https://m.media-amazon.com/images/I/414TlgyPBbL.jpg)**Touchat Shark Blanket for Adult & Kids Super Soft Cozy Flannel Throw Wearable Blanket Cartoon Animals Shark Onesie Hoodie Sleeping Bag Cosplay Shark Costume Blanket Gifts for Shark Lovers (Blue M)**Touchat**$18.12**4.5★1,252 rev](https://www.amazon.com/dp/B0CC98BTQJ) [2![Lucky2Buy Womens One-Piece High Cut Superhero Cosplay Leotard Bodysuit Teddy Swimsuit Set](https://m.media-amazon.com/images/I/41+u7zEf+nL.jpg)**Lucky2Buy Womens One-Piece High Cut Superhero Cosplay Leotard Bodysuit Teddy Swimsuit Set**Lucky2Buy**$20.30**4.1★190 rev](https://www.amazon.com/dp/B0C9V84WGT) [3![Official Shark Boy and Lava Girl Toddler Gray Shark Boy Costume Boys Superhero Jumpsuit Costume](https://m.media-amazon.com/images/I/411EGsLXt4L.jpg)**Official Shark Boy and Lava Girl Toddler Gray Shark Boy Costume Boys Superhero Jumpsuit Costume**Fun Costumes**$58.06**4.5★330 rev](https://www.amazon.com/dp/B097VJSWVR) [4![JCJ Halloween Shark Costumes Stitch Onesie Pajamas for Kids Shark Sleeper Pajama Set Hooded for Boys Girls (9-10Y)](https://m.media-amazon.com/images/I/41PiVuM7ziL.jpg)**JCJ Halloween Shark Costumes Stitch Onesie Pajamas for Kids Shark Sleeper Pajama Set Hooded for Boys Girls (9-10Y)**JCJ**$26.73**3.8★56 rev](https://www.amazon.com/dp/B0D91DMPLB) [5![HSCTEK Shark Onesie Costume Kids Baby Pajamas Cosplay Sleepwear Clothes 16](https://m.media-amazon.com/images/I/41nv4MHKU5L.jpg)**HSCTEK Shark Onesie Costume Kids Baby Pajamas Cosplay Sleepwear Clothes 16**HSCTEK**$29.17**4.6★270 rev](https://www.amazon.com/dp/B0DB1WDGQC)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![Mavoka Boys Costume Vest Trousers Set Kids Role Play Halloween Party Cosplay 11-12 Years Blue](https://m.media-amazon.com/images/I/317NLzW8VIL.jpg)**Mavoka Boys Costume Vest Trousers Set Kids Role Play Halloween Party Cosplay 11-12 Years Blue**Mavoka**$19.68**2 rev8mo ago](https://www.amazon.com/dp/B0G1CBL9DY) [![JUOLOET Unisex Adult Onesie Pajamas Shark Animal One Piece Snug Fit Halloween Costume Sleepwear Homewear Shark X-Small](https://m.media-amazon.com/images/I/31hHBGJ4n1L.jpg)**JUOLOET Unisex Adult Onesie Pajamas Shark Animal One Piece Snug Fit Halloween Costume Sleepwear Homewear Shark X-Small**JUOLOET**$25.57**471 rev9mo ago](https://www.amazon.com/dp/B0FT147DB3) [![TBGENIUS Shark Blanket Hoodie Onesie for Adults and Kids Cozy Flannel Shark Costume Shark Sleeping Bag](https://m.media-amazon.com/images/I/51ksak3cQAL.jpg)**TBGENIUS Shark Blanket Hoodie Onesie for Adults and Kids Cozy Flannel Shark Costume Shark Sleeping Bag**TBGENIUS**$17.74**213 rev10mo ago](https://www.amazon.com/dp/B0FPVQMTT2) [![NEWCOSPLAY Unisex Adult Shark Onesie Pajamas Animal One Piece Halloween Costume Cosplay Sleepwear (Shark Medium)](https://m.media-amazon.com/images/I/31kW8cInO+L.jpg)**NEWCOSPLAY Unisex Adult Shark Onesie Pajamas Animal One Piece Halloween Costume Cosplay Sleepwear (Shark Medium)**NEWCOSPLAY**$22.38**138 rev11mo ago](https://www.amazon.com/dp/B0FK575M56) [![Newleafly Unisex Kids Shark Onesie Pajamas Soft Cozy Animal Onesie Halloween Cosplay Costume](https://m.media-amazon.com/images/I/31p5-acGQGL.jpg)**Newleafly Unisex Kids Shark Onesie Pajamas Soft Cozy Animal Onesie Halloween Cosplay Costume**Newleafly**$24.64**15 rev1y ago](https://www.amazon.com/dp/B0F99J9VL3)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![Mavoka Boys Costume Vest Trousers Set Kids Role Play Halloween Party Cosplay 11-12 Years Blue](https://m.media-amazon.com/images/I/317NLzW8VIL.jpg)**Mavoka Boys Costume Vest Trousers Set Kids Role Play Halloween Party Cosplay 11-12 Years Blue**Mavoka**$19.68**5.0★**▲ 228%**](https://www.amazon.com/dp/B0G1CBL9DY) [![LIOMENGZI Toddler Baby Boy Hooded Shark Summer Outfit Funny T-Shirt Shorts Set Infant Shark Clothes 6 12 18 Months 2T 3T(Blue Shark 12-18 Months)](https://m.media-amazon.com/images/I/41q6uQK48tL.jpg)**LIOMENGZI Toddler Baby Boy Hooded Shark Summer Outfit Funny T-Shirt Shorts Set Infant Shark Clothes 6 12 18 Months 2T 3T(Blue Shark 12-18 Months)**LIOMENGZI**$13.24**4.6★**▲ 228%**](https://www.amazon.com/dp/B0F37VFKPL) [![haikyuu Kid Shark Costume Grey Pink Yellow Blue Fish Hoodie Boy Girl Halloween Birthday Party Dress Up (blue Small)](https://m.media-amazon.com/images/I/31-FFTQrODL.jpg)**haikyuu Kid Shark Costume Grey Pink Yellow Blue Fish Hoodie Boy Girl Halloween Birthday Party Dress Up (blue Small)**haikyuu**$21.60**3.6★**▲ 225%**](https://www.amazon.com/dp/B0G6FFR4PM) [![ABENCA Shark Onesie Kids Animal Costume Girls Pajamas One Piece Plush Cosplay Halloween Christmas.Grey Shark.140](https://m.media-amazon.com/images/I/31BsA2S5ztL.jpg)**ABENCA Shark Onesie Kids Animal Costume Girls Pajamas One Piece Plush Cosplay Halloween Christmas.Grey Shark.140**ABENCA**$35.46**4.2★**▲ 224%**](https://www.amazon.com/dp/B098J7BZJK) [![NEWCOSPLAY Unisex Adult Shark Onesie Pajamas Animal One Piece Halloween Costume Cosplay Sleepwear (Shark Medium)](https://m.media-amazon.com/images/I/31kW8cInO+L.jpg)**NEWCOSPLAY Unisex Adult Shark Onesie Pajamas Animal One Piece Halloween Costume Cosplay Sleepwear (Shark Medium)**NEWCOSPLAY**$22.38**4.5★**▲ 224%**](https://www.amazon.com/dp/B0FK575M56)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 89 weeks — +11.5% search growth over the last 90 days.

18K13KSpike '25Spike '26 seasonNovDecJanFebMarAprMayJunJulAugSepOctNovDecJanFebMarAprMayJun

Peak months: Sep, Oct, Nov · busiest ÷ quietest = 30.9×

## **Reviews**

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

### **What buyers love **

**Soft Feel**16%

*“The material itself is soft and cozy, and the design is really cute”*

**Gifting Purpose**14%

*“Great gift”*

**Comfort-Overall**10%

*“comfortable”*

**Size-Overall**10%

*“Fit well”*

**Warmth**9%

*“cozy for year round use”*

**Quality-Overall**8%

*“Good quality”*

**Value For Money**4%

*“Great Buy”*

**Advertised Vs Actual Product**3%

*“As advertised”*

**Material Quality**2%

*“Material stays pretty soft”*

**Design-Overall**2%

*“Adorable shark design”*

### **What buyers complain about **

**Size-Overall**37%

*“Pretty big”*

**Durability**9%

*“Ripped the first day”*

**Quality-Overall**9%

*“not well made”*

**Stitch/Finish/Polish**6%

*“the seams were coming apart”*

**Gap/Hole**5%

*“Arrived with hole”*

**Advertised Vs Actual Product**4%

*“Product description was way off”*

**Material Quality**2%

*“The material was very cheap”*

**Thin**1%

*“Thin material”*

**Zipper Quality**1%

*“Also there is NO WAY TO ZIP IT by yourself”*

**Design-Overall**1%

*“not great product design”*

### **Top return reasons **

**Size-Overall**60%

**Length**13%

**Gap/Hole**4%

**Stitch/Finish/Polish**3%

**Advertised Vs Actual Product**3%

**Material Quality**3%

**Sleeve Fit**2%

**Arm Fit**1%

**Shoulder Fit**1%

**Thigh Fit**1%