These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Americans Hate Tingle: Two Scrappies in North America, Nena Trinity and Marina Ismail, are two of the most beloved Gundam 00 females in Japan, ranking eighth and tenth (respectively) on a April 2008 Newtype magazine poll for the top ten anime females. They were also the only two females from 00 to rank. While both were supplanted by Feldt Grace during the second season's airing, they still remain quite popular.
Broken Base: Other than analyzing the technological aspects of the setting, you'll almost never see any two fans agreeing on anything about this show. Many fans were awestruck by its Super Robot style and emphasis on its message and overtones. Other fans thought it was poorly written with every solution being solved by using a new weapon or power, rather than thinking of a clever solution. The movie is universally poorly thought of.
Oh the movie is still YMMV, in that a number of viewers had enjoyed it despite its perceived shortcomings.
Cargo Ship: Graham Aker/Gundam. Graham's blatant pick-up lines to the Gundams he encounters while generally thinking of the pilot as an afterthought does not help his case.
There's also Setsuna F. Seiei, who holds his Gundams in a very high regard.
Crowning Moment of Heartwarming: Marie Parfacy's line to Sergei Smirnov in episode 7 of season two: "The Soma Peries inside me has this to say: 'I wanted to be your daughter...'." Also doubles as a Tear Jerker to some fans.
Feldt Grace has a couple of these with Setsuna F. Seiei at the end of both seasons right before the final battle. Said scenes are also where Setsuna and Feldt get their massive level of obligatory Ship Tease.
Any of the opening and ending themes, but especially the final ED "Trust You". Playing it over the loudspeaker system at an anime convention is a good way to garner resounding, sweeping cheers from the entire 'con.
Ensemble Darkhorse: Fandom loves Patrick Colasaur, and fandom loves Feldt Grace. What more do you need know?
On the Japanese side, Union pilot Joshua Edwards gets a surprising amount of fanart, and is even sometimes paired with Graham Aker in doujinshi. Not bad going for a guy who only appeared in two episodes and got about three minutes of screentime (if that) in total. Oh, and Nena Trinity, in contrast to in the West.
Foreshadowing: In franchise, we have a Celestial Being: The Movie in A wakening of the Trailblazer with dragon-like mobile suits, doesn't remember anything....
Fridge Horror: The Trinity siblings' whole existence. Their "work" consists of shooting at soldiers, munition workers and the like. Then it appeared later that the Trinities' work is getting shot at, not shooting at people. Their sorties assigned by Ribbons are meant to accumulate hate for Celestial Being, creating a chance for him to deploy the GN-Xs and Innovades. The Trinities had little support from the Ptolemy crew and used inferior machines. They aren't able to fight well if anyone gets KIA since their tactic relied on co-operation heavily. With a bit of luck they're not destroyed in their first contact with the GN-Xs, so Ribbons had to dispose them through Ali. Nena survives, but Ribbons eventually gets her killed as well. So, all the Trinities ever amounted to were pawns for FUCKING RIBBONS!Draco in Leather Pants aside, that's sad.
God-Mode Sue: Justified with the 00 Raiser, given that it was intentionally conceived to be precisely that.
Though in execution it subverts the trope every bit as much as it plays it straight, if not moreso...
He's Just Hiding: Played around. Episode 10 ends with Sergei Smirnov getting caught in the blast of Memento Mori, making people think he bit the dust. Then in Episode 11, the first scene shows him unscathed. He really WAS hiding... At least until Episode 17. RIP, Papa Bear. And, in a literal sense, Aeolia Schenberg – at least until Alejandro finds him.
Hilarious in Hindsight: In the first season, the Irish Republican Army and the Tamil Tigers are mentioned as still fighting, three hundred years later. Barely two years after the episode aired, the IRA ordered an end to its armed campaign and the Tamil Tigers were defeated. But it does say that the fighting has been on and off for years. So maybe justified.
The super deformed omake that parodied the preview of season 2 stated that Lockon would be back as a ghost and that Tieria would be revealed as a robot. Did the writers accidentally spoil the series?
Over in the Foe Yay corner, there's Ribbons Almark and Tieria Erde. To make matters worse, Ribbons' seiyuu stated that he was told by the directors to deliver the line where he offers Tieria regained access to Veda in a highly erotic manner.
There's also that official poster in which they're gyrating their hips together whilst piercing each others' eyes with deep, hate-filled glares of death...
Speaking of Foe Yay, there's always Mr. Bushido and "This feeling – it must be love!"
Princess Marina Ismail and her lady-in-waiting Shirin Bakhtiar give off significant Les Yay vibes, especially on Shirin's behalf.
Narm: In general, the characters' tendency to switch to Full-Name Basis during dramatic moments is a rich and delicious source of narm. There are plenty of more specific events as well, though:
Marina's song. It's supposed to be very dramatic and heart warming, but most people need to turn down the volume it's so enormously bad.
It is similarly moment-killing how, in the conflict at Point ES-8874 (Ep. 18, where Celestial Being has to fend off the pursuing A-Laws fleet), everyone's pent-up emotions about the people they value just had to cap it with the most aloof characters (and the canon Cargo Ship ones, at that!) in the bunch:
Setsuna's obsession with Gundam counts as both Narm and Narm Charm due to how he often repeats it. For example, in the first season's finale Setsuna makes heartwarming speech only to finish with "We are all Gundam!"
Hallelujah/Allelujah's voice in the English Dub can be a bit unintentionally hilarious especially if the VA himself voiced InuYasha. Brad Swaile as Setsuna F Seiei can sometimes be this too for some fans in certain dramatic scenes.
Replacement Scrappy: In story, Lyle Dylandy was this for a while. In fandom he bounces in and out of the trope, since one part of the fandom likes him, another won't stop whining because he's not a carbon copy of his replacee, and yet another hates him because he's too much like said replacee in the wrong places and feels like They Wasted a Perfectly Good Plot.
Nena Trinity, when she provided back up for Setsuna F. Seiei with her shuttle while facing an Innovade, and solidified when she killed WangLiu Mei, an even bigger Scrappy.
Romantic Plot Tumor: Saji and Louise in the second season. While it made sense in the first season, it can be argued that they overtook most of the plot in Season 2 with both becoming pilots, and taking time away from other characters that may have benefited more from getting their stories explained.
Rooting for the Empire: In the first seasons its a little hard to root for Celestial Being with their blithe superiority and judgemental attitude, especially given the awesome of people like Graham and Sergei almost beating the invincible Gundams. The second season makes you think this intentional as its all about Celestial Being fixing what they screwed up.
For the first part of season two, it looked like Saji Crossroad was thrown back to the heap after his constant ignorance to think that 'Gundams and Celestial Being are bad!' even though they're struggling for the 'good' this time...
He got out of the heap again after he decides on his own to pilot the 0 Raiser and then speaks to Louise.
Wang Liu Mei is also getting a lot of heat for being a bitter, spoiled Rich Bitch who's all bark and no bite and constantly plays both sides because she hates the world and supposedly wants to "change" it (through destruction, of course).
Anew Returner is erstwhile described as a blatant Four clone, but that was resolved.
Even with Louise Halevy's heartbreaking tragedy, she lost some sympathisisers by giving into He Who Fights Monsters and joining the villainous A-LAWS. In other cases, some fans don't like her simply because she killed Nena.
Not anymore! Based on the movie and its manga adaptation, it seems that 00 has finally chosen the winning ship: It's Setsuna/Marina. He uses his ELS traits to restore Marina's youth and eyesight, and Setsuna finally breaks from his Chaste Hero self by marrying the princess.
The manga which isn't part of the official canon according to Sunrise's policy. They end up marrying, and even then the manga author explicitly stated that their marriage is purely symbolic, representing their mutual understanding of each other. The movie leaves it ambiguous and can be seen as a son returning to his mother.
They Wasted A Perfectly Good Character: Even for those that despise her, there had to have been a point for Nena Trinity to survive Season 1. During the few moments she was seen in Season 2, it appeared that she was developing a conscience and becoming less insane, albeit through a process of ego and seeing even worse individuals, and even did some good for a change by helping Celestial Being destroy Memento Mori and killing Wang Liu Mei. Unfortunately, the Nena/Louise dynamic was never fully explored beyond all the ways Louise wanted Nena to suffer, and ultimately, instead of a grand confrontation where either Nena realizes the horror that others have been put through or Louise realizing the folly of wanton revenge before it was too late, we saw Louise figuratively stuff Nena into a fridge with ease, which makes you wonder what was the point of even developing Nena's character in the first place.
Trapped by Mountain Lions: Saji Crossroad and Louise Halevy, who were used to provide the "normal civilian" view of Celestial Being's world-changing events, at least until episode 18 of season one.
Marina Ismail seems to be this for the entire run.
Unfortunate Implications: Memo to Lockon II - there are quite a number of perfectly reasonable, acceptable ways to try to rescue your Brainwashed and Crazy girlfriend. Ripping off her mech's chest armour whilst yelling 'I'LL MAKE YOU MY WOMAN AGAIN!' is not one of them.
Viewer Gender Confusion: Hands up whoever thought Tieria Erde was a girl before they heard his voice? In fact, many of the Innovades are guilty of sparking debates far and wide as to their true genders.
It doesn't help that Word of God likes to play cute about the issue in interviews, either.
Ribbons Almarks' Opposite-Sex Clone of sorts, Hiling Care, is an even worse offender of this, but in reverse: despite being flat-chested and showing up at a party wearing a tux, her voice and pronoun usage all indicate that she's female... and it's not until episode 13 of season two that she wears something tight enough to contrast against her AA-cups.
The English dub either ran into this problem or decided to have that last little bit of fun at the viewers' expenses, and made roughly half of them explicitly female.
The Woobie: Pretty much all Marina does, having her country nearly destroyed by a civil in war the first season, in season 2 she's arrested for having met Setsuna, and then later goes and finds that her country was burned to the ground.