During the break mission at the Kilimanjaro base, Juno and Sakura nearly get caught out by both Amuro and Quattro after both Akihiro and Hermes end up in the picture at the end of the mission. Although you get out of the mission before the two get wiser, Juno still panic over the fact that both the White Meteor and the Red Comet were capable of catching them out.
The mission based around SD knight Gundam is also a great laugh. They had more variants of Zaku in a fantasy setting than in real life.
Bellri Zenam, coming from one of the Lighter and Softer Gundam anime, is a repeat offender when it comes to funny quotes, what with his somewhat clueless demeanor.
When fighting alongside units from the One Year War, he'll usually comment on how ancient they are.
Graham: Here we go, Flag Fighter! Don't fall behind now! Allelujah:<sighs> Certainly bold, I suppose…
Julieta (with Graham): Between Master Iok and Vidar… Why are there so many weirdos here?
Mafty: That Gundam's a veritable berserker. Mikasuki: That's how yours looks to me. It's big and it flies.
Lane: Even I can't guarantee you'll survive in a piece of junk like that. Hayato: I wouldn't underestimate the Guntank, Lt. Lane! This thing can even fly in a pinch!
Season 2!Setsuna: Does that massive Gundam use a new model GN Drive? Lane: It's the mother of all Minovsky Flight units. I won't have you lumping it in with some sketchy power.
Jutta Quasim: That legless giant… Is it a relic? It reminds me a bit of Catl. Hayato: Huh? God uses tank treads???
Banagher: Bright helped get my head on straight when he told me not to let all this get to me. Judau: Huh, you know Captain Bright? That guy doesn't know when to shut up, does he?!
Garrod: Hey, how much you figure that Gundam's worth? Mikazuki: It's not for sale. It belongs to Tekkadan. Orga wouldn't like it if I sold it.
0079!Char: Ever hear of the Red Comet? Suletta: Hello, Mr. Red Comet… That mask suits you.
Shiro: So you're my partner? Watch my six, okay? Suletta: P-partner?! I'm promised to Miorine, so I… I can't!
Marida: Relax! Too much tension and you'll lose sight of what's in front of you. Suletta: O-okay! Deep breaths! <comically breathes in and out> There!
Domon: Let's go! Gundam Fight! Ready…! Suletta: Um, "victory is not determined by the condition of the mobile suit al…" Hey, just wait a minute, please!
Garrod: So you've got someone you like? Be sure to treat them well! Suletta: W-w-w-wait… I, uh, y'know… I really don't get it…
If Suletta teams up with Rondo Mina Sahaku and the Gold Frame Amatsu Mina, Mina asks to show her how she dances (as in, how she pilots and fights). Suletta responds with the GUND-ARM Inc. jingle, suggesting she actually is dancing!
Allelujah: Let me introduce you to Marie later. Suletta: Mr. Allelujah, is Marie y-y-your… Oohhh!
Gaelio: Barbatos… I never thought I'd be helping you people. Mikazuki: Oh, you're that guy with the chocolate man… Gali-Gali, was it…? Anyway, let's do this thing.
Domon: That color! Is that a Super Mode?! Quattro (in the Hyaku-Shiki): If color boosted output, the battlefield would be littered with golden Mobile Suits.
Domon: Okay, show me what you can do! Heero: I don't fight with fists. You and Wufei would get along like gangbusters.
Akihiro: Did you… just talk to your Mobile Suit? Heero: I'm just talking, Akihiro Altland. Don't worry about it.
le Creuset: Rau le Creuset. Charmed. 0093!Char: A mask? Talk about a blast from the past.
Rey: I'll grow as strong as I have to to make your dream a reality, Chairman. 0093!Char: Chairman? But I'm Commander of Neo-Zeon.
0093!Char: The people on Earth do nothing but pollute it. Their souls are weighed down by gravity. Akihiro: So you wanna be free of those asses in control, yeah? Sounds just like us!
Julieta: What's a leader doing on the frontlines?! You should let us handle this! 0093!Char: My word… Though I prefer piloting to politics.
Bellri (alongside Setsuna): You're fighting to end war? Agh! I don't get it!
Domon: Let's get this Gundam Fight on the road! Season 2!Setsuna: Gundam… Fight? Was this form of conflict part of the Aeolian Plan?
Movie!Setsuna: For the sake of dialogue… Let's go, Mikazuki Augus. Mikazuki: What do you do about an enemy you can't talk to? What else? Kill them before they kill you.
Mikhail: Let's clear these guys out, then drink and be merry! 0079!Amuro: Um… how do I say this…? I can't… I'm a minor.