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[[folder:Sei Iori]]
->Voiced by Creator/MikakoKomatsu

->Main Gunpla: [=GAT-X105B=] Build Strike Gundam, [=RX-178B=] Build Gundam Mk-II, [=GAT-X105B/ST=] Star Build Strike Gundam, [=GAT-X105B/CM=] Build Strike Cosmos, [=BG-011S=] Star Burning Gundam

A young boy whose family owns a model shop. While he's extremely talented at building Gunpla, he is utterly terrible at fighting with them.
* {{Adorkable}}: Especially manifest when he fawns over Gunpla.
* BerserkButton: When [[spoiler:Nils]] shows that he only thinks of the tournament as a way to find out about Plavsky particles, Sei is ''pissed''.
* ChasteHero: Incredibly naive when it comes to girls and romance. When he's asked about China's swimsuit, he analyses it ''as if it were a Gunpla''.
** On the other hand, he knew Mr. Ral is head over heels for his mom, and [[HappilyMarried justifiably disapproves]]. And as for the analysis of China's swimsuit, he's also visibly flustered.
* CurtainsMatchTheWindow: Blue hair and eyes, which he got from his mom.
* ColorFailure: With his mother and China, upon seeing [[spoiler:Aila in a ModestyTowel]] in episode 22.
* TheEngineer: Even if he's a poor fighter himself, the models he builds are sought after by numerous other Gunpla Battle players for their quality.
** Though the final episode reveals this is only because he subconsciously didn't want to see his models get damaged. [[spoiler:Sei proves to be an excellent pilot once conquering this fear.]]
* EnergyAbsorption: The Star Build Strike's shield can absorb any energy fire, the energy it takes is used for the Discharge system.
* {{Expy}}: Of [[Manga/{{Heroman}} Joey Jones]]. They have the same voice actress, both enjoy building model or toy robots, both have fantasies of heroism, both look up to their fathers, but much more closely resemble their mothers.
* GenreSavvy: Sei's knowledge of the Gundam series allows him to create clever traps he had seen in various Gundam series.
* GuyInBack: Sei is essentially this for Reiji, serving as a flight engineer, combat strategist and additional set of eyes.
* HotBlooded: Starts off as a sweet kid, but becomes increasingly amped up during the Gunpla World Championship [[spoiler: to near Tatsuya levels of intensity during the final battle.]]
* {{Irony}}: Sei is very good at making Gunpla, and his father was a world champion-level Gunpla Battler… but Sei himself has crap reflexes, so he has to rely upon someone else to "pilot" his machines, while he is relegated to MissionControl.
** Well… at first, anyway. [[spoiler: By Episode 23, that ends, and Episode 25 shows him being just as badass as Reiji.]] It also turns out that the reason his reflexes were crap was because of his subconscious desiring to avoid too much damage in his creation.
* LogicalWeakness: As many have pointed out, the energy absorption system of the Star Build Strike is useless against solid/shell weaponry. Also, It cannot absorb energy levels that are too high like Gundam X Maoh's cannon blast. Lastly, anyone who can figure out how long the discharge system lasts can use it to their advantage.
* MoeAnthropomorphism: Played with. His color scheme, along with the design of his casual clothes (especially his 4 point star t-shirt), evoke a cute kid version of Federation mecha designs from the UC continuity in ''Gundam''. His seafoam-green hoodie and orange shirt, as well as much darker blue eyes, are evocative of the [[http://www.mahq.net/mecha/gundam/unicorn/rgm-89d.htm Jegan]].
* NextTierPowerUp: Upgrades from the Build Strike to the Build Mk-II in episode 6, then Mk-II to Star Build Strike in episode 10.
* NotWhatItLooksLike: He just wanted to talk about Gundam and Gunpla with Mihoshi and was more upset about losing a Gunpla-loving friend than her [[spoiler: sabotaging the Build Strike's joints]].
* ObliviousToLove: Poor China. [[spoiler:Though episode 9 implies he [[LuminescentBlush might not be that oblivious after all]]. In episode 18, he actually ''tries'' to ask her out on a date.]]
* OfficialCouple: With China. They're paired up from quite early on in the show, and by the mid-teen episodes, they appear to be dating. Come the [[https://www.youtube.com/watch?v=7X273gZ0jDA Blu-Ray edition extra scene]], [[TheyDo they're living together in Paris, France.]]
* RedOniBlueOni: The Blue to Reiji's Red.
* SheIsNotMyGirlfriend: Says this to Caroline about China.
* SleepyHead: Works way too late on his models, causing him to often be tired during the day.
* StrongFamilyResemblance: Looks exactly like his mom, only shorter and male.
* SuperMode: The Star Build Strike's RG system allows it to channel Plavski Particles into itself, thus increasing it's capabilities. The mode itself borders on DangerousForbiddenTechnique because utilizing this mode wears the Star Build Strike faster, becoming more susceptible to damage.
* TookALevelInBadass: In Episode 23, [[spoiler:he has a free battle against Reiji and manages to hold his own, thanks in part to Reiji's skills being balanced out by the Build Mk-II being a superior model to his straight-build Beginning Gundam.]] [[LampshadeHanging Lampshaded]] by Mao, who remarks that anyone who's participated in the World Championship, even with a partner, is bound to improve.
** In Episode 25, [[spoiler: he fights Meijin III to a standstill, and would probably have won.]]
* ToBeAMaster: He wants one of the models he built to make it into the Gundam Battle world championships.
* {{Tsundere}}: When it comes to Reiji. He often tells off his friend, while also really wanting to compete in Gunpla battles with him.
* WeirdnessMagnet: Seems to attract a lot of odd people, like Reiji and Mao. Also lampshades this fact.
-->'''Sei:''' Do you think I attract weird people?\\
'''China:''' Yeah, I think so.
* WillfullyWeak: [[spoiler: As it turns out, the reason for his poor piloting had nothing to do with a lack of skill. He was too worried about damaging his Gunpla to focus on the battle. As mentioned above, once he overcomes that fear, he turns out to be an excellent pilot]].
* WillTheyOrWontThey: With China. But as it turns out in the [[https://www.youtube.com/watch?v=7X273gZ0jDA Blu-Ray edition extra scene]], TheyDo.
* WingdingEyes: Gets yellow 4 point stars in his eyes whenever he talking about Gundam lore or Gunpla. Seems to run in the family, as both his parents do the same when excited.

->Voiced by: Sachi Kokuryu

->Main Gunpla: [=GAT-X105B=] Build Strike Gundam, [=RX-178B=] Build Gundam Mk-II, [=GAT-X105B/ST=] Star Build Strike Gundam, [=GPB-X80=] Beginning Gundam, [=BG-011S=] Star Burning Gundam

A mysterious boy with an innate talent for Gunpla Battling. After a fateful encounter with Sei, the two of them quickly become friends and partners. However, he doesn't appear to be entirely of this world...
* AudienceSurrogate: Most info about Japanese pop culture / customs / Gundams / etc. gets directed at him, since he's a FishOutOfWater and all.
* BabiesEverAfter: [[spoiler: At the end of the Island Wars OVA. Although he isn't seen, he is clearly alluded to have sired one with Aila.]]
* BackToBackBadasses: With [[spoiler:Aila's Command Gundam]] while piloting his Beginning Gundam in episode 16.
* BelligerentSexualTension: With Alia.
* BigEater: To the point where he ducks out on a black-tie party to mow through a sports tournament's worth of snack stalls.
* BrutalHonesty: This kid can't keep his mouth shut to save his life.
* TheBusCameBack: [[spoiler:After many thought Reiji never returned to meet up with Sei in ''Try'', it turns out he ''had'' come back in ''GM's Counterattack''. He even has his promised fight with Sei!]]
* ButNowIMustGo: In the finale [[spoiler:the Arista crystal on his bracelet breaks, forcing him to go back to Arian.]]
* CassandraTruth: Sei does not believe him when he [[spoiler: claims to be the prince of Arian, a country in a far off world.]] However, later events reveal that he ''was telling the truth'', and also shows that [[spoiler: Arian has connections to PPSE and the origins of the Plavsky Particles.]]
* ChasteHero: While Sei is shy and awkward, Reiji is downright ''dense''. This is exploited for all it's worth in his interactions with [[{{Tsundere}} Aila]].
* FieryRedhead: Definitely qualifies as this when behind the controls; and even outside of battling, if his first encounter with Aila is to be considered.
* FishOutOfWater: He's doesn't appear to be from this Earth, having no idea what a school is or how outdoor shops work. [[spoiler:This is because he's the prince from an alien planet.]]
* GivenNameReveal: Through [[spoiler:Chairman Mashita's FreakOut]] in Episode 21, his true name was revealed (at least to the viewers) as [[spoiler:Aria von Reiji Asuna]].
* GracefulLoser: [[spoiler:In episode 6, he finally gets his long-awaited battle against Yuuki...and ''BARELY'' loses. However, he's pretty cool about it, mainly because they put everything they had into the fight and so there's nothing to regret; Yuuki was just the better pilot.]]
* HotBlooded: Rivals Tatsuya for sheer intensity during Gunpla Battling.
* InstantExpert: During his first ever Gunpla Battle, he demonstrates incredible piloting skills and easily destroys Sazaki's Gyan.
** Averted in regards to actually ''building'' Gunpla; it takes a lesson from [[spoiler:Sei's father Takeshi]] to give him the skills to do so.
* ItsPersonal: He explicitly states that he has no interest in Gunpla Battling until Yuuki defeats him in combat; Sei himself even notes that all Reiji cares about is revenge against Yuuki. Over time though, he's grown to enjoy how much fun Gunpla Battle can be.
* JerkWithAHeartOfGold: Can come off as extremely harsh at first glance, but that's mainly due to his absolute lack of any form of tact. When you get to know him better, you'll find that he's a rather friendly guy.
* LeeroyJenkins: His signature opening. So bad that during the Battle Royal, his 'tactic' of recklessly charging enemies results in the Star Build's absorption shield being taken out of action during the opening minutes.
* MoeAnthropomorphism: Played with. His color scheme, along with the design of his clothes (especially the neckline of his red vest), evoke a cute kid version of Zeon mecha designs from the UC continuity in ''Gundam''.
* MysteriousStranger: Very little about his origin is clear when we first meet him, and the story he feeds Sei comes off as BlatantLies. [[spoiler:Turns out it was the truth after all.]]
* ObliviousToLove: Due to his denseness, he has absolutely no idea that Alia is in love with him. He just thinks she's weird.
* OfficialCouple: At the end of Episode 21, [[spoiler:he and Aila become this, notwithstanding the fact that he still did not get why she came to him at Arian in the final episode. Fortunately, this is cemented in the ''Island Wars'' OVA as it's revealed that he and Aila are raising their daughter in Arian.]]
* PrettyFreeloaders: Moves in with Sei after the first episode. At first, Sei is pretty annoyed by this, but later relents when Reiji agrees to become his Gunpla fighter.
* RedOniBlueOni: The red to Sei's Blue.
* RebelPrince: He seem much happier adventuring on a [[spoiler:foreign planet]] than staying in his kingdom.
* RequisiteRoyalRegalia: The gem fitted on his trademark golden bracelet denotes him as the [[spoiler:Prince of Arian.]]
* RoyalsWhoActuallyDoSomething: He's always ready to help out anyone in trouble, [[spoiler:despite being the prince of Arian.]]
* SoreLoser: [[SubvertedTrope Subverted]]. While he ''was'' bitter [[spoiler:after his initial loss to Yuuki, that was only because he was annoyed with how the latter showed up out of nowhere then essentially left the battle unfinished. As mentioned above, once he had a proper battle with him, he was far more satisfied with the outcome, despite still losing]].
* SupernaturalGoldEyes: They officially fall into this trope after he's outed as [[spoiler:the [[HumanAliens Crown Prince of Arian.]]]]
* UnskilledButStrong: As Nils observed, Reiji has innate piloting skills and possesses a very powerful Gunpla, but is still very inexperienced at Gunpla battling as a whole. Thus he depends on Sei to plan out most of his battle tactics.
* WarriorPrince: [[spoiler:Reiji's the crown prince of Arian, extremely competent in gunpla battles, and capable of knocking out an entourage of bodyguards single-handedly.]]
* WillTheyOrWontThey: With Aila. [[spoiler:In the end of Episode 21, TheyDo in the most hilarious, heartwarming, and spectacular way possible. At the end of Episode 25, she goes with him to Arian. In the ''Island Wars'' OVA, it's revealed that he and Aila have a daughter.]]
* TheWorfEffect: Gets hit with this in Episode 20 when he tries to intervene [[spoiler:a berserk Aila's NoHoldsBarredBeatdown on Ricardo's Fenice]] with his Beginning Gundam. With a few swipes from [[spoiler:Aila's spear]], Reiji's Gunpla is shattered to pieces.
* WorfHadTheFlu: He was piloting an unmodded standard kit that lacked the build quality and special features the [[AceCustom Star Build Strike]] has.

[[folder:China Kousaka]]

->Voiced by: [[Creator/YuiIshikawa Yui Ishikawa]]
->Main Gunpla: KUMA-03 Bearguy III(san)

Sei's classmate and class representative. Sei's fascination with Gunpla (and her fascination with Sei) ends up sparking her own interest in the hobby, which eventually leads her to become a Gunpla battler herself.
* AudienceSurrogate: She knows very little about Gunpla, making her one of the main targets for in-show explanations about ''Gundam'' models and TV series.
* ApologeticAttacker: In the final episode, she almost frantically apologizes for cutting down her enemies, even with them being MechaMooks.
* BadassAdorable: Her Bearguy once it's in action.
* BearsAreBadNews: [[LaserBlade Beam saber emitters]] in its rounded arms along with the default beam guns, and Bearguy III is more than capable of making angry expression.
* BearyFriendly: Her custom Acguy, Bearguy, looks like a cute teddy bear.
* BigDamnHeroes: Saves Nils at the last second during ''GM's Counterattack''.
* ClassRepresentative: She's the rep of Sei's class at school.
* CrushBlush: Exhibited this when being egged on about Sei. Particularly if it's done by Sei's own mom.
** Escalates into LuminescentBlush territory, particularly in episode 16 [[spoiler:after having declared that she would personally cheer him on while he rebuilds his heavily-damaged Star Build Strike.]]
* ColorFailure: With Sei and his mother, upon seeing [[spoiler:Aila in a ModestyTowel]] in episode 22.
* CuteMachines: The Acguy mobile suit was already considered somewhat adorable by fans. Adding teddy bear motifs just makes the robot cuter.
* DistaffCounterpart: To Sei. China's not necessarily the most experienced or talented fighter, but she proves herself to be a creative builder with her Bearguy III, such as stuffing it with cotton or utilizing a mask that can change expressions when under Plavsky particles.
* ExpressiveMask: Her model robot has a bear mask for a head. However, the eyes on this robotic mask can change into various expressions, like angry or sad, when under the Plavsky particles.
* GiantWaistRibbon: Her Bearguy has a big red ribbon for a backpack. According to the model, it's actually a ''[[Anime/MobileSuitGundamSEED SEED]]''-style Striker Pack, which means the Bearguy can potentially use any Strikers -- maybe even the Universal Booster!
* GuysSmashGirlsShoot: Shown to be a crack shot in the match against Nobel Gundam.
* ImprobableWeaponUser: Her Bearguy can use cotton as a weapon. For bonus points, China had no intention to use it as such; she simply stuffed too much inside.
* MadeOfRubber: The first sign that the Beargguy may be stuffed with too much cotton - it can roll out of a spill by ''bouncing off its own head.''
* {{Meganekko}}: Wears a pair of glasses.
* NiceGirl: Is friendly and polite to just about everyone she meets, including her self-proclaimed rival Caroline Yajima.
* PinkMeansFeminine: Wears a pink top for most of the series.
* RedOniBlueOni: The blue to Aila's red.
* ScaryShinyGlasses: Her glasses turn pure, spooky white when she becomes distraught over [[ClingyJealousGirl Sei's apparent interest in Kirara]]. It happens by default in her family store as well, which weirds out the customers.
* TaremeEyes: Indicates her friendly, {{Adorkable}} personality quite well.
* TookALevelInBadass: ''GM's Counterattack'' has her pulling a BigDamnHeroes ''and'' a BondOneLiner!
-->'''GM:''' A bear...?\\
'''China:''' [[TheyCallMeMisterTibbs It's Beargguy-san!]]
* TheUnSmile: The result of her father asking her to be a bit friendlier to the customers. He then tells her to be herself, ScaryShinyGlasses and all.
* WillTheyOrWontThey: With Sei. But as it turns out in the [[https://www.youtube.com/watch?v=7X273gZ0jDA Blu-Ray edition extra scene]], TheyDo.
* ZettaiRyouiki: Grade A. All her clothes have a short skirt and stockings, leaving only a thin strip of skin on her thighs visible.

[[folder:Tatsuya Yuuki]]
[[caption-width-right:178:[[labelnote:click here]]http://static.tvtropes.org/pmwiki/pub/images/yuki_b_8395.png[[/labelnote]] to see him in Gunpla Battle mode]]

->Voiced by Creator/TakuyaSato

->Main Gunpla (TV series): MS-06R-AB Zaku Amazing, PPMS-18E Kämpfer Amazing, PPGN-001 Gundam Amazing Exia, PPGN-001/DM Gundam Exia Dark Matter,PPGN-001R Gundam Amazing Exia Repair, MSM-07-A Amazing Z'Gok

->Main Gunpla ({{Prequel}} manga[[note]]''Gundam Build Fighters: Amazing''[[/note]]): RX-93-B Nu Gundam Brave, RMS-116H-B Hobby Hizack Brave, RX-93-ν2-B Hi-Nu Gundam Brave

StudentCouncilPresident at Sei's school and Sei and Reiji's first major rival in Gunpla Battles. While he entered the same Gunpla qualifiers as Sei and Reiji (in order to get a chance to duel them in Gunpla Battle) he quickly backed out before their fated match...
* TheAce: Already qualified for the previous year's word championships by the start of the series.
* BadassLongcoat: As Meijin Kawaguchi III.
* BadassNormal: The only one of the recurring rivals to not manipulate Plavsky Particles, instead relying on a high speed low drag gunpla, accurate gunplay and close combat skills.
* BecomingTheMask: Defied. [[spoiler: The alias of Meijin was given a negative look ever since the second Meijin, who was extremely ruthless and only cared about winning. Not only does Yuuki still care about Gunpla but he deliberately took the alias of Meijin to remove the negative outlook on it]].
* BloodKnight: Says himself that he wants a good Gunpla battle while wondering if he's being arrogant.
** Averted as of Episode 22; the second Meijin had this kind of attitude, and Yuuki explicitly rejects it, saying that he wants Gunpla Battle to be fun and make people happy. Specifically, it's hinted at that his predecessor was notoriously brutal and ruthless, without care for how much damage was inflicted to his opponent's Gunpla, ignoring the amount of time and effort went into building the models in the first place. Yuuki on the other hand, understands the care builders put into their models and indeed enjoys facing opponents that rival his skill level where he can push the abilities of his Gunpla to the limit, but he hates causing unnecessary damage to either his opponent or his own models. [[spoiler:He's absolutely ashamed of how he was forced to fight while under the influence of the Arista empowered EMBODY system, under Chairman Mashita's control.]]
* BrainwashedAndCrazy: [[spoiler: During Episode 23, after the improved Embody System is forced upon him by Chairman Mashita]].
* CerebusRetcon: Downplayed, but the prologue manga reveals that his utter passion for it all stems in part from his childhood. Or rather, a ''lack of it'' as a rigidly groomed boy until being introduced to Gunpla.
* CharClone:
** Initially uses a customized version of Char's Zaku II from ''Anime/MobileSuitGundam''. He even has the nickname ''Crimson Comet'', a play on Char's ''Red Comet'' moniker. That nickname is also a reference to a CharClone from the VideoGame/SuperRobotWars series (Sleigh Prestly), who uses the same moniker but with a different translation (They're both 紅彗星, but in Sleigh's case, it's translated as "Scarlet Comet").
** Gets a pair of CoolShades similar to [[Anime/MobileSuitZetaGundam Quattro Bajeena's]] after taking the alias [[spoiler:Meijin Kawaguchi]].
* CompositeCharacter: The Amazing Z'Gok combines the armaments of the Zogok, Juaggu and Agguy all loaded in its arms.
* GunsAkimbo: His suits are usually fitted with a pair of pistols in addition to their other weapons, for whenever he wants to John Woo a fight up a little.
* GunFu: Happens whenever one of his suits whips out a pair of pistols. Which is often.
* HonorBeforeReason: During the Battle Royale [[spoiler:he gets ordered to ignore the Mega Zaku attacking Sei and Reiji. Instead he helps in secret by sniping the Zaku's foot, then chews out Chairman Mashita for his blatant cheating.]]
* HotBlooded: Is incredibly passionate when it comes to Gunpla Battling.
-->'''Yuki:''' Burn brighter! And brighter! And brighter! Gunplaaaa!! (''He [[MythologyGag quotes]] the [[Anime/MobileSuitGundam original Gundam theme song]].'')
** This is lampshaded by his leitmotif, "The Crimson Comet - Three Times the Passion of an Ordinary Flamenco." And then there's his leitmotif as Meijin: "Meijin - ''Six'' Times the Passion of an Ordinary Flamenco."
* JumpedAtTheCall: Downplayed. He's reluctant at first to take on the identity of Meijin Kawaguchi, and almost seems [[ResignedToTheCall resigned after he aces the selection]], but after a no-holds barred Gunpla Battle with Sei and Reiji at the school gym, he fully embraces the role of being Meijin Kawaguchi the Third.
* KineticWeaponsAreJustBetter: Unusually for this franchise, the Zaku Amazing exclusively uses these rather than the conventional EnergyWeapons. As for the 'just better' bit, it's one of the deadliest machines in the sport. Eventually subverted when he joins PPSE and starts getting even better suits, at which point we get to see what he can do with beam weaponry. Spoilers - it puts the Zaku Amazing's performance to shame.
* KnifeNut: The Zaku Amazing uses a pair of vicious-looking heat machetes in close combat rather than the typical {{Laser Blade}}s or the iconic [[AnAxeToGrind Heat Hawk]]. The Kämpfer Amazing uses actual heat [[KukrisAreKool khukris]].
* LegacyCharacter: His CharClone moniker is Meijin Kawaguchi III, after the real-life Gunpla building expert. Yuuki got roped in to replace Meijin Kawaguchi II, who fell ill and was unable to participate in the Gunpla Battle World Championship.
* LargeHam: His Meijin role literally requires it as part of the character image. While he's capable of hamminess of his own accord, he finds the constant bombast when he's on the clock a bit tiring.
-->'''Tatsuya''': Burn {{red|OnesGoFaster}}, Exia! '''TRANS-AM!'''
* LightningBruiser: The Zaku Amazing is noted to be surprisingly fast for a heavily armored and armed Zaku (the heaviest of the Build Fighters original mechs, in fact) and having enough strength to crush a large caliber beam rifle with its fingers. It's probably the [[LawOfChromaticSuperiority Char colors]].
** His Kämpfer Amazing as well, unlike the GlassCannon that it was during ''[[Anime/MobileSuitGundam0080WarInThePocket War in the Pocket]]''.
*** And then there's the [[Anime/MobileSuitGundam00 Amazing Exia]]. [[spoiler:Which happens to be the incomplete Exia Dark Matter.]]
* ManInWhite: His [[spoiler:PPSE]] uniform, which is only visible after he sheds his [[spoiler: Meijin]] garb.
* MidSeasonUpgrade: Upgrades from his Zaku Amazing to a customized dark blue [[Anime/MobileSuitGundam0080WarInThePocket Kämpfer]] Amazing in episode 7. Then upgrades to the Amazing Exia in Episode 22. [[spoiler: Then upgrades to the Exia Dark Matter the following episode]].
* MrFanservice: There's that long pan of him in very tight clothes while working out at the gym in Episode 15...
* MultiRangedMaster: The Kämpfer Amazing's Binders usually carry one or two weapons which the suit can use with deadly efficiency. The Binders can currently hold one or two of the follow: beam pistols, beam sub machine gun, a long rifle, a beam rifle, a missile launcher, and a [[GatlingGood gatling gun]].
* NiceGuy: Despite being Sei's rival, he's very friendly and admires Sei's model-building skills, and even expresses an interest in having him join the school's modeling club. He also does his best to avoid damaging his opponents' Gunplas out of respect for the time and effort they put into creating them.
** [[spoiler: He also dons the Meijin name specifically to change its image from that of a JerkAss who only seeks victory to someone who loves Gunpla because it's fun and makes people happy.]]
* OlderIsBetter:
** His first model is based on a mobile suit from the original ''Anime/MobileSuitGundam'' series, uses primitive kinetic weaponry rather than beams, and is even customized with reactive armor from model tanks.
** Kämpfer Amazing also has kinetic weapon options for its weapon binders, like a slug firing Gatling gun or 4 tube missile launcher.
* PaperThinDisguise: His [[spoiler: Meijin Kawaguchi]] disguise is just a pair of sunglasses and a coat. Sei and Reiji are not fooled in the slightest.
** In Episode 23, he doesn't even bother hiding it; while at the Shizuoka festival, Reiji asks why he's not in the outfit, and Yuuki admits that the heavy jacket wears on his shoulders.
* PunnyName: Amazing when said with a Japanese accent sounds very similar to Meijin. Lampshaded for laughs in one of the "tweets" regarding him before his match with the Renato bros.:
-->'''Random "tweet":''' Is the Kämpfer Amazing because he's [[IncrediblyLamePun a Meijin]]?
* RedAndBlackAndEvilAllOver: Although he is not evil he does wear a sinister looking red and black uniform during the final match of the Tournament [[spoiler: due to being BrainwashedAndCrazy by the Embody system. The Exia Dark Matter also has the Exia's normal blue and white colors switched to red and black, giving it a very menacing look]].
* RedOniBlueOni: To ''himself'', switching between a laid-back builder and a hotblooded fighter. The color schemes of his various gunpla reflect this, as he switches back and forth between red and blue machines throughout the franchise.
* TheRival: Serves as Sei and Reiji's first major opponent in Gunpla Battles.
* SimpleYetAwesome: The Kämpfer Amazing is shockingly no-frills for a top-tier Gunpla. It doesn't have a WaveMotionGun, it's not a TransformingMecha, and it doesn't have a gimmick making clever use of Plavsky Particles to give it an edge. It's just a superbly-engineered, high-performance suit with ergonomic weapon storage that gives it a tool for every conceivable job.
* SinisterShades: Wears a pair in his [[spoiler:Meijin Kawaguchi]] persona.
** [[spoiler: Episode 23's stinger reveals a set of SinisterShades bearing a [[BrainwashedAndCrazy foreboding orange glow]]…]]
* SplitPersonalityMakeover: PlayedForLaughs. While normally laid back, he slicks his hair back whenever he reveals his HotBlooded side during Gunpla battles.
* StudentCouncilPresident: Of Seiho Academy. Also ClubPresident of its model kit club. [[spoiler:To which, when he assumed the Meijin title, he candidly denies. (See below.)]]
* SuspiciouslySpecificDenial: [[spoiler: When confronted over his identity as Meijin, he claims that he is not the former student council president of Seiho Academy, or the former Captain of their model-building club. [[LampshadeHanging His impeccable knowledge of the person he supposedly isn't does not go unnoticed.]]]]
* ThatManIsDead: [[spoiler: After taking on the title of Meijin Kawaguchi, he boldly proclaims that he is no longer Yuuki Tatsuya, nor was he ever a student at Seiho Academy. The trope is somewhat subverted, however, as this turns out to be merely a persona he puts on when in the presence of others. Also, Sei and Reiji don't fall for it.]]
* WalkingArmory: The Kämpfer Amazing's detachable Amazing Weapon Binders contain... well, an amazing amount of weaponry, like CoolGuns/{{handguns}}, CoolGuns/{{submachineguns}}, {{sniper rifle}}s, [[GatlingGood gatling guns]], and [[CoolGuns/RocketsMissilesAndGrenadeLaunchers rocket launchers]]. This makes it one of the most versatile suits in the sport. Thanks to a clever engineering decision by PPSE, it also avoids the LogicalWeakness that plagues most walking armories - the Binders contain additional thrusters, meaning they enhance the Kämpfer's speed and manoeuvrability rather than reducing it.

!Main rivals

[[folder:Ricardo Fellini]]

->Voiced by: Creator/YuuichiNakamura

->Main Gunpla: XXXG-01WF Wing Gundam Fenice, Wing Gundam Fenice Rinascita, XXXG-01Wfl Gundam Fenice Liberta

An Italian gunpla fighter and an infamous casanova. Despite his sometimes less than adult behavior, he is a very competent fighter and builder.
* BetaCouple: With Kirara by Episode 15.
* {{BFG}}: His Gundam's main long range weapon is a Buster Rifle that can wipe out a dozen enemies in a single shot.
* BifurcatedWeapon: The buster rifle has a standard beam rifle mounted underneath [[GunsAkimbo and the two can be used independently]].
* BigOMG: See entry under GratuitousItalian.
* BunnyEarsLawyer: For all his skills and reputation, deep down he's shown to be a very enthusiastic Gundam fanboy. At one point even drunkenly praising how awesome the latest ''08th MS Team'' short is.
* CombatPragmatist: While not a dirty fighter, he WILL use nearly any means to win.
* CoolBike: The mobile vehicle the Fenice uses resembles one. [[spoiler:As does the Fenice Liberta in ''GM's Counterattack''.]]
** He also rides a pretty snappy looking Vespa.
* CrouchingMoronHiddenBadass: He might be a bit of dorkish idiot and CasanovaWannabe IRL but his opponents know to never underestimate him in battle. There's a reason he's Italy's champion.
* CantHoldHisLiquor: Which does nothing to help with his CasanovaWannabe problem.
* CasanovaWannabe: A variant. He does manage to attract women, but only for about ten seconds apiece before ruining his chances completely. His record seems to be pretty good ''off''screen though.
* TheCharmer: How does he hit on ladies? By giving them a Gunpla and comparing it to them.
* ChickMagnet: Has caused so many women to leave their boyfriends that the latter have formed a coalition to defeat him! And he claims that every one of said women came to him.
* DeflectorShields: The Fenice's left shoulder is equipped with a "Beam Mantle" instead of a physical shield.
* {{Determinator}}: As Episode 15 shows, when Ricardo Fellini decides to fight for real, he will go all out, no matter how bad the odds.
** Episode 20 just adds to it: during the closing stages of his match against Aila, he knew that his Fenice could not handle the beating even if he could. So he decides to give Fenice a massive send-off by having it latch on to Qubeley Papillon's spear, then activating the Self-Detonation device; his actions caused genuine ''panic'' on Team Nemesis.
* FashionableAsymmetry: His Wing Gundam Fenice is much fancier on its left side than its right. Purposely done according to the HG manual. [[spoiler: Does away with this after rebuilding it as the Rinascita.]]
* FriendlyRival: His relationship with Greco. Made even more symbolic with the latter preferring the Tallgeese.
** Falls into this dynamic with Sei and Reiji as well, especially after the events of episode 15.
* GratuitousItalian: Will randomly break into his native Italian, despite being fully fluent in Japanese.
-->'''Ricardo:''' [[BigOMG Oh dio mio!]]
** It becomes ridiculous when he combines this with GratuitousEnglish. "Grazie, Samurai Boy" anyone?
** Calls girls "señorita", [[AsLongAsItSoundsForeign which is actually Spanish, not Italian.]] Though it may be a case of Fellini himself doesn't care as long as it gets him a girl.
* LatinLover: A subversion. He's got the looks and the superficial charm, and he ''does'' try, but he's dreadful at the follow-through once he gets a girl's attention.
* LuminescentBlush: The [[spoiler: Gundam Fenice Rinascita]] gets one when Kirara's Gerbera Tetra glomps it in Episode 23. [[LampshadeHanging Lampshaded]] by animation director Masami Obari on Twitter, where he said "Even though I know they're just Gunpla, now I have to live with having added blush marks to a Mobile Suit for the rest of my life..."
* MentorArchetype: For Reiji, who he helps train to become a better Gunpla battler.
* MeaningfulName: Surprisingly, Fenice (meaning Phoenix) does not refer to the transformation sequence, as Fellini had ignored the gimmick. The name instead referred to the fact that he kept rebuilding it even after losses.
** Also, [[spoiler: Gundam Fenice Rinascita, Italian for "reawakening" or "reborn", after he rebuilds Fenice into its new form. Also a little lampshade hanging of a LawyerFriendlyCameo, given that Rinascita is essentially Fenice with strong Reborns Gundam influences.]]
* RedBaron: "The Italian Dandy."
* ScarsAreForever: Not on him, but on his Wing Gundam Fenice. It has noticeable damage on its head and its left shoulder armor is missing. He could've fixed them at any time but decides not to, as they are proof of the long history of battles he and his prized gunpla had gone through.
* ShoulderCannon: The Fenice has a large beam gun built into its right pauldron.
* SoreLoser: After getting defeated by [[spoiler:Aila]], he prepares to deliver a last 'screw you' by activating the Fenice's self-destruct system, only for [[spoiler:Mihoshi]] to loudly and emphatically point out that he'd be irreparably damaging one of his most prized possessions in a manoeuvre that would be unlikely to even force a draw. He realises he's falling into this trope and stands down.
%%* TallDarkAndHandsome
* TakingYouWithMe: Attempted to use Fenice's Self-Detonation device during its losing battle against Qubeley Papillon. [[spoiler:Kirara]] apparently calls him out of it.
* TransformingMecha: [[SubvertedTrope Subverted]]. Fellini ignores the Wing Gundam's transformation gimmick, using the extra parts to build his [[CoolBike Meteor Hopper]]. [[spoiler:Until it's rebuilt as the Fenice Rinascita, then later on as the Fenice Liberta.]]
* WeakButSkilled: As Nils points out, his machine doesn't perform as well as newer Gunpla like the Star Build Strike. However he more than compensates for the performance gap with his experience and tactics.
* WhenAllYouHaveIsAHammer: He has used the same Gunpla model that he had as a child, only repairing and modifying it over the years. It's no wonder that he refers to it as [[CompanionCube "partner."]]
* WorthyOpponent: How he and Reiji regard each other.
* WouldntHitAGirl: Averted in his fight with Aila, but seemingly played straight in Episode 23 with his free battle against Kirara.
* YouthfulFreckles: Flashbacks in episode 15 shows he used to have them.

[[folder:Mao Yasaka]]

->Voiced by: Minami Fujii

->Main Gunpla: GX-9999 Gundam X Maoh, XM-X9999 Crossbone Gundam Maoh, GX-9999-J Gundam X Jumaoh

A fellow Gunpla Builder like Sei from Kyoto. He once sought to be accepted in the prestigious Gunpla Shingyo School, but was refused because the master of the said school told him that even a master like him once feared another man, that being Sei's father.
* BunnyEarsLawyer: The kid is an '''amazing''' model-builder, but he apparently thinks he can pay for goods and services with his models.[[note]]And no, it's not egotism[[/note]]
* CampStraight: More or less a screaming fangirl in a boy's body, whether it's about Gunpla, or as revealed in Episode 7, his actual love interest.
* ChestBlaster: The abdomen-mounted [[spoiler:Satellite Cannon on the Crossbone Maoh, hidden behind the giant skull's mouth.]]
* CoolHat: Wears one with an X mark (see pic, and XMakesAnythingCool entry)
* {{Cosplay}}: Mao imagines himself dressed as [[Anime/AfterWarGundamX Garrod Ran]] during his imagination fight with Sei and Build Strike.
* DistractedByTheSexy: In the ''GM's Counterattack'' OVA, he falls victim to this [[spoiler: when facing a [[{{Stripperific}} shameless]] and [[GagBoobs rather well-endowed]] female opponent who catches him off guard by flaunting her goods. He ultimately pulls through, though, as detailed below in ThePowerOfLove.]]
* TheEngineer: Sei even admits that Mao is a better modeler than him.
** Builds an [[VideoGame/GundamVsSeries Extreme Gundam]] model ''while'' eating lunch. Sei also gushes over how well it was constructed.
** Builds a [[Anime/MobileSuitGundamUnicorn Kshatriya]] of similarly high quality, while in a moving truck.
** Builds a custom Crossbone Gundam in one afternoon. Note that this is including assembly '''and''' the custom parts!
* EyesAlwaysShut: Usually.
* FanDisillusionment: Think highly of Fellini at first, then sees his ''appalling'' [[CasanovaWannabe drunken PUA skills]]. His hangover the next day doesn't help much either.
* GivingSomeoneThePointerFinger: While declaring that he had gotten over [[spoiler:his angst from his loss against Sei and Reiji]].
* HeirToTheDojo: Seeks to become the heir to Gunpla Shingyo school.
* {{Keet}}: One of, if not the shortest in the cast, and a rather hyperactive one when not in serious mode. Look no further than the time that he first met Sei.
* TheIdiotFromOsaka: The comedic, goofy variety, as he's definitely not an idiot. He speaks with a heavy accent.
* LargeHam: He introduces himself like he's a Saturday morning cartoon superhero. Both Sei and China are embarrassed enough to try to leave. Mao then says he'll do the short version, and does the entire speech ''again'', only faster.
-->'''Mao:''' I've finally met you, Sei Iori! My life long rival!
* LikesOlderWomen[=/=]PrecociousCrush: He has a rather obvious crush on an older girl who works at an inn.
* LoopholeAbuse: In the third round of World Tournament, where everyone is only allowed to a weapon that is chosen at random, he ends up with a rather useless paint gun while his opponent gets a massive hammer. As he gleefully points out after the fact, the rules never said they couldn't steal the opponent's weapon and use it against them.
* ThePowerOfLove: PlayedForLaughs in ''GM's Counterattack''. [[spoiler: One of the Gundam Mafia's agents is a DarkChick with GagBoobs who fights in a bikini and relies on seduction to keep her opponent in check. Mao can't lay a finger on her until he imagines Misaki being disappointed in him, at which point he belts out [[AnguishedDeclarationOfLove that she's the only one for him]] before obliterating his opponent with his biggest WaveMotionGun yet. The beam's even has words on it that read ''"Misaki is my life"'' when translated.]]
* TheRival: For Sei in Gunpla building.
* ThemeNaming: His two Gunplas both have X[[labelnote:Note]]Although in the Crossbone Maoh's case, the "Cross" part serves as the "X" bit[[/labelnote]] and "Maoh" on their names.
* VillainForgotToLevelGrind: When first introduced, Mao was a builder at or above Sei's level, and Gundam X Maoh was superior to Build Strike. By the time they fight in the World Tournament, Sei had rebuilt Build Strike several times, which left Mao at a distinct disadvantage. [[spoiler: He fixes this with the Crossbone Maoh]].
* WaveMotionGun: The Gundam X Maoh features an upgraded version of the original Gundam X's Satellite Cannon that does not need to be charged by the Microwave Laser. [[spoiler: The Crossbone Gundam Maoh has a similar cannon hidden inside the skull on its chest. Similarly, the Gundam X [=JuuMaoh=] is packing ''[[UpToEleven Four Satellite Cannons]]'' and [[BeamSpam multiple output ports all over it's body]]. All these things combine to form a WaveMotionGun that fires a beam the size of a Space Colony.]]
* TheWorfEffect: In episode 22, he is annihilated effortlessly and off-screen by the newly-arrived [[spoiler: Julian Mackenzie and his F91 Imagine.]]
* XMakesAnythingCool: The mark on his hat, and both his main Gunpla[[labelnote:Note]]Although in the Crossbone Maoh's case, the "Cross" part serves as the "X" bit of the trope[[/labelnote]].
* YinYangBomb: In episode 17, the Gundam X Maoh is customized to be powered by both the solar panels on its wings alongside the traditional Satellite System on the moon. [[spoiler:Both are used simultaneously to power its ultimate weapon, the Maoh Sword.]]

[[folder:Nils Nielsen]]

->Voiced by: Creator/ShinnosukeTachibana

->Main Gunpla: 侍ノ弐 Sengoku Astray Gundam, 忍ノ参 Ninpulse Gundam

A Gunpla Fighter from America who was known as the "Early Genius" for earning his three Ph.D degrees at a very young age. He entered the Gunpla World Tournament to obtain information on Plavsky Particles.
* AlliterativeName: His first and last names both start with a ''Ni-''.
* AbsurdlySharpBlade: Sengoku Astray's swords can cut through beam sabers.
* AnimeHair: The first major remold on the Ninpulse Gundam sees the back of its head turned into a massive point just to invoke this.
* AwesomenessByAnalysis: He incorporates both scientific and tactical information to dominate his opponents. Case in point, his gundpla can gut through beams with its katana by synchronizing the katana's anti-beam wavelength with the opposing beam's wavelength, thus cancelling each other out. Note that he does this in the middle of a match.
* BadassBookworm: He may be a small nerdy little dude, but above his potent martial-arts skills he uses his brain power to fight. Leading to some of the best gunpla kill moments, as he analyzes and dissects his opponent piece by piece, and even in one case manages to hang them by the neck with a Yo-Yo.
* BecomingTheMask: He initially viewed Gunpla and the tournament as a means to further his goals, but during his battle [[spoiler: with Sei and Reiji]] he truly gains a passion for it.
-->'''Nils''': The next time we battle, I'll definitely win!
* BerserkButton: [[spoiler: Reiji and Sei]] managing to deal heavy damage to his favorite Astray proved to be the last step for him finally admitting to liking Gunpla. He loses his composure (even shaking with rage while fixing it) and goes full HotBlooded in the ensuing second round.
* BlackAndNerdy: He's African American, has 3 scientific doctorates, and an obsession with Samurai culture.
* BladeBelowTheShoulder: Ninpulse Gundam has the beam blade variant.
* TheComicallySerious: Being the most strait-laced member of the main cast doesn't work out too well when you're in a series as goofy as Build Fighters.
* ColorFailure: In Episode 19, when Caroline starts calling him her boyfriend.
-->'''Nils''': Boyfriend?! Am I the Boyfriend?!
* CombatPragmatist: His goal is to get far enough into the tourney to research the Plavsky Particles, and nothing else, and thus takes the safe route through the matches. During the battle royale, he notes that the only objective is to ''survive'' the match, not defeat others, so he spends most of the battle hunkering down and letting the more HotBlooded players thin themselves out. [[spoiler: In episode 19, he even meets with Sei and Reiji to suggest he lose to them on purpose. Sei was having none of it]].
* ChromeChampion: His suits all incorporate metallic paint, like his gold plated Hyaku Shiki, or the silver plated Knight Gundam he makes for Caroline. Even his Sengoku Astray uses chrome red for its highlights.
* DefeatEqualsFriendship: Becomes noticeably more relaxed and friendly after Episode 19, and joins Mao in hanging out with Sei and Reiji in-between matches.
* DualWielding: His Sengoku Astray can wield two Katanas via its shoulder arms, while its actual arms are focused on using Fa Jin.
* ForScience: Enters the World Championship Tournament after discovering Plavsky Particle creation has wider reaching scientific applications. It's all just so he can find out why they aren't being used for science.
* FuumaShuriken: That apparently cumbersome backpack array on the Ninpulse Gundam turns into a HUGE one.
* GratuitousJapanese: The Sengoku Astray's "model number" is 侍ノ弐, (Samurai no Ni), which literally means "Samurai's 2nd". Carried over into the Ninpulse as "Samurai's 3rd."
* IAmNotLeftHanded: If you think the Sengoku Astray will be helpless without its katanas, then prepare to be crushed with a single palm strike [[spoiler: infused with Plavsky particles]].
* ImprobableAge: He's only 13 and already has three scientific doctorates.
* InSeriesNickname: Early Genius and Samurai Boy; the latter doubles as his RedBaron name during the tournament.
* MultiArmedAndDangerous: The large shoulder pauldrons on the Sengoku are capable of moving separately to the shoulders and gripping its swords on their own, allowing it to invoke IAmNotLeftHanded by maintaining a BadassArmFold while chopping you to death with its shoulders until Nils feels like it's time to use his Gunpla's actual hands.
* {{Ninja}}: Literally becomes one whenever he wants to spy on PPSE's affairs.
** His yo-yo technique during the Battle Weapon fight is a shout out to a TV drama about an Edo-era assassin (aka Ninja).
** Averted when he actually does infiltrate the Plavsky Particle production plant. That sword really would have come in handy.
** The Ninpulse Gundam takes all this to their logical conclusion.
* NotSoAboveItAll: He has zero tolerance to weirdness that happens InUniverse and often stumbles speechless, such as [[RuleOfFunny the fact that Plavsky particles react to cotton]] or [[spoiler: Caroline declaring him as her boyfriend]].
** Also around the time of his match with Sei and Reiji, [[spoiler: he becomes much more passionate about his Gunpla and battling, such as taking offense that Sei and Reiji broke his Sengoku Astray's arms during their fight and immediately looking forward to another battle with them after their match.]]
* {{Otaku}}: For Samurai discipline in general. His signature pose is even the "Samurai Hello" and his custom Astray is based on various Samurai armors. Humorously, despite all the Samurai influence, the fighting techniques he uses are actually Chinese in origin, and the Japanese cast points out how ill-fitting this is for his design.
* RetiredBadass: While he was retired from Gunpla Battling during ''Try'', Nils actually officially retired prior to the events of ''GM's Counterattack''. He only came out of it when the Yajima Stadium was taken over by the Gunpla Mafia and proves he still has the moves.
* ShoutOut: A subtle shout out to [[https://en.wikipedia.org/wiki/Nils_Nilsson_%28researcher%29 Nils Nilsson]], a renowned American professor at Stanford University and researcher of artificial intelligence, among his other contributions to other fields of science.
* StrawVulcan: He looks at things from a logical, scientific standpoint, which often leaves him the odd man out in regards to the Gunpla Battle. This seems to come about because his primary reason for participating in the game is to learn about the Plavsky Particle rather than out of a fondness for ''Gundam'', model-building, or competition. As the show goes on, however, he gets more into gunpla battling.
* SwordBeam: Sengoku's Katanas can make these to deflect beams and to attack opponents with.
* SupernaturalMartialArts: Nils incorporates the principle of [[spoiler:"[[http://en.wikipedia.org/wiki/Fa_jin Fa Jin]]"]] into his Gunpla's hand to hand techniques, which means he can inject the Plavsky Particles from his Sengoku into his opponent's, destroying them from the inside out.
* TeenGenius: Has earned three [=PhDs=] in Particle Physics, High Energy Physics, and Euclidean Space Physics by the age of thirteen.
* ThinkNothingOfIt: In Episode 12 he pulls a BigDamnHeroes that helps Sei and friends beat the Mega Size Zaku. Afterwards Fellini goes to say thanks, but Nils insists that he was just extending the battle so he could get a better gauge on the Star Build Strike. Fellini sees right through it, thinking to himself that the battle must have gotten Nils' blood pumping.
* TokenMinority: And here's our resident black guy!
* WhenAllYouHaveIsAHammer: Nils has never equipped his prized gunpla with anything other than two katanas, which are all the weapons it needs.
** Subverted with the Ninpulse Gundam, which is ''literally'' armed to the teeth.

[[folder:Aila Jyrkiäinen]]

->Voiced by Creator/SaoriHayami

->Main Gunpla: NMX-004 Qubeley Papillon, [=SDV-04HWG=] Command Gundam, AC-01 Miss Sazabi

The top fighter in the Finland-based Gunpla team ''Nemesis''. She hails from the [[MythologyGag Flana Institute]].

* AnimalMotif: Butterflies.
* AttackDrone: Her suit is based around using dozens of remote controlled "beam funnels" to attack opponents.
* BackToBackBadasses: With [[spoiler:Reiji's Beginning Gundam]], using her SD Command Gundam in episode 16.
* BadassArmFold: [[spoiler:Her newly-built Miss Sazabi appears in this pose before it launched in Episode 25.]]
* BelligerentSexualTension: With Reiji.
* BeneathTheMask: Underneath her icy, detached shell is an unbridled passion for food. She is also tired of [[spoiler:being used by Team Nemesis as a tool to win them Gunpla tournaments]].
* BigEater: Buys up nearly all of the confectionery at the Gunpla World Tournament market. This, naturally, puts her in conflict with fellow BigEater Reiji. [[spoiler: [[CerebusRetcon It's heavily implied that her love of food comes from an impoverished background.]]]]
* BlushSticker: Gets a set in episode 22 [[spoiler:when Rinko accepts her into her household so that she can "get close to Reiji"]].
* CannotSpitItOut: Notwithstanding the fact that she's been hanging out with Reiji after their battle, [[spoiler:she still could not express her true feelings for him, even after wishing through the Arista to be with him at Arian.]]
* CherryTapping: In her introductory battle, she takes out an elite player piloting the Devil Gundam with a ''Jegan''. She doesn't even have an advantage in model quality. She's just that good.
* CurbStompBattle: She uses a [[RedShirt Jegan]] to beat the [[EldritchAbomination Devil Gundam]] Gunpla used by a member of Nemesis. Then she completely crushed the previous year's world champion.
* CurtainsMatchTheWindow: Has both white to silver-ish eyes and hair.
* CutenessProximity: Two words: [[BigEater GOOD FOOD]].
* DarkAndTroubledPast: Before Aila was inducted into the Flana Institute, [[spoiler:[[OrphansOrdeal she lived in poverty as an orphaned child]]]]. Nine Barthes exploits this to have her compete in Gunpla battles.
* DistaffCounterpart: To Reiji. They're both insanely talented fighters who aren't particularly big on the hobby side of the sport. She's also revealed to be a BigEater like Reiji is, which leads to a MeetCute.
* EarnYourHappyEnding: She gets hers in [[spoiler:Episode 21]] after enduring a... less-than-idyllic childhood and poor treatment from Team Nemesis. Moreover, when [[spoiler:Reiji returns to Arian in the finale, she is able to come along with him thanks to her having 'made a wish' through her Arista. As of the ''Island Wars'' OVA, she and Reiji are raising a daughter in Arian.]]
* EmotionlessGirl: Subverted. She behaves this way when Gunpla matters are involved, but it becomes more and more apparent that it's an assumed shell. [[spoiler:Any remaining traces of this go out the window when she quits Team Nemesis in Episode 21.]]
* {{Expy}}: Aila stands in for the various female SuperSoldier {{Tyke Bomb}}s with emotional issues in other ''Fanchise/{{Gundam}}'' series, like [[Anime/MobileSuitGundam Lalah Sune]], [[Anime/MobileSuitZetaGundam Four Murasame]], [[Anime/MobileSuitGundamZZ Ple Two]], [[Anime/MobileSuitGundam00 Soma Peries]] (who she physically resembles) or [[Anime/MobileFighterGGundam Allenby Beardsley]] (who also has fondness for food and Scandanavian nationality).
* LeParkour: Uses it to try and get away from Reiji in Episode 10.
* MythologyGag: She's from the Flana Institute, a play on the Flanagan Institute from the classic ''Gundam'' series.
* ModestyTowel: Appears in one in Episode 22, [[spoiler:as she comes out of the bathroom in Sei and Reiji's room]].
* NotSoStoic: Her icy, detached persona as a fighter tends to drop away when she's around food or [[BerserkButton people who try to keep her from her food]].
** The end of Episode 21 sees her totally abandon any trace of stoicism [[spoiler:due to her quitting Team Nemesis.]]
* OfficialCouple: At the end of Episode 21, [[spoiler:she and Reiji become this, notwithstanding the fact that he still did not get why she came to him at Arian in the final episode.]]
* ProperTightsWithASkirt: Her outfit includes a short dress and black pantyhose.
* RagsToRoyalty: [[spoiler:After living destitute for much of her childhood and subsequently being exploited by the Flana Institute, she ultimately wound up being transported to Arian where she would eventually wed Reiji, the Kingdom's crown prince.]]
* RapunzelHair: Waist-length
* RedOniBlueOni: The red to China's blue.
* SecretIdentity: Outside of her helmet and suit, no one aside from her sponsors knows her as Aila. She even tries to hide this further by claiming her name is [[Anime/MobileSuitGundamThe08thMSTeam Aina]].
* ShoutOut: Two, regarding her main Gunpla:
** The Qubeley Papillon had elements of ''Anime/DetonatorOrgun'' integrated to the base Qubeley's design.
** While the Miss Sazabi (the first one she made [[spoiler:after leaving Team Nemesis]]) had, apart from design cues from the [[Anime/MobileFighterGGundam Nobel]] and [[Anime/MobileSuitGundamSEEDDestiny Infinite Justice]], a redesigned head unit that made it look like a white Anime/{{Gunbuster}}. In fact, before it launched in episode 25, it used [[http://gundam.wikia.com/wiki/File:AC-01_Miss_Sazabi.jpg the same pose]] [[BadassArmFold as the latter.]]
* StayWithTheAliens: [[spoiler: When Reiji is forced to return to Arian, she uses her Arista crystal to go with him.]]
* SugarAndIcePersonality: A lot more emotional than she appears in front of her minders.
* SuperSenses: She can actually [[spoiler:sense the flow of Plavsky Particles.]] This gives her a huge edge in Gunpla battles because [[spoiler: [[PsychicPowers she can literally see what her opponent is going to do next. She is essentially a Build Fighter version of a Newtype.]]]]
* SuperSoldier: Technically, she's more of a Super Sportswoman, but she's designed to be the greatest Gunpla pilot on Earth.
* SuperStrength: Appears to be one of her enhancements - she's performed acrobatic feats that would tear an ordinary human's limbs off.
* TakeThisJobAndShoveIt: [[Pantheon/{{Emotion}} Deified]]. She ultimately does this toward [[spoiler:Team Nemesis]] in Episode 21 once [[spoiler:Reiji]] gives her a long-awaited opportunity to leave [[spoiler:by promising her a spot in Sei's house.]]
* TrademarkFavoriteFood: Not exactly official, but a lot of fanart (and even [[http://www.amiami.com/top/detail/detail?gcode=FIGURE-007776&page=top some official merchandise]] of hers) portray her love for Meat Buns. [[Pantheon/{{Food}} Also Deified, for that reason.]]
* {{Tsundere}}: Towards Reiji; perfectly illustrated in Episode 12 when she buys him a bag of meat buns, but claims she only did it so she wouldn't be indebted to him[[note]]In the previous episode he took a meat bun from her bag of snacks and gave her more than enough money to buy another[[/note]].
** Lampshaded by a track on the OST, which is titled "Aila - Reiji's Custom Tsundere."
* TsurimeEyes: An attribute that comes with her being a {{Tsundere}}.
* WhenSheSmiles: Aila is already quite pretty, but when she smiles it's truly a wondrous thing.
* WhiteHairBlackHeart: Parodied. She's a championship-level Gunpla battler, but has no interest in the ''Franchise/{{Gundam}}'' series or Gunpla in and of themselves. What she really likes is food.
* WillTheyOrWontThey: With Reiji. [[spoiler:In the end of Episode 21, TheyDo in the most hilarious, heartwarming, and spectacular way possible.]]
* WingdingEyes: When near food in episode 15.
* ZettaiRyouiki: A variation. Wears thigh high boots and a short dress, leaving a thin strip of her [[ProperTightsWithASkirt black pantyhose]] visible.

[[folder:Luang Dallara]]

->Voiced by Creator/TakuyaEguchi

->Main Gunpla: Abigorbine

The top fighter from Thailand, and a former baseball player.

* TheAce: When he played baseball, he had a batting average of .899; to put that into perspective, .300 is considered a very good batting average and the highest career batting average in UsefulNotes/MajorLeagueBaseball is .366. In regards to his piloting skills, Ral says Dallara's abilities are on par among the likes of [[Anime/MobileSuitGundam Char Aznable, Johnny Ridden]] and [[Anime/MobileSuitGundam0083StardustMemory Anavel Gato]]. To put into perspective, he fought Reiji and Mao at the same time, disables the Discharge system on the Build Strike, circles around so that neither Reiji or Mao can have a clear shot at him, and walks out unscathed. He is not called the "[[Anime/MobileSuitGundamAGE SUPER PILOT]]" for nothing.
* FriendlyRivalry: Of course he wants to win, but he still likes Sei and Reiji and respects their talents and makes sure they understand that.
* SpiritedCompetitor: He asks Sei and Reiji to make sure they go all out in their fights. When Reiji says "We're still gonna win", Luang replies "That's the spirit!"
* ShoutOut: His suit is a mix of Abigor from ''Victory Gundam'' and [[Anime/AuraBattlerDunbine Dunbine]].‎
* TheWorfEffect: In the Stinger for episode 17, Reiji and Sei are shocked to see Luang has been thrashed effortlessly by [[spoiler:the Renato Twins.]]
* WorthyOpponent: Before their match, he greets Sei and Reiji to say that he watched all their fights and highly respects their abilities.

[[folder:Mario and Julio Renato]]
[[caption-width-right:268:Mario on the left, Julio on the right]]

->Voiced by: Creator/YujiUeda

->Main Gunpla: [=MSM-03C=] Hygogg, TMF/A-802 [=BuCUE=] Tank, RGM-79K9 GM Sniper K9

Twin brothers who represent Argentina in the Gunpla Battle World Championship. Mario is the team builder, while Julio is their fighter.

* AlwaysIdenticalTwins: They're twins whose only difference [[IdenticalTwinIdTag is the direction they wear their identical haircuts. (Mario's hair sways left, Julio's right.)]]
* AwesomenessByAnalysis: They were able to figure out ''exactly'' how much power the Star Build Strike absorbed at the start of the Gunpla Race just by watching; [[spoiler:this ultimately lets them win because they know when Discharge Mode is about to run out.]]
** Which is ironic [[spoiler: since Yuuki was able to predict them placing bombs on his Gunpla's joints by studying their last battle]].
* BadassInANiceSuit: Both wear dress suits during Gunpla battles.
* TheBusCameBack: After completely sitting out ''Anime/GundamBuildFightersTry'', the brothers return in Episode 4 of ''Battlelouge'' along with a ''third'' brother, Seirio.
* CurbStompBattle: All we see of their fight against Luang is the latter's Gunpla shredded to pieces. We get to see how in Episode 18.
* ColdSniper: They're arrogant and icily businesslike, treating Gunpla fights like actual warfare, and favour sniping and ambush tactics.
* CombatPragmatist: They're highly creative tacticians, using everything from decoys and tripwire explosives to [[spoiler:tiny plastic soldiers carrying explosives]] to flush their enemies out, keep them off-balance, and destroy them.
* FriendlyRivalry: Averted. They're the only major competitors to not be this to Sei and Reiji on any level. Considering that all they cared about was crushing the new Meijin, it's easy to understand why.
* JackOfAllTrades: They use dozens of different Gunpla to fit any given match, only switching to their main model in the final championship tournament.
* MythologyGag: They both look like Kai from the original ''Anime/MobileSuitGundam''.
* OneManArmy: A mobile suit that contain a backpack that can transform into a Dog-type mobile suit, which in itself contain a troop carrier containing 8x 1/144 soldiers (according to the Gunpla preview). Yeah, that qualifies it.
* RedEyesTakeWarning: Their GM Sniper's visor and camera turn red [[spoiler:when they activate the EXAM System]], what follows is their villainous second wind.
* RobotDog: Their backpack can transform into a robot dog suit with a sniper rifle for a head.
* SeriousBusiness: People tells them that they're taking Gunpla way too seriously with their tactics. This is from people who already treat Gunpla as SeriousBusiness.
* SuperMode: The GM Sniper K9 is fitted with [[spoiler:the Blue Destiny's EXAM System]], serving as a nasty surprise for anyone trying to engage them in close-quarters combat.
* TalkingToThemself: Both brothers are voiced by the same voice actor, Creator/YujiUeda.
* ThemeTwinNaming: Mario sounds similar to "Mayo" ("May" in spanish) and Julio means "July".
* WeakButSkilled: The GM Sniper K9 is unexceptional at direct combat but excels at ambush tactics and guile, to the point where it and its operators give the mighty Meijin Kawaguchi III a serious run for his money.
** [[SubvertedTrope Subverted]] when [[spoiler: they reveal the EXAM System, which allows the GM Sniper to out-speed the Kämpfer Amazing]].

!Minor Rivals

[[folder:Susumu Sazaki]]

->Voiced by: Creator/RyoHirohashi
->Main Gunpla: YMS-15SS Gyan, YMS-15SS [=GyanGyaGyan=], YMS-15SS Gyan Vulcan

One of Sei's neighborhood acquaintances, and apparently a skilled Gunpla battler... Although he's more on the destructive side of the sport.

* TheBusCameBack: He returns in Episode 23.
* CrazyJealousGuy: Hates that Sei fights with Reiji instead of him.
* DualWielding : His [=GyanGyaGyan=] dual wields ''shields'' of all things. Do note that the Gyan shield fires missiles, making it less silly than it sounds.
* DudeLooksLikeAlady: Looks like a girl, talks like a girl, having the mannerisms of a girl... [[http://forums.spacebattles.com/threads/gundam-build-fighters.271923/page-2#post-12090065 well...]] and ScreamsLikeALittleGirl too.
* GatlingGood: In Episode 23, he makes a reappearance at the Gunpla Festival with his Gyan Vulcan. It's his [=GyanGyaGyan=], but he's now supplementing the shields with a new "Valuable Pod" [[BackpackCannon support backpack and armor attachment that sports twin 3-barrel Gatling guns]]. And puts it to effective use as he manages to beat Monta Gonda's Turn X Gundam, despite Turn X use of its Moonlight Butterfly system.
* JerkAss: Like rubbing his victories in his opponent's faces.
* JokeCharacter: He fulfills this role in the series, which is why people forget that he's actually a pretty good fighter in his own right.
* MoeAnthropomorphism: Played with. his haircut and jacket (especially the buttons) make him look like a cute kid version of his suit of choice, the Gyan.
* PunnyName: [=GyanGyaGyan=]. "Jyanjyajyan~!" is the japanese equivalent of "ta-dah!"
* PutOnABus[=/=]DemotedToExtra: Becomes this after his defeat.
* SciFiBobHaircut: Which he attempts to [[HairFlip ''flip'']] during his debut appearance.
* {{Yandere}}: Wants Sei to be his partner in gunpla battles, and [[WhatAnIdiot yet thinks he can get Sei to join him by destroying Sei's models in battle]].

[[folder:Kirara / Mihoshi]]
[[caption-width-right:217:[[labelnote:click here]]http://static.tvtropes.org/pmwiki/pub/images/mihoshi_4331.png[[/labelnote]] to see her as Mihoshi]]

->Voiced by: Creator/AoiYuuki
->Main Gunpla: AGX-04 Gerbera Tetra

An up-and-coming idol singer who entered the battle tournament in order to further her dreams.

* BareYourMidriff: In her idol outfit, her belly is left completely exposed.
* BecomingTheMask: In her initial appearance, she claimed that she was only involved in Gundam or Gunpla to further her idol career, and her Gerbera Tetra was built for her by fans. However, in episode 6 she's seen intently watching the finals of the qualifiers, and is shown to be ''very'' emotionally invested in the outcomes of matches during her stint as the mascot of the World Tournament.
** During the Gunpla Festival in Episode 23, she joins in a Gunpla Battle with a Gerbera Tetra she built herself. Fellini remarks that while it's still pretty rough, it was built with time and care.
* BetaCouple: With Fellini by Episode 20.
* BitchInSheepsClothing: Mihoshi appears to be an avid fan of Gundam and Gunpla, sharing a bottle of tea with Sei and admiring the Build Strike's construction. [[spoiler:She actually put laxative in the tea so she could scratch up Build Strike's joints while Sei ran to the bathroom.]]
* TheBusCameBack: Returns for the world tournament arc in episode 10, after her initial defeat in episode 4. She's there as the tournament's image character.
* CheatersNeverProsper: Kirara nearly wins the match against Sei and Reiji after sabotaging Strike's limbs as Mihoshi. She still loses thanks to the Build Booster's transformation function.
* ChristmasCake: Is actually 27 by the time the series rolls around. It's one of her primary motivations for wanting to be an idol and hit sucess '''NOW''', because she's ''way'' past the normal ''expiry'' age for idols.[[note]]Most idols don't make it past 25.[[/note]]
* CombatPragmatist: Will use whatever it takes to win and further her idol career, including spying and sabotage. Interestingly, she isn't judged all that harshly for this - Reiji, for instance, thinks it's a perfectly reasonable strategy to use.
* CompositeCharacter: Combines design elements from [[Anime/MobileSuitGundamSeedDestiny Meer Campbell]], [[Anime/AfterWarGundamX Tiffa Adill]] and [[Anime/MobileSuitGundamAGE Yurin L'Ciel]] from previous ''Gundam'' series.
** Her appearance for the episode 10 basically mix both aspect of Kirara and Mihoshi, with a dash of [[Anime/MobileSuitGundam00 Wang Liu Mei]] mixed in.
** She also has similarities with [[TeenIdol Saki Rukino]] and [[PlayfulHacker Akira]] [[ActorAllusion Renbokoji]], 2 female characters from ''Anime/ValvraveTheLiberator'' which is also created by Sunrise. As Kirara, she is also an idol like Saki and as Mihoshi, she has her hair tied in a long ponytail and also wears thick clothing like Akira. Finally, she is a pilot (Gunpla Fighter in this case) like the two.
* CurtainsMatchTheWindow: Mihoshi's hair and eyes are both purple. No longer holds when she puts on her pink Kirara wig.
* {{Determinator}}: During her training to become a Gunpla Idol, she sat through 20+ shows of a franchise she barely understands, and memorized hundreds of obscure mobile suit variations from [=OVAs=] and other MSV lines. Whatever it took to realize her dream to become an idol.
* EasilyForgiven: Despite her manipulating Sei and sabotaging his Gunpla before their battle, he doesn't hold it against her. Considering how seriously he takes Gunpla his building, you'd think he'd at at least be ''somewhat'' bitter about it. Reiji, as mentioned above, considers it a legitimate strategy, so he wasn't even upset, and is even glad to see she's still working as hard as she can to become an idol.
* HeelFaceTurn: Starts out as an opponent of Sei and Reiji during the qualifiers arc, only to return as a supporter of their group during the world championships arc.
* HoneyTrap: Pretends to be interested in Sei so she can damage his Gunpla in episode 4.
* GirlishPigtails: As Kirara.
* LadyInRed: During the ball in episode 10. While her [[{{Qipao}} dress]] fits the part, her attempts to act sultry fall rather flat.
* MoreDakka: Her Gerbera Tetra uses a beam machinegun and an forearm autocannon. As a result, she fared a bit better than the other members of the gang in Episode 25 (until her beam MG overheated, anyhow).
* MsFanservice: She wears plenty of revealing and/or tight-fitting outfits, has the curves to fill them [[BuxomIsBetter quite nicely]], and gets a fair amount of MaleGaze.
* PinkMeansFeminine: Has pink hair as a idol and uses a pink Gerbera Tetra.
* {{Qipao}}: Her party dress is a tight-fitting, [[LadyInRed dark red]], Chinese-style dress.
* RapunzelHair
* TookALevelInKindness: After Episode 6, she's a significantly nicer person.
* WhoWearsShortShorts: Her idol outfit.
* WorthyOpponent: Reiji considers her one, seeing her more underhanded tactics as nothing but a sign of her determination. Unfortunately for her, he wants to win just as much.

[[folder:Caroline Yajima]]

->Voiced by: Creator/ChiwaSaito
->Main Gunpla: Knight Gundam (SD Version), Full Armor Knight Gundam (SD Version)

Daughter to the head of the corporation who sponsored Nils. She was introduced into the series as China's UnknownRival, a fact that she is painfully pissed at.

* AllGirlsLikePonies: Not only is she in riding gear by default, ''she owns her own horse.'' Further alluded to with her Knight Gundam, which can turn into centaur mode.
* AlwaysSecondBest: No matter how talented she is and no matter how hard she tries, Caroline could never beat China in an art competition.
* BerserkButton: Doesn't like being called "Caro-chan". Oddly enough, she doesn't react to it when someone's calls her so in the last episode.
* BlushSticker: there are always two pink circles on her cheeks, regardless of her expression.
* ButNotTooForeign: Her father's Japanese while her mom's a Caucasian. The only thing that really sets her apart from the other Japanese kids in the series is her blonde hair.
* CoolHorse: The horse Nils can be seen riding in the second ending is hers.
* EmbarrassingNickname: Doesn't like it when China calls her "Caro-chan" instead of Caroline.
* GratuitousFrench: Drops it occasionally; "oui oui," and "adieu!"
* MixedAncestry: Has an Asian father and Caucasian mother.
* MultiethnicName: Caroline (European) Yajima (Japanese).
* NoblewomansLaugh: "Ohohohoho!"
* NotSoAboveItAll: She's shocked that her painting lost to one based on a "toy", but later gushes over how cute Bearguy is when China shows it to her.
* NoSenseOfPersonalSpace: Towards Nils in some instances; she even snuck up behind him the day before his match with Sei and Reiji.
* {{Ojou}}: Her father owns a multi-national conglomerate.
* OjouRinglets: Has four of these, with a couple more at the back.
* TemptingFate: In the final battle, Ral and Master Chinnan make their entrance and Caroline says that "the tide has turned". Cue WaveMotionGun destroying thousands of MechaMooks.
* {{Tsundere}}: She gets easily flustered around China.
* UnknownRival: She considers China to be her WorthyOpponent, a fact China is oblivious to.
* WackyMarriageProposal: A variation: While Nils was [[spoiler: tailing the trucks that contained Plavsky Particle crystals]], she instantly appears behind him and insists that she accompany him, right before she declares him as her fiance.
-->'''Nils:''' Our relationship has gone forward?
** [[spoiler: [[Anime/GundamBuildFightersTry Seven years later,]] it looks like she followed through on that.]]
* ZettaiRyouiki: Type C.

[[folder:Rainer Cziommer]]

-> Voiced by: Creator/NobutoshiCanna
A Gunpla Fighter hailing from Germany. Having been humiliated by Fellini in the past, he aims to use the World Championship as a stage to settle the score.
* AceCustom: All of his Gunpla are painted in his signature blue and red colors. Not that it helps their performance in any way.
** Among his Gunpla his [[Anime/MobileSuitGundam Gaw]] MS Carrier and his [[Anime/TurnAGundam JMA-0530 WaDom]] Mobile Armor stand out as no 1/144 Gunpla kits for those exist at all, meaning they're scratch builds. Scratch builds that both get absolutely totaled. ''Ouch''.
* ArchEnemy: Considers Fellini his.
* ButtMonkey: He quickly starts losing his battles in increasingly humiliating fashions.
* TheChewToy: Since Felinni is one of the protagonists, the audience is encouraged to laugh at Rainer's increasingly humiliating defeats.
* FieryRedhead
* HeartbrokenBadass: Tries to be this when facing Fellini, with a HEAVY emphasis on ''tries''.
* ItsPersonal: Has sworn vengeance against Fellini for the latter having stolen his girlfriend during last year's competition.
* OcularGushers: Happened a lot in episode 23 where he kept losing over and over.
* RedOniBlueOni: The red to Fellini's blue.
* RevengeBeforeReason: Doesn't even try to advance in the tournament, instead focusing all his attentions on trying to take down Fellini.
* ThereIsNoKillLikeOverkill: In order to ensure his victory against Fellini, Cziommer built a model of a ''Gaw'', a massive airborne MS carrier over a hundred meters in length armed with powerful cannons and a large amount of bombs, which he also used to carry five other contestants into battle along with him.
** To put that in perspective, the series uses 1/144 models. That means that his Gaw is 50cm tall, and a meter wide. On top of that, this kit ''does not exist''. That means it's a scratch build. A meter wide scratch build (In fact, Fellini actually complimented the build). Of course, it gets destroyed. Considering the sheer amount of time and effort it must have taken to make... Poor guy.
* VillainDecay: The first time we see him fighting, he demonstrates a fair amount of skill. The second time, he actually gives the heroes a run for their money... until victory is ingloriously snatched away from him. It all goes downhill from there.
** Cziommer's decay is complete during the Gunpla Festival, where random kids keep defeating him, including [[Anime/MobileSuitGundam0080WarInThePocket Alfred Izuruha]].

[[folder:Julian Mackenzie]]

-> Main Gunpla: F91 Gundam F91 Imagine

A gunpla fighter from Manchester, England, Julian was formerly a student of the Gunpla Academy alongside Tatsuya, before he quit gunpla three years ago. He now returns to gunpla to battle Meijin in the semifinals, replacing his grandfather who suffered a heart attack...

* AcePilot: How good is he? In the past, Yuuki fought seven battles with him, and lost all of them. Three years ago, Julian was considered the best candidate to be Meijin III. If he'd had more practice and the F91 Imagine had been in better shape, Julian would have won their match.
* LightningBruiser: The F91 Imagine. It's so fast, the Amazing Exia has to use Trans-Am to keep up with it.
* RefusalOfTheCall: He was a shoo-in to be Meijin III, but Julian left because he disagreed with Meijin II's win at all cost philosophy.
* PunnyName: Like Amazing, Imagine when pronounced with a Japanese accent sounds very similar to Meijin.
* RetiredBadass: Quit gunpla three years ago, and is only now coming back because his grandfather begged him to replace him.
* TakeUpMySword: A variation, in that the gunpla his grandfather wants him to use is actually his.


[[folder:Allan Adams]]

->Voiced by: Creator/SubaruKimura

->Main Gunpla: PPMS-18E Kämpfer Amazing

Chief Engineer at PPSE. He serves as Meijin Kawaguchi's right-hand man, providing him the necessary info and resources he needs for the tournament.

* BenevolentBoss: All the other engineers under Allan at PPSE seem to like him. [[spoiler:He's also not happy with the Mega Zaku's interference, which is probably why he doesn't discipline Meijin for helping stop it.]]
** [[spoiler: He is also absolutely pissed when PPSE forces the Embody system on Yuuki and tries to wrestle the controller away from Nines the first chance he gets]].
* TheEngineer: Built Meijin Kawaguchi's custom Kämpfer Amazing, and designed and supervised the Amazing Exia.
* EnergyWeapon: the Kämpfer Amazing he designed uses numerous beam weapons, despite Meijin's former preference for the {{Kinetic|WeaponsAreJustBetter}} kind.
* FirstNameBasis: With [[spoiler:Yuuki.]]
* GuyInBack: Becomes this for Meijin in the match against the Renato brothers and Julian Mackenzie, serving as his flight engineer.
* HotScientist: Is Chief Engineer at PPSE, and an extremely good looking one at that.
* LimitedWardrobe: Is only ever seen in his PPSE Engineer uniform, even when off-duty.
* MissionControl: Serves as this for Meijin Kawaguchi.
* ReasonableAuthorityFigure: Willing to side with Meijin over his superiors when push comes to shove, despite being a major employee at PPSE.
* RedOniBlueOni: The calmer blue to Meijin's secretly hot blooded red.

[[folder:Chairman Mashita]]

->Voiced by: Tetsuo Sakaguchi

The owner of the company producing both the Plavsky Particles and Gunpla models. He seems to know Reiji and bears a grudge against him.
* AffablyEvil: He is pretty childish and friendly, when he's not trying to do sinister things to get Reiji out of his hair.
* AmbitionIsEvil: Completely averted. His only goal is to be rich and live comfortably, and he doesn't use the plavsky particles for bigger purposes, be they sinister or good, because it would take too much work and he already has money.
* BigBad: He's the one pulling the strings in the world tournament arc to get Reiji out of the championships.
* BigBadWannabe: He isn't very good at keeping Reiji out of the tournament. In fact, he just brings himself to Reiji's attention, the very thing he was trying to prevent, sooner.
* BitingTheHandHumor: Rumor has it he's based on a certain Bandai executive who doesn't care for ''Gundam'' and prefers {{Tokusatsu}} properties.
* CoolCar[=/=]AbsurdlyLongLimousine: In Episode 16 we see that he owns [[Anime/MobileSuitGundamWing Dorothy Catalonia's]] gold limo.
* CutLexLuthorACheck: Played with. Using the Plavsky Particles for gunpla battles ''has'' made him fabulously wealthy, but there are a myriad of other potential applications that could also make him money--such as the scientific applications Nilis is pushing for--if he would just stop being so narrow-minded and selfish. A straighter example occurs in episode twenty four, when [[spoiler: ''mind control'']] applications for the plavsky particles are discovered, but he shoots down the idea of using it to [[spoiler: take over the world.]] Justified because he lacks the ambition to do that and feels it would take too much work. He's fine with just being rich.
* DarkSecret: He is the only person who knows how to manufacture [[spoiler:Plavsky Particles]]. The main reason he's gunning after Reiji is to stop him from revealing the information to the world.
* EvilCounterpart: of Reiji. They both have little ambition and just cares about self satisfaction, and is friends with a much smarter Gunpla Fan. [[spoiler: They are also both from Arian, although Mashita is a mere criminal.]]
* {{Expy}}: Cast in the same mold as Wong Yun Fat from ''Anime/MobileFighterGGundam'', for being a ManChild twisting the rules in order to screw over the main characters.
** Visually, he looks very similar to [[Anime/MobileSuitGundam Tem Ray]], the creator of the original Gundam which parallels Mashita's creation of Gunpla Battle.
* HarmlessVillain: When it's brought up that he could [[spoiler:brainwash people into doing his bidding, like with Meijin Kawaguchi III, and use this to TakeOverTheWorld]], he outright says it's too much work for him, and he's perfectly content being rich. The ''only'' reason he's motivated into doing anything villainous at all is his fear of [[spoiler:being taken back to Arian and arrested for stealing from the Royal Treasury.]]
* {{Irony}}: The chairman of the Gunpla Battle making corporation is absolutely clueless about Gundam. His own secretary has to tell him what a ''Zaku'' is called, one of the most iconic symbols in the series.
* KarmaHoudini: Zig-zagged; while Mashita never gets explicitly punished for stealing the Arista, he ''does'' end up teleporting back to Arian after the crystal is destroyed, meaning he loses his ill-gotten fortune. However, Baker went with him, and the last we see is them selling Gunpla on the streets of Arian, making an honest living and looking pretty happy.
* NonActionBigBad: All he does in the series is order people to get rid of Sei and Reiji. When confronted, he's absolutely helpless.
* RagsToRiches: [[spoiler: Was a petty thief in Arian, who managed to found PPSE and use the giant Arista for Gunpla battle.]]
* TheReveal: In Episode 24, we find out the reason why he's willing to do anything to stop Reiji from winning the tournament. [[spoiler:He was a thief back in Arian and is afraid that Reiji would arrest him if the latter found out he stole the Arista from Reiji's palace.]]
* RevealingCoverup: Everything he does to get Reiji and Sei kicked out of the competition just draws more and more attention to himself.
* ScrewTheRulesIMakeThem: How he justifies sending [[spoiler: a giant Zaku]] after the Star Build Strike.
* VillainousBreakdown: At first, played for laughs and deconstructecd from him seeing Reiji at the World Tournament and Sei and Reiji constantly overcoming all the additional obstacles Baker and him put in their way. Throwing childish tantrums and freaking out every time it happens. [[spoiler:Reconstructed in episodes 23 through 25. His worry that he will be returned to being a nobody on Arian, still believing that Reiji is there to arrest him for the theft from the royal treasure, and constant failures to stop them sends his paranoia levels so high, he's completely willing to force an even crueler, Arista powered version of the EMBODY system onto Tatsuya Yuuki/Meijin III. And he forces him to fight using the very same methods of the 2nd Meijin that disgusted Tatsuya in the first place.]]
* VillainousFriendship: with Baker. As it turns out, they founded PPSE together.


->Voiced by: Natsuki Aikawa

Chairman Mashita's secretary. She tends to the Chairman's needs and carries out any of his requests without question.
* CosplayOtakuGirl: Mashita first met her when she was cosplaying as Sayla Mass. Plus she's the knowledgeable one when it comes to gunpla and Gundam.
* TheDragon: Serves as BigBad Chairman Mashita's right hand woman.
* DragonInChief: She practically does all the work and thinking for him.
* EvilCounterpart: To Sei. Like Sei, she is a hardcore Gunpla fan and first ran into Mashita while she was cosplaying [[Anime/MobileSuitGundam Sayla Mass.]] [[spoiler:She is also a partner of someone from Arian.]]
* FaceFault: Her expression at the end of episode 19 [[spoiler:after seeing the Sei-Reiji duo defeat Nils.]]
* FourEyesZeroSoul: When enemies of the Chairman are concerned.
* HyperCompetentSidekick: She handles most of the Chairman's business, and has the extensive knowledge of ''Gundam'' and Gunpla her boss seems to lack. Not to mention her reflexes are above par as well, since she realizes that her and the Chairman are being eavesdropped on in episode 15.
* {{Meganekko}}: a woman with a pair of attractive black rimmed glasses.
* OnlyOneName: She's just Baker. No first name given.
* ScaryShinyGlasses: Hilariously, she gets this during her VillainousBreakdown in episode 11.
* SexySecretary: Serves as the secretary of the head of PPSE, while also being a very attractive woman.
* SharpDressedMan: Can always been seen in an attractive blue business jacket and skirt number.
* StayWithTheAliens: [[spoiler: When Mashita begins to warp back to Arian, Baker grabs him and is teleported there with him. In the epilogue they are seen selling Gunpla to the Arian people.]]
* UndyingLoyalty: Continues carrying out Mashita's plans ''happily'', despite being given no good reason for trying to cheat two kids out of one of PPSE's major events. [[spoiler:And when Mashita is returned to Arian, she unhesitatingly goes with him.]]
* VillainousFriendship: with Mashita. As it turns out, they founded PPSE together.


->Main Gunpla: Hell Zeong Marine, Hell Zeong Galaxy

A man who will accept any job and carry it out to perfection, as long as the price is right. He is hired by Baker to keep Sei and Reiji from reaching the World Championship finals.
* CombatTentacles: The Hell Zeong Marine is built with a huge set of these for legs.
* EvilIsPetty: His attack on Reiji at the mall would have served no long-term purpose - it wouldn't have eliminated him from the tournament or damaged a strategically-vital suit. He just wanted to ruin a kid's day.
* FatalFlaw ({{Pride}}): He did not take not being able to destroy the Star Build Strike well. His quest to finish the job is what ultimately does him in.
* MysteriousMercenaryPursuer: Little is known about him other than him being hired to make Sei and Reiji lose the race period during the championships.
* SinisterShades: He's never seen without them.
* SmallRoleBigImpact: He's pretty much the reason ''GM's Counterattack'' took place, as his defeat put all the Build Fighters in the Gunpla Mafia's sights. Not surprisingly, his FatalFlaw is part of their GangOfHats shtick.
* TheVoiceless: He only talks to Baker over the phone but we never hear what he had said.

!Other Characters

[[folder:Rinko Iori]]

->Voiced by: Creator/KotonoMitsuishi

Sei's mother and owner of her family's model shop.

* ColorFailure: With Sei and China, upon seeing [[spoiler:Aila in a ModestyTowel]] in episode 22.
* DatePeepers: Peeks in on Sei and China while the latter is using the store's airbrush; when Sei complains, she says (with sparkles in her eyes) "Pretend I'm not here!"
* MsFanservice: Mr. Ral has a thing for her.
** As do the show's producers. And the viewers. And ''especially'' the [[RuleThirtyFour fan artists]].
* ShipperOnDeck:
** Very supportive of China's pursuit of her son, going so far as to peek their conversation in the compressor room. She also spared no effort in pushing her towards Sei during the BeachEpisode.
** As of episode 22, she also seems quite supportive of [[spoiler:Aila's feelings for Reiji]].
* SupremeChef: [[AllThereInTheManual Supplemental data]] reveals that she's quite a cook, with vegetable stir-fry as her trademark dish.
* SweaterGirl: usually wears a yellow one. And she certainly wears it well.
* WingdingEyes: Gets these whenever she gets excited about Sei and China's relationship.

[[folder:Takeshi Iori]]

->Voiced by: Tokuyoshi Kawashima (Japanese) and Seth Leslie (English)
->Main Gunpla: RX-78-2 Gundam, PF-78-1 Perfect Gundam

Sei's father and previous runner-up of the second Gunpla Battle Tournament. Is currently tending to Gunpla-related activities overseas.
* TheAce: Came in second place in the first Gunpla Battle world championships. [[spoiler:And he's a pretty competent hand-to-hand fighter too.]]
* AcePilot: Considering he competed in the World Championships with nothing more than the basic RX-78-2 when literally every other contender flew a top-grade custom unit, one can assume he's right up there with Master Chinnan in terms of raw skill and experience.
* CombatReferee: Is an official PPSE ref, and busts "C" after he interferes in Reiji and Aila's casual battle.
* DisappearedDad: At the start of the series, he is off abroad.
* DrillSergeantNasty: A humorous version, when he teaches Reiji and Aila to build Gunpla he starts acting like this, even telling them that the only words he should hear out of their mouths are "Sir, Yes Sir!"
* HappilyMarried: [[spoiler:In Episode 16, when he finds the model store is closed, he sobs about how he came all this way to see Rinko again and starts shouting "I LOVE YOU RINNY!" in an attempt to find her.]]
** [[spoiler: His reunion with his family in Episode 23 is a thing of heartwarming feels.]]
* LikeFatherLikeSon: [[spoiler:When Reiji meets him in Episode 16, Takeshi acts a '''lot''' like Sei, fanboying over Gunpla before acting super-strict about building them. Reiji even thinks to himself "Who does this old guy remind me of?"]]
* MenCantKeepHouse: Without his wife, he seems to be only capable of subsisting on a combination of instant food and bottled drinks, the cartons of which he can't even be bothered with to dispose of properly.
* OlderIsBetter: Used a classic RX-78-2 Gundam from the original ''Anime/MobileSuitGundam'' anime.
* WhenAllYouHaveIsAHammer: He came in second place in the world tournament with his RX-78-2 and '''only''' this model.
* WigDressAccent: Disguises himself with a beard in Episode 16.
* WingdingEyes: Gets stars in his eyes whenever he's talking about or explaining how to build Gunpla, just like his son.

[[folder:Mr. Ral]]
->Voiced by: Creator/MasashiHirose
->Main Gunpla: MS-07B Gouf, MS-07BR35 Gouf R35

A regular at the Iori Model shop, and an acquaintance of Sei's parents. Ral takes Reiji under his wing and shows him a thing or two about Gunpla Battle. In ''Anime/GundamBuildFightersTry'', he's the coach of Seiho Academy's Gunpla Battle Club.
* BerserkButton: Do NOT mess with a legitimate Gunpla Battle. He will fight you if you do.
* BreakoutCharacter: He's based off Ramba Ral, a [[MonsterOfTheWeek Villain Of The Week ]] back in ''Anime/MobileSuitGundam''. Now he's a recurring character.
* CelebrityParadox: It's not entirely clear if he's just really into {{Cosplay}} or actually a version of Ramba Ral from ''Anime/MobileSuitGundam'', which is a fictional TV show in the ''Build Fighters'' continuity.
** On top of that, it's a version of Ramba Ral being played by the voice actor that played Ramba Ral.
* CharacterTics: His butt itches at the slightest hint of ShipTease.
* CombinationAttack: With [[spoiler:Master Chinnan]].
* CrouchingMoronHiddenBadass: He may act a bit silly sometimes, but his skill and knowledge of Gunpla battle is unquestionable.
* TheDreaded: No one who knows him dares to cross him. Even a Japanese gangster / land shark like Tatsuzo the Burning.
* HopelessSuitor: Has a rather obvious crush on Rinko, Sei's mother, but the fact that she's HappilyMarried sorta throws a wrench into the whole thing. Not that he seems to mind, looking on approvingly as she reunites with her husband, while shooting a disapproving look at Master Chinnan, who just sighs with disappointment, said reunion interrupting his ogling of Rinko's chest.
* JokeCharacter: His Best Mecha Collection Gouf, a suit from a line of [[WeaksauceWeakness super low quality models]]. He has a much nicer High Grade Gouf, but he doesn't battle with it.
* LastNameBasis: Only goes by "Mr. Ral", no first name given. [[spoiler: Until Takeshi calls him Ramba.]]
* LethalJokeCharacter: When he does get in on the action in the finale with his Gouf R35, he easily takes down hundreds if not thousands of mecha mooks, enough that Fellini is impressed speechless.
* LetsGetDangerous: In the final episode.
* KineticWeaponsAreJustBetter: His Gouf R35 sports a pair of five-barreled arm cannons instead of beam weapons.
* OffscreenTeleportation: Has a tendency to suddenly appear wherever a gunpla battle is taking place, be it the official arena, or in the Iori household.
* MrExposition: If there's any info to mention, it'll usually be said by him.
* RedBaron: His nickname is ''The Blue Giant''.
* SeriousBusiness: Gunpla Battles.
* ShipperOnDeck: Some people misinterpreted his protective nature towards Sei's mom as {{Ship Tease}}s, but it just turns out that he's very approving of her relationship with her husband, and nods his head in approval upon witnessing their reunion.
* TalkingIsAFreeAction: Averted. He spent too much time talking to Reiji that his Gouf gets defeated by him.
* VeteranInstructor: To the Gunpla Battle Club in ''Try''.
* YoungerThanTheyLook: He's 35. This is also a reference to Mobile Suit Gundam, celebrating it's 35th anniversary as of the production of this series. So, both Mr. Ral and Ramba Ral are 35 years old.

[[folder: Master Chinnan]]

->Voiced by: Creator/MinoruInaba
->Main Gunpla: [=GF12-035NH/GF13-001NH=] Kowloon Gundam, [=GF13-001NHII=] Master Gundam

Grandmaster of the Gunpla Shingyo School and Mao's teacher. A Buddhist monk, in addition to collecting Gunpla, he collects figures of female characters from various Gundam series. Believes that Gunpla must reflect its builder's heart and uses this as the main principle of the Gunpla Shingyo School.
* BokeAndTsukkomiRoutine: His revealing of who his favorite female Gundam character is treated as one with him as the ''boke'' and Mao as the ''Tsukomi''.
* CombinationAttack: With [[spoiler:Mr. Ral]].
* CoolOldGuy: Is an aged Buddhist monk, but enjoys building Gunpla and competing in Gunpla battles.
* DirtyOldMan: When asked by Mao who his favorite female Gundam character is, his thoughts immediately go to [[Anime/MobileSuitGundamSEED Murrue Ramius]] and her penchant for {{Gainaxing}}. Not to mention he owns figurines of a number of famous Gundam heroines.
* {{Expy}}: Of [[Anime/MobileFighterGGundam Master Asia]] to a point. He basically serves as this to Mao's Domon. Also fond of going into a one legged crane stance, just like Master Asia's and uses a custom Kowloon (Haow) Gundam. And then in episode 25, he uses a custom Master Gundam.
* LetsGetDangerous: In the final episode.

[[folder:Nine Barthes]]

->Voiced by: Daichi Endō
->Main Gunpla: NMX-004 Qubeley Papillon, PPGN-001/DM Gundam Exia Dark Matter

Aila's manger, mission control, and trainer.
* FauxAffablyEvil: Before [[spoiler:the battle against Sei and Reiji]], he insists that Aila accepts China's good luck charm. He also threatens to take everything away from her life and willingly increases the output on the Embody System [[spoiler:when she refuses to finish her opponents.]]
* FourEyesZeroSoul: He wears glasses and has no qualms in increasing the output for the Embody System. See the tropes below for further details.
* KnightOfCerebus: Whenever he gets focused on, expect the show to take a sharp turn into serious territory.
* LackOfEmpathy: Any sign of care he showed during his scouting trip disappear after convincing Aila to join the Flana Institute, as sees her as nothing but an opportunity for Team Nemesis to win Gunpla battles. He also knows that the dangerous Embody System is against the tournament rules, but given that the system could be hidden in a cosplay and that it would increase [[spoiler:Aila's particle reaction time to 99.7%]], he utilizes it anyway.
* ManipulativeBastard: He forces Aila to undergo treatments and endless training, threatening to toss her out in the streets if she refuses. [[spoiler:Keep in mind that Aila is an ''orphan.'']]
* MindRape: The Embody System he designs is meant to do just that. In addition to artifically increasing particle reaction time, it also forces the pilot to follow commands if he or she refuses to beat an opponent for whatever reason. Cases in point: [[spoiler:Aila and Yuuki]].
* MorallyAmbiguousDoctorate: Nine only cares about his research on Aila's ability, to the point where he MindRape her via the Embody System whenever [[spoiler:she refuses to obey his commands]].
* MissionControl: For Aila. Usually points out what the enemy is doing and issues battle plans.
* OnlyInItForTheMoney: Nine regards himself as a mercenary and has no problems being extremely cruel to his test subjects due to the fact that other people are paying him big bucks to ensure he has them win.
* WhatHappenedToTheMouse: He's nowhere to been found or mentioned in Episode 25.

[[folder:Yana Kuramochi]]
->Main Gunpla: ZGMF-N222 Nya-Nyaia Gundam

A character introduced in the ''Build Fighters Amazing'' side manga, she served as Tatsuya's personal maid when he was seven years old.
* CryIntoChest: Yuuki did this to her back when he was seven when [[spoiler:Toru Satsuki had to leave after his father got bankrupt]]. It's played for laughs later on, much to Yuuki's annoyance.
-->Yanna: And little Tatsuya crying into my chest. Seriously soo cute!
-->Yuuki: Don't start. [[NeverLiveItDown Worst mistake of my life]]...
* CutenessProximity: The main offensive weapon of her Nyaia Gundam, she hopes that her enemies would be distracted by the cuteness that they don't want to hurt it and surrender.
* TheDitz: What she acts likes most of the time.
* InnocentInnuendo: Mentions to Tatsuya that [[http://www.batoto.net/read/_/230270/gundam-build-fighters-a_ch5_by_newtype-of-world/13 it would be grateful]] if they ever did "[[SayItWithHearts that...]]" The next few frames continued this trope [[spoiler: until it was revealed that she was just building her own Gunpla. In a cat maid outfit, no less.]]
* {{Meido}}: To Tatsuya
* {{Meganekko}}: Wears a pair of round glasses.
* ObfuscatingStupidity: Under that ditzy personality though lies a very caring maid as well as an anime nut. She managed to arrange for Tatsuya to end up in a gunpla battle with Takeshi Iori and so reignite his passion for gunpla.

[[folder:Meijin Kawaguchi the Second]]
->Main Gunpla: Cathedral Gundam

The 2nd World Gunpla Battle Champion and the second person to have the title "Meijin Kawaguchi". However his illness has prevented him from participating in the 7th Gunpla Tournament and so his title is passed onto Tatsuya Yuuki.
* TheAce: Said to have mastered both the art of building and battling in Gunpla.
* BloodKnight: Said to be extremely vicious in battle.
* BrightIsNotGood: The only Gunpla he's been shown using is the Cathedral Gundam, which is mostly whites and gold in color.
* EvilMentor: Tries to be this to the Gunpla Academy, but Julian and eventually Tatsuya defy his ideology.
* FaceFramedInShadow: Usually how he is depicted.
* IncurableCoughOfDeath: Frequently shown coughing up blood. By the events of the anime he's been hospitalised.
* SecondPlaceIsForLosers: His motto is "Victory is Everything" and he wins by any means necessary.
* SinisterShades: Often the only part of his face we see.