---
title: "Diary of a Wimpy Kid Costume — £35K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/fashion/diary-of-a-wimpy-kid-costume"
last_updated: "2026-07-31T13:28:00.579Z"
locale: en
meta:
description: "Niche score 33/100 · £35K/yr market · 95K searches/yr · £12.39 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 33/100 · £35K/yr market · 95K searches/yr · £12.39 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Diary of a Wimpy Kid Costume — £35K/yr Amazon UK Niche (2026) - Flapen"
---
# **diary of a wimpy kid costume**
**Skip it**
Soft demand (-99.3% this quarter) — this niche doesn't clear our bar today.
Market size 9Growth 0Conversion 38Competition 36Returns 76Price range 33Avg price 53Brand share 11Review moat 98Quality gap 43
**Review moat**
**Incredible****34.54**
avg incumbent reviews — the moat a new listing must climb
**Returns**
**Great****2.0%**
return rate — above 5% kills the launch gate
**Avg price**
**Good****£12.39**
avg listing price — sweet spot $15–$100
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Conversion**
**Okay****3.0%**
search→purchase rate — share of searches ending in a sale
**Competition**
**Okay****63%**
top-5 click share — leaders hold, buyers still browse
**Price range**
**Okay****£6.90–£18.99**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Bad****96%**
top-5 brand share — brand-locked demand
**Market size**
**Bad****£35K**
£35K/yr · 95K searches
**Growth**
**Bad****-99.3%**
90-day search growth — must beat 0% to launch
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=uk&signal=low_review_barrier "Top brand's reviews < 500")
According to Flapen's Amazon United Kingdom niche tracking, diary of a wimpy kid costume is a £35K/yr Amazon United Kingdom market (95K searches/yr). The top 5 brands hold 96% of demand. Verdict: Skip it — 33/100.
Data updated Jul 23, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **diary of a wimpy kid costume market data**
- **Units sold / yr**
- **750–1K**
- avg 0–100/product
- **Revenue / yr**
- **£9K–£12K**
- units × avg price
- **Conversion rate**
- **3.0%**
- **Avg BSR**
- **#4,456**
- **Page quality**
- **0%**
- **Prime**
- **46%**
- **Sponsored**
- **46%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **35 months**
- **Avg seller age**
- **202 days**
## **Competition & brand share**
The top 5 products take 63% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**7 **▲rising
**Sellers**
**8**
**Top-5 brand share**
**96%**
Top 20: 100%
**Top-5 click share**
**63%**
Top 20: 100%
**Open market**
**4%**
- Kavoc26% - Vagile25% - STREETWISE CLOTHING QUALITY CASUAL WEAR18% - SMARTYPANTS10% - Postees8% - Diary Of A Wimpy Kid8% - Open — no brand owns it (1 brand, 4%)
## **Demand**
Weekly Amazon search volume, last 20 weeks — -99.3% search growth over the last 90 days.
35K25KMar '26Mar '26Apr '26May '26May '26Jun '26Jul '26
[**Open Trend **](https://flapen.com/research/uk/fashion/diary-of-a-wimpy-kid-costume/trend)
## **Top diary of a wimpy kid costume search terms**
- **diary of a wimpy kid costume**69K/yr-99.5%0.6% conv. - **diary of a wimpy kid t shirt**5K/yr-96.9%0.0% conv. - **diary of a wimpy kid tshirt**5K/yr-97.0%0.7% conv. - **wimpy kid costume**13K/yr-99.7%0.0% conv. - **diary of wimpy kid costume**3K/yr-99.4%0.0% conv. [**All search terms **](https://flapen.com/research/uk/fashion/diary-of-a-wimpy-kid-costume/search-terms)
## **Top diary of a wimpy kid costume 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.
0%5%£2K10%£4K15%£5K20%£7K1101001K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 13 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Kavoc 3Pcs Halloween Costume Set Including Black White Striped T-shirt Black Socks Shorts (10-12Years Old)**Kavoc**£14.30**4.9★8 rev](https://www.amazon.co.uk/dp/B0F9PBZ4FF) [2**STREETWISE CLOTHING QUALITY CASUAL WEAR World Book Day T Shirt Diary of a Wimpy Reading Shirt Kids Book Day Outfit for School Classroom Reading Fun White 9-11Y**STREETWISE CLOTHING QUALITY CASUAL WEAR**£11.13**4.8★14 rev](https://www.amazon.co.uk/dp/B0GMRW8P4Z) [3**Vagile Kid Diary Inspired by World Book Day Wimpy Kids T-Shirt White**Vagile**£9.72**4.3★18 rev](https://www.amazon.co.uk/dp/B0CW1TPJCS) [4**SMARTYPANTS Diary of a Whimpy Kid T-Shirt Top Tee - World Book Day Kids Childs Funny School Greg Cartoon Face Doodle Humor Present Gift (9-11 Years White Prime)**SMARTYPANTS**£10.85**4.1★48 rev](https://www.amazon.co.uk/dp/B084YSH2R2) [5**Vagile Kid Diary Inspired by World Book Day Wimpy Kids T-Shirt Green**Vagile**£9.95**4.3★18 rev](https://www.amazon.co.uk/dp/B0CW1VP6PN)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**STREETWISE CLOTHING QUALITY CASUAL WEAR World Book Day T Shirt Diary of a Wimpy Reading Shirt Kids Book Day Outfit for School Classroom Reading Fun White 9-11Y**STREETWISE CLOTHING QUALITY CASUAL WEAR**£11.13**14 rev5mo ago](https://www.amazon.co.uk/dp/B0GMRW8P4Z) [**STREETWISE CLOTHING QUALITY CASUAL WEAR World Book Day T Shirt Diary of a Wimpy Reading Shirt Kids Book Day Outfit for School Classroom Reading Fun Red 9-11Y**STREETWISE CLOTHING QUALITY CASUAL WEAR**£10.79**14 rev5mo ago](https://www.amazon.co.uk/dp/B0GMS199T3) [**Kavoc 4Pcs Movie Cartoon Character Costume Include White Beanie Hat T-shirt Black Short Pants and Striped Socks for Book Week Cosplay (M)**Kavoc**£15.67**8 rev7mo ago](https://www.amazon.co.uk/dp/B0GCF3JK44) [**Kavoc 4Pcs Movie Cartoon Character Costume Include White Beanie Hat T-shirt Black Short Pants and Striped Socks for Book Week Cosplay (S)**Kavoc**£15.44**8 rev7mo ago](https://www.amazon.co.uk/dp/B0GCD9GPR6) [**Diary of a Wimpy Kid Best Friends Sketch with Logo Funny T-Shirt**Diary Of A Wimpy Kid**£18.99**5 rev1y ago](https://www.amazon.co.uk/dp/B0FHJ53SZK)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Vagile Kid Diary Inspired by World Book Day Wimpy Kids T-Shirt White**Vagile**£9.86**4.3★**▲ 793%**](https://www.amazon.co.uk/dp/B0CW1XZVCK) [**Vagile Kid Diary Inspired by World Book Day Wimpy Kids T-Shirt Green**Vagile**£9.95**4.3★**▲ 402%**](https://www.amazon.co.uk/dp/B0CW1VP6PN) [**Vagile Kid Diary Inspired by World Book Day Wimpy Kids T-Shirt White**Vagile**£9.72**4.3★**▲ 398%**](https://www.amazon.co.uk/dp/B0CW1TPJCS) [**Kavoc 3Pcs Halloween Costume Set Including Black White Striped T-shirt Black Socks Shorts (10-12Years Old)**Kavoc**£14.30**4.9★**▲ 231%**](https://www.amazon.co.uk/dp/B0F9PBZ4FF) [**SMARTYPANTS Diary of a Whimpy Kid T-Shirt Top Tee - World Book Day Kids Childs Funny School Greg Cartoon Face Doodle Humor Present Gift (9-11 Years White Prime)**SMARTYPANTS**£10.85**4.1★**▲ 102%**](https://www.amazon.co.uk/dp/B084YSH2R2)
**~~View all trending →~~**
## **What buyers say about diary of a wimpy kid costume**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**23%
*“Perfect sizing”*
**Print Quality**20%
*“Good quality t shirt and print and has washed well so far”*
**Gifting Purpose**20%
*“Great gift for Wimpy Kid fan”*
**Washability**10%
*“washes really well”*
**Material Quality**10%
*“Great material”*
**Quality-Overall**3%
*“the overall quality feels above what youd expect at this price point”*
**Design-Overall**3%
*“I also appreciate that the design feels unisex rather than geared solely toward boys”*
**Durability**3%
*“the fabric is soft yet durable”*
**Ease Of Use**3%
*“easy to style for anyone”*
**Stitch/Finish/Polish**3%
*“I noticed how well made each piece feels — the stitching is solid”*
### **What buyers complain about **
**Material Quality**25%
*“Poor quality material”*
**Smell**25%
*“horrible smell to it as well”*
**Size-Overall**25%
*“comes up small”*
**Value For Money**25%
*“Not worth the money”*
### **Top return reasons **
**Size-Overall**74%
**Quality-Overall**11%
**Functionality-Overall**4%
**Neck Fit**4%
**Value For Money**4%
**Ease Of Use**2%
## **Common questions**
- **Is diary of a wimpy kid costume profitable to sell on Amazon United Kingdom?**
- The niche generates £35K/yr across 13 tracked products. 0 of 4 products launched in the last 360 days are still selling. 90-day search growth is -99.3%. Flapen's verdict: Skip it (33/100).
- **How competitive is the diary of a wimpy kid costume niche?**
- 7 brands and 8 sellers compete. The top 5 products take 63% of clicks and top 5 brands hold 96% of demand.
- **What do buyers complain about in diary of a wimpy kid costume?**
- Top complaints mined from reviews: Material Quality, Smell, Size-Overall. The return rate is 2.0%.
- **What does it cost to enter the diary of a wimpy kid costume niche?**
- Listings span £6.90–£18.99; the average listing price is £12.39 (sweet spot $15–$100). The average incumbent carries 35 reviews — the moat a new listing must climb.
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