Broken Base: The fandom is generally grouped roughly based on which series brought you into the fandom, though this has died way down since Gundam's heyday in the early 2000s. The original split was between UC purists and Wingers, with a smaller faction of Seedlings arising later. Gundam 00 was divisive due to its much more Super Robot-styled Gundams and the First Contact plot of the movie given that Absent Aliens has long been a hallmark of the franchise. A later series, Mobile Suit Gundam AGE, has caused some disagreements over its "kiddie" styling (to say nothing of the writing gaffes it suffered in its last two arcs).
Continuity Lock-Out: The main reason for the shift from the UC timeline to alternate universes.
Do Not Do This Cool Thing: Most of the series have a strong anti-war theme, while simultaneously making sure every episode has awesome giant robot battles in it.
Epileptic Trees: Every fans are skeptical on whether the revealed prototype of the kit will be released for general retail, or as a webshop exclusive. Though the results are zigzagged on every new kit produced.
Go ahead and call the Mobile Suits "Transformers", we dare you. note It barely helped that Shōji Kawamori, the designer of the pre-Transformers Diaclone toyline, also designed Gundam-type Mobile Suits.
Be sure to learn that not all Mobile Suits are Gundams before getting into a discussion with fans, or risk ticking them off by calling suits like Zakus or BuCUEs Gundams.
Fanfic Fuel: Even the original Mobile Suit Gundam made it clear that what was shown on screen was simply one small part of a large war. The UC timeline spans over two centuries, and then there are the Alternate Universe series, and that's not even considering fans making their own Gundam AU. There's also less of an aversion to fans making up all-new casts due to the practice of introducing a new lead character for every anime, manga and video game.
Fanon: The fandom is quite good at creating it, given how many Alternate Continuity versions and contradictory source materials there are.
Germans Love David Hasselhoff: Proportionally speaking, the Master Grade line of model kits sells incredibly well in most foreign countries like Australia and the US. This was very likely due to the line's plethora of gimmicks, which consists of of inner frames (If you don't count even older ones), poseable fingers, excellent color separation (current kits), the usage of clear parts etc.
Hypocritical Fandom: Every part of the Gundam fandom have their own opinion on which organization or group should they root for or which series is the best in the entire franchise. This usually led to a lot of debates and despite outlining certain negative aspects that their favorite organizations had or flaws which the series presented, there would always be someone who would deny it; specifically:
Also, some fans will rage against one continuity for having newtype ripoffs, or a Char Clone, overly simplistic messages and what have you, and yet will turn a blind eye to it when such themes are re-used ad-verbatim in the original Universal Century timeline. On the other side, some fans will brand whoever complains about alternate continuities with Double Standards. Complaining about Universal Century, however, is totally OK. Mobile Suit Gundam Unicorn is well-received? Ha! Maybe it's only because it's a Universal Century series! Mobile Suit Gundam 00 is well-received? Of course, it's a really good series! Yeah, they're much more open-minded.
I Am Not Shazam: At least you can find one of the franchise's (inexperienced) fandom referring the other non-Gundam-type Mobile Suits as the said titular name.
Just Here for Godzilla: Why some fans enjoy the franchise despite finding the plots boring and the characters irritating. It's still got giant robots blowing each other up!
Misaimed Fandom: Yes, the Federation has corrupt leaders. Yes, Zeon has many good, moral people who serve it. Yes, the Titans are bad. That being said, it's a little scary how many fans will knee-jerk a SIEG ZEON for a regime that murdered billions of people and continued to wipe out metropolitan centers every few years "for freedom".
Moment of Awesome: The 30th anniversary short "Gundam Perfect Mission", where the protagonist Gundams from every anime up through Unicorn work together to get the Core Fighter into space, where it forms into the original Gundam, the whole thing ending with a "YEAH!" Shot.
Only the Creator Does It Right: Some fans dismiss any Gundam series not set in the UC continuity or made by Tomino regardless of their actually quality.
Rooting for the Empire: For UC, Zeon has far more vocal fans than the Earth Federation. In CE, just mentioning it in reference to the Earth Alliance or ZAFT is likely to cause a Flame War over who was really the bad guy. Ditto, though to a lesser extent, for Mobile Suit Gundam 00. The same debate over whether Vagan or the Earth Federal Forces is worse in Gundam AGE is getting ugly as well. The same goes through Gundam Iron-Blooded Orphans where you got Tekkadan vs. Gjallarhorn (particularly in Season 2) debate.
Tough Act to Follow: Many fans view Tomino's work as this, with anything set in an Alternate Universe very rarely holding up to Tomino's standard. Shows set in Tomino's Universal Century have fared much better, with all of the OVAs (none of which had any input or involvement from Tomino) being highly rated by both fans and Tomino himself.
True Art Is Angsty: Zeta Gundam, while having one of the bleakest endings in all Gundam, is generally considered to be one of the best of them all. Gundam 0080 is similarly dark, and similarly exalted. On the other hand, ∀ Gundam is also considered to be among the best, and it's arguably the happiest Gundam series. Ditto for Mobile Suit Crossbone Gundam another series that avoids the Kill 'Em All status Tomino is infamous for. Incidentally, Tomino wrote Zeta, Turn A, and Crossbones. Gundam Build Fighters, which is orders of magnitude more lighthearted than anything else in the franchise, also got a very positive response.
Win Back the Crowd: After numerous failings, Gundam was completely pulled from US markets. However, the success of Mobile Suit Gundam: The Origin and Mobile Suit Gundam Unicorn overseas, combined with high ratings on official Gundam Build Fighters streams led to the franchise being picked up by Nozomi Entertainment, with a dub of the anime version of The Origin on the way. Gunpla has also been showing up at select Barnes and Noble retailers, and Bluefin opened up a Tamashii Web Shop in the US, with hopes for a Gunpla Shop. And as if to say "sorry" for leaving before ∀ Gundam could be released during Bandai Entertainment's run, it will be one of the first series to be released by Nozomi. Things are looking for a grand return...