Char Aznable has legions of fans who will pick an argument with anyone so much as doubting his greatness. Char, a man so popular despite the fact that he emotionally manipulated others for his own gain, blamed others for the tragic consequences of his own actions, and tried to throw a massive asteroid at Earth and cause a nuclear winter for a reason so detached from, well, reason that it might have as well been For the Evulz. Tomino has even stated that Char's views on reality are not in sync with real life. Even Char's own sister Sayla has commented on this. But just try explaining this to the fans.
Even Gihren Zabi gets it himself in some circles of the fandom. That is despite him being behind the bulk of Zeon's war crimes in the One Year War and taking comparisons to Hitler as a compliment. There are even games allowing Zeon to win that envisions a Earth Sphere led by Gihren as a glorious future!
Hell, Zeon in general gets a whole lot of "freedom fighter"-type Pantsing. It's common that Gundam fans need to be reminded◊ that the Sides were not under totalitarian rule nor particularly worse off than Earth, and that the reason the Federation cut their supplies was because they were trying to secede, and wanted the entire population of the Earth to leave with them. Other things to remind them: Zeon fired the first shot, Zeon targeted fellow Spacenoid civilian colonies in the One Year War for the purposes of using them as Colony Drop ammo, and Zeon killed off a third of humanity in under a week while claiming they wanted to liberate them.
There are fangirls of Murata Azrael. He tried to commit genocide against the genetically altered, kills or abuses several sympathetic characters, and believes that the best way to solve political disputes is to kill the people you're having the dispute with, all while thinking he's much brighter than he really is. But they'll excuse that because he's a pretty boy.
Ali Al-Saachez get this from a lot of rabid fans who bash the people whom he's murdered just For the Evulz (Kinue Crossroads is still called a "dumb whore" for trusting Ali and then being murdered by him in cold blood) and cheer when he thrashes the Moral Event Horizon. Yet, many of his fans love to downplay these to play up his impressive piloting skills and his rugged good looks. The infamous "Prince Ali" meme ("Prince Ali, Mighty is He!") says it all in a single song parody.
While Nena Trinity was The Scrappy of the series for a long time, and many of the fans she did have at the time were fully aware she's Cute and Psycho and didn't downplay/excuse her acts of villainy (even calling out those who did it), the airing of the English dub on the Sci-Fi Channel seems to have given her a new fanbase that finds her utterly cute even when she's blowing up weddings out of boredom. She did get Rescued from the Scrappy Heap somewhat by helping Setsuna out of a pinch just to spite on her "mistress" Wang Liu-Mei, an even bigger Scrappy in season two, but that doesn't really excuse the wedding massacre. Though there are some who don't excuse her, but pity her for being a rather wasted character in said second season.
There is also Hallelujah, Allelujah's Superpowered Evil Side. While Allelujah himself is a decent, mild-mannered guy, Hallelujah is a big bastard who enjoys killing his opponents in slow and painful manners and causing Alle a lot of angst. The fangirls? Woobify him and make him into a sex god in their fics. Go figure.
Ribbons Almark. He is a character created in honor of Toru Furuya's role as Amuro Ray, the first hero in the entire franchise - just as Full Frontal is creacted in honor of Shuuichi Ikeda's role as the first antagonist of the franchise, Char Aznable - and thus has a great chance to become one such trope.
Mobile Suit Gundam: Iron-Blooded Orphans: While the series goes into Gray-and-Grey Morality, there are fans who really think Gjallarhorn, particularly Rustal Elion, are the good guys of the show despite their actions include framing protesters for terrorist attacks to justify killing them, denying their enemies the chance to surrender, using illegal weapons, and engineering an assassination attempt of the Arbrau Prime Minister just to provoke a war between two Earth blocs. The show makes it clear that while their actions are pragmatic, they're not really noble and Gjallarhorn itself is already corrupt. And yet, their diehard fans put them on a pedestal and see them as heroes.
◊ that the Sides were not under totalitarian rule nor particularly worse off than Earth, and that the reason the Federation cut their supplies was because they were trying to secede, and wanted the entire population of the Earth to leave with them. Other things to remind them: Zeon fired the first shot, Zeon targeted fellow Spacenoid civilian colonies in the One Year War for the purposes of using them as Colony Drop ammo, and Zeon killed off a third of humanity in under a week while claiming they wanted to liberate them.
