In the first season, Rai was an absolute beast who had mastered his teammates' techniques and always won easily before his match with Rei and Takao. But in G-Revolution, he's overly emotional, drives himself way too hard, and in general is just nowhere near as impressive.
Rei briefly comes under this during the American tournament in Season 1. After serving as the central character in the China tournament (practically winning his team the final round single-handedly by beating both Mao and Rai, while Max loses to Gao and Takao ties with Rai), he loses two out of the three matches he fights in America (with Kai taking his place in Round 1). As a result, Rei became the first member of the team ever to lose a match before the finals. To add insult to injury, he is subjected to a Curb-Stomp Battle against Eddy, getting taken down 0-2 (incidentally, the first time that that had ever happened in the show as well).
Judy is one of the key figures in defeating Borg in Season 1, organizing the project to get Takao a better blade for his fight against Yuriy and rounding up the remaining bladers with bit-beasts to act if Takao loses after all. And before that, she already showed herself as is a hardworking, talented, dedicated, and no-nonsense woman of science. Come Season 2 and she can do as good as nothing without the Bladebreakers' help and guidance, and also happens to be redesigned with a more generic pretty face than she has in Season 1.
Rei's match against Moses is a subject of heavy debate among the fandom. The Ass Pull victory granted to Moses (a rock from the stadium's remains hit his Beyblade and let it stay in the Stadium while Driger MS lost by stadium out) is either a Heartwarming Moment as his love for his sister pushed him through the battle and allowed him to win, or a cheap victory awarded to someone who really didn't deserve the victory as he did pretty poorly against Rei, who dominated for the majority of the fight.
The art design and character designs changed every season. Which season looks best is a matter of debate.
Mao. The most popular female character by a long shot. So much so that she was one of the few characters to have returned in the Bakuten Shoot Beyblade: Rising manga (and getting more appearances than the rest of her team).
Dizzi also qualifies, especially since she was only exclusive to the dub. When she disappeared in G-Revolution, fans were disappointed by this decision.
The English dub's atrocious one-liners and puns have a more humorous charm when you hear Rei say one in Carlos'svoice (they are both voiced by Daniel DeSanto).
Gordo looks a lot like Android 16 from Dragon Ball, which is funny enough among some other DB-esque designs like Team Psykick's trackers. But in 2014, Akira Toriyama revealed that Android 16 is modeled after Doctor Gero's dead son. This makes the Zeo-Gordo team-up all the more appropriate.
Takao. Yes, he can be a self-centered, arrogant jerk for quite a number of times but you can't help but feel for the guy in G-Revolution since it's revealed he felt alone after his teammates left him to join other teams and even suffered from Heroic BSoD as a result of their abandonment.
Kai. He may be evil and power-hungry in the first season but it was revealed that he was raised in Volkov Abbey, where he would undergo strict training and huge discipline for simply losing. He also suffered trauma from the power of Black Dranzer after attempting to use it, which changed Kai forever.
The manga reveals that Kai's father abandoned him as a child for beyblade which in turn made him hate them and becoming the cold character he's known for.
Narm/Narm Charm: Unsurprisingly, the series is absolutely dripping with it. From the Serious Business of the beyblading itself, to the overly-dramatic and hammy acting (especially from the dub). It's doubtful the fans would want it any other way.
Hiromi gets this reaction due to being a girl who was created just to add a female protagonist to the anime. The problem of "just" is that she wasn't a blader, which really ground some people's gears, and all-around lacked a defined role in the team. The writers had no idea what to do with her besides making her the token girl, so she ended up as good as mobile decor by the third season. She never lives up to the full potential of The Chick, namely being The Heart, possibly because that already was Kenny's role.
Daichi is subjected to this for "stealing" the spotlight from the rest of the cast.
Ming Ming could very well be the biggest scrappy of the series, especially in the dub. Her singing (in the English Dub), her pop star status, her constant attention hogging, as well as her condescending personality towards the Bladebreakers (especially Hiromi) are usually the target for her hatedom. You'll be hard-pressed to find anyone who likes Ming Ming.
Snark Bait: Since its premise is "Save the world WITH SPINNING TOPS!!!1!" and it's not acting the least bit self-conscious about it, the whole franchise is a frequent target of mockery.
Tear Jerker: Rei's battle against Boris, with Boris's bit-beast attacking both Rei's beyblade and Rei himself. Even though the fate of the world is at stake, and the only way the Bladebreakers can get to the finals and stop Borg's evil plans is if Rei wins his battle, his friends are more concerned about Rei's well-being and try telling him to withdraw from the battle. However, Rei keeps refusing to listen to them, and continues to fight even though he's barely able to endure the pain as Falborg's attacks just keep getting worse as the battle goes on. Near the end, Driger ends up sacrificing itself to save Rei's life by shielding him from further attacks, before destroying Boris's beyblade with a powerful Tiger Claw attack. Right afterwards, everyone is excited when the light from that final Tiger Claw attack has cleared up and they realize that Rei has won the battle, but their excitement quickly fades when they notice Rei's unconscious body on the stadium floor.
They Changed It, Now It Sucks!: Subverted. There was considerable initial dislike for the new art style featured in the second season as well as the subtle changes in personality the characters exhibited (e.g. Takao losing all his character development), but the second season's story arc was recieved as much less formulaic and overall more interesting.
Viewer Gender Confusion: There are a few male characters who are likely to be mistaken for female before speaking or being spoke about. Suzuka, Hikaru, and to a lesser extent Olivier and Denny all qualify.
What Do You Mean, It's Not Political?: When you consider that the Majestics' biggest issue is a lack of team spirit, the Europe arc reads a bit like a commentary on the lack of true unity among the member states of the European Union. This view is helped by the fact that each Majestic comes from a different country belonging (or that used to belong) in the EU.
The Woobie: Whilst a lot of characters have their spotlight as this, these characters are arguably the biggest woobies in the series.
Rei can be seen as one after his battle against Boris.
Minami. Yes, he can be somewhat of a nuisance towards Kai but he's simply an average kid who looks up to his idol and wants their influence to make them stronger. What really sets him as a woobie is S2E16, where he was recruited by Team Psykick after being rejected by Kai in hopes of surpassing him. This meant he was used by the team and had the misfortune to tame the cyber bit-beast, Cyber Dranzer, which in return turned the poor guy into a maniac after letting the bit-beast feed on his energy. Once he finished the battle, he starts going insane and crumbles down to the ground and actually dies after Cyber Dranzer was too strong for him to handle (he goes mentally insane in the English dub, which is also pretty heavy). He rests in Kai's arms, leaving Kai regretful for how he treated him whilst Team Psykick leaves him to die. You can't help but feel sorry for the poor guy...
Mathilda. She's shy, timid and quiet as well as being forced to follow the strict rules from her coach, Barthez (which included destroying her own bey for the sake of winning). She is genuinely terrified of her coach since he treats his team very poorly and tends to unleash a lot of his anger on them (as opposed to how the public think of the guy as a saint). In the Japanese version, it's even worse. Barthez physically abuses Mathilda too by pushing her against the wall after trying to stop him from hurting one of her teammates, Miguel.
Daichi. Say what you will about him but his backstory in the movie where his father dies after a construction accident and encourages Daichi to become the best blader is very heart-breaking.
The tabletop game provides examples of:
Author's Saving Throw: The inclusion of the Dual Threat Launcher in Beyblade Burst Evolution is seen as this, after completely skipping the Left String Launcher for both the Metal series andShogun Steel. In general, Hasbro's better handling of Left Spin Beyblades in Burst Evolution compared to Metal Saga.
In the plastic era, the 10bBistool was an absolute beast, especially in official tournaments with their large stadiums. It was good enough to win multiple tournaments... And to appear in the anime as a Beyblade assembled by the Chief to be next-to-invincible among normal Bladers.
For Beyblade Burst, you can glue your Burst Bey to prevent the others from landing Burst Finish. And not many people would actually notice that. However, note two things: first, you can't change out parts anymore if you do; second, this is absolutely against the rules and will disqualify you in official games.
Keep Circulating the Tapes: The plastic era is long gone, but that doesn't stop people from playing it anyway. Since Sonokong (the Korean distributor) didn't pick the series up for a few years, they kept the game in production almost until Metal Fusion started, meaning more availability on the second-hand market.
Shooters and launchers have not changed much over the course of the game's history. The ripcords released for the Hasbro version of Metal Fusion are even the same ones used in the original toys. The String Launcher was celebrated as a major upgrade (being an improvement of the Duel Shooter, itself powerful if inconvenient), but Burst started out the series with ripcords again. Some want the ripcord launchers to have a gearing mechanism for faster spins, while others want the string version to be available from the beginning. Burst getting string launchers in all regions finally is much rejoiced, but brings up questions of why they didn't just start with them besides a Mid-Season Upgrade.
With Shogun Steel, Hasbro just used the same molds as Metal Fury straight until the end. Japan, on the other hand, had redesigned the launchers to be slightly stronger and include the necessary tools to assemble your Beyblade into it. Despite this, some fans thought it was a smart move since it meant players wouldn't have to buy all-new launcher grips again, which were notoriously complicated for Zero-Gnote The grip attached with a screw into the tip tool on top of the launcher and was prone to alignment issues and occasionally falling off.. The Light and String Launchers for the Japanese version also weren't considered to be real improvements, since you had to stand over the stadium since the rip-cord/string had to be pulled straight up instead of to the side.
No Export for You: The original Metal System tops from the Metal Fight Beyblade manga are only available in Japan. A good number of accessories never made it across the Pacific, either. In particular, the string version of the Left Launcher never got used in America despite demand. This likely is because they were only used in the first few chapters of the manga, but never in the anime. Bizarrely enough, the Rev Up Launcher, having the undisputed best launch power available, never got released outside of America except a very late and shortpacked release in Hong Kong of all places.
Polished Port: The Metal Saga String Launcher was surprisingly improved for the Hasbro release, which was nearly identical to the first version of the TakaraTomy version except for a few minor fixes. First, the handle was given a longer bushing to prevent the string breaking, which was never addressed any of the Japanese releasesnote They instead resorted to add-ons to prevent damage, from a piece that made the handle slip if pulled too hard to an honest-to-goodness shock absorber assembly.. Second, it used the somewhat stronger prongs that the second TT string launcher received, making it less prone to breaking there too.
They Changed It, Now It Sucks!: Some fans of the original series were not too thrilled with the Metal Saga and Shogun Steel toys. Common complaints are smaller size (only true when compared to HMS Beyblades), lack of large spikes, and needing a tool to assemble properly. Others didn't like that height played such a big part when older toys are all roughly the same height. Others didn't like the lack of left-spinners, and that spin direction is determined by both the Energy Ring and the Fusion/Chrome Wheel, which limited combinations since they had to be compatible. Most left-spin parts being L-Drago variants and the one ambidextrous Energy ring only working with one Fusion Wheel didn't help. Unfortunately, these changes were made to address previous problems like breakage, since large points created more stress and the metal wheels tend to last much longer. Burst, as a result, addresses some of these complaints by making some of the tops spikier but with thicker plastic and going back to using the metal parts mainly for balance and spin time. However, even this was met with criticism; fans of older series don't like that rounds can end in less than 10 seconds with a Burst Finish, while fans of Metal Saga don't like how samey a lot of parts feel due to all parts of a given type being roughly the same size.