Alternative Character Interpretation: Jewelina, specifically the Twinkle and Kira Deco versions. Some fans believe she isn't as magnanimous as she appears. In Twinkle, they think she resents Fealina for going to the human world or that Akari is being forced to clean up her mess. In Kira Deco, they take issue with the fact that she dumped the Dark General and therefore created the main conflict in the show.
This franchise might be popular in its home country, but America absolutely won't touch it because of the stigma attached to shows for little girls, and even in the fansubbing scene, very few people care about it. And while it got exported to Europe, it didn't do that well there.
For a character example there is Labra, who's reviled by a lot of Western fans for being extremely annoying, but Japan seems to love her to death, as proven by this Pixiv popularity poll.
Archive Panic: 351 episodes (even more if you count the double episodes of Seasons 3 and 7), 6 video games, and a movie.
Awesome Music: All openings and endings are extremely catchy and memorable.
There is a significant divide between fans of the more serious seasons and those of the comedic ones. Expect accusations of not liking Jewelpets if you are on the serious side.
Sweets Dance Princess has some fans in doubt of whether it's a decent first attempt at a film, or just a big shameless ad for the Sweetspets.
Cult Classic: The entire series is nowhere near popular outside of Japan and certain other Asian countries, but has a dedicated Western fanbase regardless. All the separate seasons managed to gain cult followings despite the Broken Base they suffer.
Topaz is one of those Jewelpets that gets very little attention in any season but she's surprisingly popular, probably because of a somewhat different design. That she gets a rather unique personality as a stoic fashion designer in Kira Deco helps too.
Fandom Rivalry: A minor one with My Little Pony: Friendship Is Magic. Threads about MLP in an anime forum invariably feature at least one comparison between the two, followed by wankery about which one is better.
Fanwork-Only Fans: Luea and Larimar were introduced in Lady, where the titular Jewelpets get far less screen time. Magical Change gives these two far more screen time but despite being Vindicated by History is still considered the weakest part of the franchise. A good portion of Luea and Larimar fans are more interested in fan works involving them than either of the aforementioned series.
Popular in Hong Kong, though less so than in its home country. Notable for being the only country to have received a dubbed version for all seasons of the show.
It's pretty popular in the Middle East, despite the first season and Twinkle being the only ones with dubs in Arabic. The Arabic opening has over 4 million views on the Spacetoon Youtube channel.
Portugal also seems to really like the show, judging on how they got every season of the show except Magical Change.
Girl-Show Ghetto: A possible reason for its unpopularity, though being squarely a kids' franchise in a medium that has its Western audience mainly in teens and young adults can't help its case either.
Just Here for Godzilla: Half the fanbase watches just for the pets. Lady viewers were disappointed due to the pets' drastically diminished role, screen time, and action in said season.
"Everything is Ruby's fault."* Because of the reveal at the end of Happiness and Ruby's reputation to cause disaster wherever she goes, fans have taken to joking that the major crisis driving any anime's plot is Ruby's fault somehow. The funny thing is that this is only true of the 2009 show and Happiness so far.
Ruby is Raiden. * She's been featured in some fan videos involving songs from Metal Gear Rising: Revengeance. This one in particular has her jump up to and carve a giant opponent, much like what Raiden does to Metal Gear RAY after throwing it into the air. Both Ruby and Raiden also have white hair (fur in Ruby's case) and red eyes. It helps that Dian is also comparable to Senator Armstrong.
Ruby, I don't feel so good.* Both Rinko and Momona disintegrate into light near the end of their respective series. Bonus points for Dian actually snapping his fingers at Rinko to disintegrate her.
Popular with Furries: The franchise has gained a cult following in the western side of the fandom. However Ruby, Garnet, and Sapphie are very popular in the Japanese side of the fandom due to their cute appearances.
Nightmare Fuel: The scene in the movie where Paku morphs into his monstrous form will most likely startle first-time viewers because of the way it's filmed, with Gumimin somersaulting in the sky and the first you see of his face being his snout with all of his teeth bared and demented-looking eyes.
No Yay: Reaction of the fans who aren't okay with human-Jewelpet romance.
Periphery Demographic: At first, the entire franchise appealed to girls only. It was with the release of Twinkle, followed by Sunshine, that the series started appealing to older demographics, including otakus.
Ruby gets this to a lesser extent. Being the mascot and the protagonist does give her her share of haters, due to overexposure. Of course, some do find her genuinely annoying as a character.
Ship-to-Ship Combat: A good number of people object to Ruby being with Granite and wish she had stuck with Tour instead.
They Wasted a Perfectly Good Character: The majority of the Jewelpets are underused. Even seasonsthat supposedly give the focus to the Jewelpets aren't very good at making this better, since they focus too much on the mascots. Topaz and Kris (possibly others) suffer the most; you have to look very hard to even spot them in some seasons.
Unpopular Popular Character: King is considered the most unpopular Jewelpet in-universe; a poll in an episode of the first series shows him dead last. He's actually reasonably popular with the fandom. Loser-y, abused pets such as Coal and Io are also well-liked.
The Sweetspet Chocola is the largest of her lot and has a rather dark color scheme, leading people to believe she's male at first glance. Not helping matters is how all the Sweetspets, males included, are voiced by women, and they show up too little to draw the right conclusion.
Most of the Jewelpets voiced by women are liable to get this because they're all so uniformly cute.
Io is a particular species of rabbit characterized by having droopy ears; it's easy to think that he's a dog, especially in Twinkle, where he forms a trio with two dog Jewelpets. The mistake would go on to receive lampshades in Kira Deco and Happiness.
King is supposed to be a French bulldog, but his color scheme makes him look like some sort of creature who decided to wear a pink rabbit outfit... with a pig-like tail. Truly the stuff that Mind Screw is made of.
Coal is a capybara, a rather obscure animal. Most people think bear or hippo when they first see him.
Milky is a Chihuahua, but due to her pointy ears she's sometimes thought to be a cat.
On the other side of the coin, the Scottish Fold Alex is sometimes taken for a dog, again, because of his ears.
Nintendo Hard: It's like an unholy mix between Osu! and Parappa The Rapper. Getting a perfect clear needs serious memorization on which musical flower you need to touch. The later games updated the mechanics making it even harder to beat.
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