---
title: "Rosalina Costume Kids — $41K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/rosalina-costume-kids"
last_updated: "2026-08-10T23:03:10.451Z"
locale: en
meta:
description: "Niche score 57/100 · $41K/yr market · 96K searches/yr. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 57/100 · $41K/yr market · 96K searches/yr. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Rosalina Costume Kids — $41K/yr Amazon US Niche (2026) - Flapen"
---
# **rosalina costume kids**
**Worth a look**
Shows demand growing +240.9% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 10Growth 98Conversion 16Competition 38Returns 77Price range 95Avg price 95Brand share 47Review moat 97Quality gap 65
**Growth**
**Incredible****+240.9%**
90-day search growth — must beat 0% to launch
**Review moat**
**Incredible****64.33**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Incredible****$33.49**
avg listing price — sweet spot $15–$100
**Price range**
**Incredible****$24.01–$40.66**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Returns**
**Great****1.9%**
return rate — above 5% kills the launch gate
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Okay****77%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****62%**
top-5 click share — leaders hold, buyers still browse
**Conversion**
**Bad****1.3%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Bad****$41K**
$41K/yr · 96K searches
**Signals**[** Trending**](https://flapen.com/research/niches?market=us&signal=trending "Search growth > 100% (90d)") [** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500") [** Out of Stock**](https://flapen.com/research/niches?market=us&signal=out_of_stock "OOS rate > 10%")
According to Flapen's Amazon United States niche tracking, rosalina costume kids is a $41K/yr Amazon United States market (96K searches/yr). The top 5 brands hold 77% of demand. Demand peaks in Apr–May–Sep–Oct. Verdict: Worth a look — 57/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **rosalina costume kids market data**
- **Units sold / yr**
- **1K–1K**
- avg 0–100/product
- **Revenue / yr**
- **$33K–$42K**
- units × avg price
- **Conversion rate**
- **1.3%**
- **Avg BSR**
- **#768**
- **Page quality**
- **0%**
- **Prime**
- **72%**
- **Sponsored**
- **89%**
- **Out of stock**
- **22.2%**
- **Avg brand age**
- **31 months**
- **Avg seller age**
- **167 days**
## **Competition & brand share**
The top 5 products take 62% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**13 **▲rising
**Sellers**
**24**
**Top-5 brand share**
**77%**
Top 20: 100%
**Top-5 click share**
**62%**
Top 20: 100%
**Open market**
**18%**
- The Super Mario Galaxy Movie34% - Szytypyl15% - Binbo12% - Anjite9% - Mukola8% - ZIW6% - Open — no brand owns it (7 brands, 18%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +240.9% search growth over the last 90 days.
6K4KPrime Day '24Spike '24Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Apr, May, Sep, Oct · busiest ÷ quietest = 17.9×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/rosalina-costume-kids/trend)
## **Top rosalina costume kids search terms**
- **rosalina costume kids**82K/yr+268.8%0.7% conv. - **princess rosalina costume kids**10K/yr+79.8%0.1% conv. - **rosalina costume girls**5K/yr+159.9%0.1% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/rosalina-costume-kids/search-terms)
## **Top rosalina costume kids 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%10%$4K20%$8K30%$12K40%$16K1101001K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted
All 18 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**The Super Mario Galaxy Movie Girls Fantasy Gown Nightgown ROSALINA FANTASY GOWN 3T**The Super Mario Galaxy Movie**$24.01**4.9★34 rev](https://www.amazon.com/dp/B0GLRCTXLP) [2**Szytypyl Princess Rosalina Costume for Girls One Shoulder Fancy Dress Gowns with Accessories Green**Szytypyl**$39.60**4.9★27 rev](https://www.amazon.com/dp/B0GW842G8T) [3**Binbo Princess Rosalian Costume Dress kids Grils Halloween Cosplay Birthday Party Outfit 5-6Y**Binbo**$35.43**4.8★26 rev](https://www.amazon.com/dp/B0GVDVBBKW) [4**Mukola Kids Princess Costume Girls Galaxy Movie Off Shoulder Fancy Dress with Crown Wand Accessories Cosplay Party**Mukola**$35.29**3.9★15 rev](https://www.amazon.com/dp/B0GSZGGG4S) [5**ZIW Princess Rosalina Costume Kids Girls Blue Dress with Wig Wand Crown Earrings Plush Galaxy Princess Outfit for Halloween Party Dress Up ZW264L**ZIW**$39.69**4.5★14 rev](https://www.amazon.com/dp/B0GTMF9X8G)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Anjite Girls Galaxy Princess Rosalina Costume Kids Royal Dress Up with Teal Maxi Dress Wig Crown Wand Earrings for Halloween AJ097L**Anjite**$40.66**8 rev2mo ago](https://www.amazon.com/dp/B0GZWNJZ2N) [**Girls Princess Rosalina Costume Dress with Accessories Blue Princess Dress with Wig Wand Crown Earrings and Star Earrings AJ081M**Anjite**$36.96**3 rev2mo ago](https://www.amazon.com/dp/B0GY89M86X) [**ZENGOR CENDA Halloween Costume For Girls Toddler Galaxy Princess Dress Up With Accessories Birthday Party Outfits**ZENGOR CENDA**$33.83**22 rev2mo ago](https://www.amazon.com/dp/B0GY9CSFMJ) [**Szytypyl Princess Rosalina Costume for Girls One Shoulder Fancy Dress Gowns with Accessories Green**Szytypyl**$39.60**27 rev3mo ago](https://www.amazon.com/dp/B0GW842G8T) [**Szytypyl Princess Rosalina Costume for Girls One Shoulder Fancy Dress Gowns with Accessories Green**Szytypyl**$38.94**27 rev3mo ago](https://www.amazon.com/dp/B0GW87885M)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Mukola Kids Princess Costume Girls Galaxy Movie Off Shoulder Fancy Dress with Crown Wand Accessories Cosplay Party**Mukola**$35.38**3.9★**▲ 35%**](https://www.amazon.com/dp/B0GSZ9TYLY) [**ABHOH Princess Rosalina Costume Kids Girls Star Galaxy Dress with Accessories Celestial Outfit Wand Crown Earrings Plush Set for Birthday Halloween Dress Up AB026L**ABHOH**$34.13**4.2★**▲ 34%**](https://www.amazon.com/dp/B0GTMPW7R9) [**IDOTTA Girls Princess Costume for Kids Cosplay Fancy Dress up with Crown Magic Wand**IDOTTA**$26.99**2.0★**▲ 34%**](https://www.amazon.com/dp/B0G2PQQK7D) [**ZENGOR CENDA Halloween Costume For Girls Toddler Galaxy Princess Dress Up With Accessories Birthday Party Outfits**ZENGOR CENDA**$33.83**4.4★**▲ 34%**](https://www.amazon.com/dp/B0GY9CSFMJ) [**Anjite Girls Galaxy Princess Rosalina Costume Kids Royal Dress Up with Teal Maxi Dress Wig Crown Wand Earrings for Halloween AJ097L**Anjite**$40.66**4.7★**▲ 34%**](https://www.amazon.com/dp/B0GZWNJZ2N)
**~~View all trending →~~**
## **What buyers say about rosalina costume kids**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**29%
*“AMAZING QUALITY”*
**Size-Overall**27%
*“My daughter told me the size for the age was very accurate she also remarked about the quality of the costume was very good for the price”*
**Material Quality**7%
*“Durable material and very reliable”*
**Value For Money**5%
*“Overall I thought the costume was well priced”*
**Durability**4%
*“The fabric feels nicer than many children's costumes, and the stitching and overall construction seem durable enough to hold up to repeated dress-up sessions”*
**Soft Feel**4%
*“Silky Dress”*
**Color**3%
*“The color is great”*
**Design-Overall**2%
*“help complete the look”*
**Add-Ons/Attachments**2%
*“Includes fun accessories”*
**Ease Of Use**2%
*“It is easy to put on”*
### **What buyers complain about **
**Size-Overall**32%
*“I did get it a little too big because kids grow fast”*
**Brightness/Shine/Glow**18%
*“gets glitter everywhere”*
**Advertised Vs Actual Product**8%
*“Inaccurate picture”*
**Durability**5%
*“gems fell off easy”*
**Value For Money**5%
*“Waste of time and money”*
**Stretchability/Expandability/Elasticity**3%
*“- Material is not stretchy”*
**Quality-Overall**3%
*“Very bad quality”*
**Strength**3%
*“Flimsy”*
### **Top return reasons **
**Size-Overall**73%
**Advertised Vs Actual Product**8%
**Material Quality**3%
**Quality-Overall**3%
**Value For Money**2%
**Defective Material/Parts**2%
**Stitch/Finish/Polish**2%
**Color**1%
**Gap/Hole**1%
**Comfort-Overall**1%
## **Common questions**
- **Is rosalina costume kids profitable to sell on Amazon United States?**
- The niche generates $41K/yr across 18 tracked products. 7 of 16 products launched in the last 360 days are still selling. 90-day search growth is +240.9%. Flapen's verdict: Worth a look (57/100).
- **How competitive is the rosalina costume kids niche?**
- 13 brands and 24 sellers compete. The top 5 products take 62% of clicks and top 5 brands hold 77% of demand.
- **What do buyers complain about in rosalina costume kids?**
- Top complaints mined from reviews: Size-Overall, Brightness/Shine/Glow, Advertised Vs Actual Product. The return rate is 1.9%.
- **When does demand for rosalina costume kids peak?**
- Demand peaks in Apr–May–Sep–Oct; the busiest month runs 17.9× the quietest.
- **What does it cost to enter the rosalina costume kids niche?**
- Listings span $24.01–$40.66; the average listing price is $33.49 (sweet spot $15–$100). The average incumbent carries 64 reviews — the moat a new listing must climb.
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