* AlternativeCharacterInterpretation:
** Duke Fleed was a {{HotBlooded}} hero, but in the anime he tended to be calmer and quieter when he was not piloting Grendizer. In the manga versions he is hot-blooded the whole time.
** Hikaru Makiba in the anime TookALevelInBadass and went through an AdrenalineMakeover, going from farm girl to flying ship pilot and ActionGirl. The original manga she had not that CharacterDevelopment.
* BrokenBase: Between the MazingerZ / GreatMazinger fans and the ones from Grendizer anime (especially fans from France, Canada and the Middle East for the latter) This is due to the distribution of the anime in this countries previously to the two prequels, leading to the confusion that the former series were actually [[TheyCopiedItSoItSucks rip-offs]] of Grendizer. Besides clarifications over time, there is still a feel of mutual hate, since the anime version of Grendizer differs very much from the original manga and the concept of the whole Mazinger saga, leading over time to Mazinger fans call {{Mazinkaiser}} as the true third series from the saga, and Grendizer fans considering their anime as a self-contained universe, somehow settling the conflict (except if a {{Mazinkaiser}} vs. Grendizer in ''VideoGame/SuperRobotWars'' multiverse turns up...)
* CompleteMonster: Commander Barados and King Vega.
* EarWorm: The Italian theme song. GOOOLLLDRAAAKKE!!!
* GatewaySeries: In France. Arrived in the late 70s on a public channel and created a public outcry. The reason was the ''french'' opening song, that [[WhatAnIdiot some]] found kinda xenophobic, [[ComplainingAboutShowsYouDontWatch extending this to the show itself]]. Was a HUGE success anyway, and it's basically thanks to this show that the anime fanbase ''exists'' in France, since it created the first french generation of anime-fans.
** Many Middle Eastern anime fans name this as their very first anime.
* GermansLoveDavidHasselhoff: ''Grendizer'' has a huge following in the Arab world, as well as in Europe, mostly in the French-speaking parts of both; also in Quebec province.
* HilariousInHindsight: Naming the enemies '''"Vegans"'''. [[spoiler:So living on an herbivorous diet ruins planets and turns you into destroyer of worlds? They might be trying to imply that the enemies are from the star ''Vega'', but still...]]
** To double the hilarity, ''ScottPilgrim'' features people who gain super-powers by becoming vegans. Countdown to Scott Pilgrim/Grendizer fanfic begins now...
* HoYay: Shockingly, a section of the fandom sees the relationship between Kouji and Duke like this. Despite having not evidence for it.
** ''[[GenreBlind Shockingly]]''? [[GenreBlind Puh-lease.]] We have two handsome men who are good friends and rivals -- it'd be odder if some parts of the fandom did '''not''' latch onto this.
* MartyStu: Duke Fleed, unfortunately, is perceived by quite a few to be a good example of this.
* NightmareFuel: Commander Barados' method of dealing with hostages.
-->'''Duke''': "And it was then... That cruel rain began to fall! A deluge from children began to rain upon Fleed. From three-thousand meters in the sky... The children..."
* SequelDisplacement: ''Grendizer'' was aired in France before ''Anime/MazingerZ'', becoming phenomenally popular. When ''Mazinger-Z'' was aired, it was accused of ripping-off one of its sequels.
* ShipToShipCombat: In this franchise's fandom you find two kind of people: those that think that ''[[Anime/MazingerZ Kouji Kabuto]]'' was in love with Sayaka Yumi, and those that think that he barely cared for her like a friend (Sayaka has always been his OfficialCouple or at the very least ImpliedLoveInterest, but you talk about facts to a shipper) and he paid more attention to any other woman that showed up in the series (Misato, Erika, Minerva...). ''[[Anime/UFORoboGrendizer Kouji/Maria]]'' are the largest faction of the second group by far, due to the sheer amount of people watched ''Grendizer'' first. And then you have the people who ships Sayaka with Boss, or the arguments among Duke/Hikaru and Duke/Rubina shippers. However, debates between shippers are refreshingly civil and without mud-slinging.
* TheyWastedAPerfectlyGoodCharacter: Arguably, several of the one-shot Vegan ambassadors/officers, whom could have added some interesting complications to the war ([[spoiler:Rubina being the worst offender in this regard]]).
* TheWoobie: Honestly, Rubina could not catch a break.

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