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Voiced by Mikako Komatsu
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 CosmosA 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.
- Berserk Button: When Nils shows that he only thinks of the tournament as a way to find out about Plavsky particles, Sei is pissed.
- Chaste Hero: 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 justifiably disapproves. And as for the analysis of China's swimsuit, he's also visibly flustered.
- Curtains Match the Window: Blue hair and eyes, which he got from his mom.
- Color Failure: With his mother and China, upon seeing Aila in a Modesty Towel in episode 22.
- The Engineer: 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. Sei proves to be an excellent pilot once conquering this fear.
- Energy Absorption: The Star Build Strike's shield can absorb any energy fire, the energy it takes is used for the Discharge system.
- Expy: Of 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.
- Genre Savvy: Sei's knowledge of the Gundam series allows him to create clever traps he had seen in various Gundam series.
- Guy in Back: Sei is essentially this for Reiji, serving as a flight engineer, combat strategist and additional set of eyes.
- Hot-Blooded: Starts off as a sweet kid, but becomes increasingly amped up during the Gunpla World Championship 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 Mission Control.
- Well… at first, anyway. 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.
- Logical Weakness: 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.
- Moe Anthropomorphism: 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 Jegan.
- Next Tier Power-Up: Upgrades from the Build Strike to the Build Mk-II in episode 6, then Mk-II to Star Build Strike in episode 10.
- Not What It Looks Like: He just wanted to talk about Gundam and Gunpla with Mihoshi and was more upset about losing a Gunpla-loving friend than her sabotaging the Build Strike's joints.
- Oblivious to Love: Poor China. Though episode 9 implies he might not be that oblivious after all. In episode 18, he actually tries to ask her out on a date.
- Official Couple: 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 Blu-Ray edition extra scene, they're living together in Paris, France.
- Red Oni, Blue Oni: The Blue to Reiji's Red.
- She Is Not My Girlfriend: Says this to Caroline about China.
- Sleepy Head: Works way too late on his models, causing him to often be tired during the day.
- Strong Family Resemblance: Looks exactly like his mom, only shorter and male.
- Super Mode: 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 Dangerous Forbidden Technique because utilizing this mode wears the Star Build Strike faster, becoming more susceptible to damage.
- Took a Level in Badass: In Episode 23, 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. 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, he fights Meijin III to a standstill, and would probably have won.
- To Be a Master: 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.
- Weirdness Magnet: 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.
- Willfully Weak: 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.
- Will They or Won't They?: With China. But as it turns out in the Blu-Ray edition extra scene, They Do.
- Wingding Eyes: 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 GundamA 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...
- Audience Surrogate: Most info about Japanese pop culture / customs / Gundams / etc. gets directed at him, since he's a Fish out of Water and all.
- Babies Ever After: At the end of the Island Wars OVA. Although he isn't seen, he is clearly alluded to have sired one with Aila.
- Bad Ass: Practically fearless and is a damn good pilot. He's also able to beat up all of Chairman's bodyguards on his own.
- Back-to-Back Badasses: With Aila's Command Gundam while piloting his Beginning Gundam in episode 16.
- Belligerent Sexual Tension: With Alia.
- Big Eater: To the point where he ducks out on a black-tie party to mow through a sports tournament's worth of snack stalls.
- Brutal Honesty: This kid can't keep his mouth shut to save his life.
- But Now I Must Go: In the finale the Arista crystal on his bracelet breaks, forcing him to go back to Arian.
- Cassandra Truth: Sei does not believe him when he 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 Arian has connections to PPSE and the origins of the Plavsky Particles.
- Chaste Hero: While Sei is shy and awkward, Reiji is downright dense. This is exploited for all it's worth in his interactions with Aila.
- Fiery Redhead: Definitely qualifies as this when behind the controls; and even outside of battling, if his first encounter with Aila is to be considered.
- Fish out of Water: He's doesn't appear to be from this Earth, having no idea what a school is or how outdoor shops work. This is because he's the prince from an alien planet.
- Given Name Reveal: Through Chairman Mashita's Freak Out in Episode 21, his true name was revealed (at least to the viewers) as Aria von Reiji Asuna.
- Graceful Loser: 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.
- Hot-Blooded: Rivals Tatsuya for sheer intensity during Gunpla Battling.
- Instant Expert: 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 Sei's father Takeshi to give him the skills to do so.
- It's Personal: 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.
- Jerk with a Heart of Gold: 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.
- Leeroy Jenkins: 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.
- Moe Anthropomorphism: 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.
- Mysterious Stranger: Very little about his origin is clear when we first meet him, and the story he feeds Sei comes off as Blatant Lies. Turns out it was the truth after all.
- Oblivious to Love: Due to his denseness, he has absolutely no idea that Alia is in love with him. He just thinks she's weird.
- Official Couple: At the end of Episode 21, 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.
- Pretty Freeloaders: 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.
- Red Oni, Blue Oni: The red to Sei's Blue.
- Rebel Prince: He seem much happier adventuring on a foreign planet than staying in his kingdom.
- Requisite Royal Regalia: The gem fitted on his trademark golden bracelet denotes him as the Prince of Arian.
- Royals Who Actually Do Something: He's always ready to help out anyone in trouble, despite being the prince of Arian.
- Supernatural Gold Eyes: They officially fall into this trope after he's outed as the Crown Prince of Arian.
- Unskilled, but Strong: 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.
- Warrior Prince: Reiji's the crown prince of Arian, extremely competent in gunpla battles, and capable of knocking out an entourage of bodyguards single-handedly.
- Will They or Won't They?: With Aila. In the end of Episode 21, They Do 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.
- The Worf Effect: Gets hit with this in Episode 20 when he tries to intervene a berserk Aila's No-Holds-Barred Beatdown on Ricardo's Fenice with his Beginning Gundam. With a few swipes from Aila's spear, Reiji's Gunpla is shattered to pieces.
- Worf Had the Flu: He was piloting an unmodded standard kit that lacked the build quality and special features the Star Build Strike has.
Voiced by: 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.
- Audience Surrogate: She knows very little about Gunpla, making her one of the main targets for in-show explanations about Gundam models and TV series.
- Apologetic Attacker: In the final episode, she almost frantically apologizes for cutting down her enemies, even with them being Mecha-Mooks.
- Badass Adorable: Her Bearguy once it's in action.
- Bears Are Bad News: Beam saber emitters in its rounded arms instead of default beam guns, and Bearguy III is more than capable of making angry expression.
- Beary Friendly: Her custom Acguy, Bearguy, looks like a cute teddy bear.
- Class Representative: She's the rep of Sei's class at school.
- Crush Blush: Exhibited this when being egged on about Sei. Particularly if it's done by Sei's own mom.
- Escalates into Luminescent Blush territory, particularly in episode 16 after having declared that she would personally cheer him on while he rebuilds his heavily-damaged Star Build Strike.
- Color Failure: With Sei and his mother, upon seeing Aila in a Modesty Towel in episode 22.
- Cute Machines: The Acguy mobile suit was already considered somewhat adorable by fans. Adding teddy bear motifs just makes the robot cuter.
- Distaff Counterpart: 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.
- Expressive Mask: 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.
- Giant Waist Ribbon: Her Bearguy has a big red ribbon for a backpack. According to the model, it's actually a SEED-style Striker Pack, which means the Bearguy can potentially use any Strikers — maybe even the Universal Booster!
- Improbable Weapon User: 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.
- Meganekko: Wears a pair of glasses.
- Nice Girl: Is friendly and polite to just about everyone she meets, including her self-proclaimed rival Caroline Yajima.
- Pink Means Feminine: Wears a pink top for most of the series.
- Red Oni, Blue Oni: The blue to Aila's red.
- Scary Shiny Glasses: Her glasses turn pure, spooky white when she becomes distraught over Sei's apparent interest in Kirara. It happens by default in her family store as well, which weirds out the customers.
- Tareme Eyes: Indicates her friendly, Adorkable personality quite well.
- The Un-Smile: The result of her father asking her to be a bit friendlier to the customers. He then tells her to be herself, Scary Shiny Glasses and all.
- Will They or Won't They?: With Sei. But as it turns out in the Blu-Ray edition extra scene, They Do.
- Zettai Ryouiki: Grade A. All her clothes have a short skirt and stockings, leaving only a thin strip of skin on her thighs visible.
Voiced by Takuya Sato
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
Main Gunpla (Prequel manganote ): RX-93-B Nu Gundam Brave, RMS-116H-B Hobby Hizack Brave, RX-93-ν2-B Hi-Nu Gundam BraveStudent Council President 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...
- The Ace: Already qualified for the previous year's word championships by the start of the series.
- Bad Ass: Goes with being a Char Clone.
- Badass Longcoat: As Meijin Kawaguchi III.
- Badass Normal: 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.
- Becoming the Mask: Defied. 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.
- Blood Knight: 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.
- Brainwashed and Crazy: During Episode 23, after the improved Embody System is forced upon him by Chairman Mashita.
- Cerebus Retcon: 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.
- Char Clone:
- Initially uses a customized version of Char's Zaku II from Mobile Suit Gundam. He even has the nickname Crimson Comet, a play on Char's Red Comet moniker. That nickname is also a reference to a Char Clone from the Super Robot Wars 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 Cool Shades similar to Quattro Bajeena's after taking the alias Meijin Kawaguchi.
- Guns Akimbo: 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.
- Gun Fu: Happens whenever one of his suits whips out a pair of pistols. Which is often.
- Honor Before Reason: During the Battle Royale 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.
- Hot-Blooded: Is incredibly passionate when it comes to Gunpla Battling.Yuki: Burn brighter! And brighter! And brighter! Gunplaaaa!! (He quotes the 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."
- Jumped at the Call: Downplayed. He's reluctant at first to take on the identity of Meijin Kawaguchi, and almost seems 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.
- Kinetic Weapons Are Just Better: Unusually for this franchise, the Zaku Amazing exclusively uses these rather than the conventional Energy Weapons. 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.
- Knife Nut: The Zaku Amazing uses a pair of vicious-looking heat machetes in close combat rather than the typical Laser Blades or the iconic Heat Hawk. The Kämpfer Amazing uses actual heat khukris.
- Legacy Character: His Char Clone 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.
- Large Ham: 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, Exia! TRANS-AM!
- Lightning Bruiser: 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 Char colors.
- Man in White: His PPSE uniform, which is only visible after he sheds his Meijin garb.
- Mid-Season Upgrade: Upgrades from his Zaku Amazing to a customized dark blue Kämpfer Amazing in episode 7. Then upgrades to the Amazing Exia in Episode 22. Then upgrades to the Exia Dark Matter the following episode.
- Mr. Fanservice: There's that long pan of him in very tight clothes while working out at the gym in Episode 15...
- Multi-Ranged Master: 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 gatling gun.
- Nice Guy: 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.
- He also dons the Meijin name specifically to change its image from that of a Jerk Ass who only seeks victory to someone who loves Gunpla because it's fun and makes people happy.
- Older Is Better:
- His first model is based on a mobile suit from the original Mobile Suit Gundam 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.
- Paper-Thin Disguise: His 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.
- Punny Name: 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 a Meijin?
- Red and Black and Evil All Over: Although he is not evil he does wear a sinister looking red and black uniform during the final match of the Tournament due to being Brainwashed and Crazy 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.
- Red Oni, Blue Oni: 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.
- The Rival: Serves as Sei and Reiji's first major opponent in Gunpla Battles.
- Simple Yet Awesome: The Kämpfer Amazing is shockingly no-frills for a top-tier Gunpla. It doesn't have a Wave Motion Gun, it's not a Transforming Mecha, 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.
- Sinister Shades: Wears a pair in his Meijin Kawaguchi persona.
- Split-Personality Makeover: Played for Laughs. While normally laid back, he slicks his hair back whenever he reveals his Hot-Blooded side during Gunpla battles.
- Student Council President: Of Seiho Academy. Also Club President of its model kit club. To which, when he assumed the Meijin title, he candidly denies. (See below.)
- Suspiciously Specific Denial: 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. His impeccable knowledge of the person he supposedly isn't does not go unnoticed.
- That Man Is Dead: 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.
- Walking Armory: The Kämpfer Amazing's detachable Amazing Weapon Binders contain... well, an amazing amount of weaponry, like handguns, submachineguns, sniper rifles, gatling guns, and 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 Logical Weakness that plagues most walking armories - the Binders contain additional thrusters, meaning they enhance the Kämpfer's speed and manoeuvrability rather than reducing it.
Voiced by: Yuuichi Nakamura
Main Gunpla: XXXG-01WF Wing Gundam Fenice, Wing Gundam Fenice RinascitaAn Italian gunpla fighter and an infamous casanova. Despite his sometimes less than adult behavior, he is a very competent fighter and builder.
- Bad Ass: Don't let the womanizing and beat up Gunpla fool you. He is the Italian Champion, after all, he can throw down with the best of them.
- Beta Couple: 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.
- Bifurcated Weapon: The buster rifle has a standard beam rifle mounted underneath and the two can be used independently.
- Big "OMG!": See entry under Gratuitous Italian.
- Bunny-Ears Lawyer: 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.
- Combat Pragmatist: While not a dirty fighter, he WILL use nearly any means to win.
- Cool Bike: The mobile vehicle the Fenice uses resembles one.
- He also rides a pretty snappy looking Vespa.
- Crouching Moron, Hidden Badass: He might be a bit of dorkish idiot and Casanova Wannabe IRL but his opponents know to never underestimate him in battle. There's a reason he's Italy's champion.
- Can't Hold His Liquor: Which does nothing to help with his Casanova Wannabe problem.
- Casanova Wannabe: 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 offscreen though.
- The Charmer: How does he hit on ladies? By giving them a Gunpla and comparing it to them.
- Chick Magnet: 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.
- Deflector Shields: 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.
- Fashionable Asymmetry: His Wing Gundam Fenice is much fancier on its left side than its right. Purposely done according to the HG manual. Does away with this after rebuilding it as the Rinascita.
- Friendly Rival: 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.
- Gratuitous Italian: Will randomly break into his native Italian, despite being fully fluent in Japanese.Ricardo: Oh dio mio!
- Latin Lover: 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.
- Luminescent Blush: The Gundam Fenice Rinascita gets one when Kirara's Gerbera Tetra glomps it in Episode 23. 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..."
- Mentor Archetype: For Reiji, who he helps train to become a better Gunpla battler.
- Meaningful Name: 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, Gundam Fenice Rinascita, Italian for "reawakening" or "reborn", after he rebuilds Fenice into its new form. Also a little lampshade hanging of a Lawyer-Friendly Cameo, given that Rinascita is essentially Fenice with strong Reborns Gundam influences.
- Red Baron: "The Italian Dandy."
- Scars Are Forever: 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.
- Shoulder Cannon: The Fenice has a large beam gun built into its right pauldron.
- Sore Loser: After getting defeated by Aila, he prepares to deliver a last 'screw you' by activating the Fenice's self-destruct system, only for 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.
- Taking You with Me: Attempted to use Fenice's Self-Detonation device during its losing battle against Qubeley Papillon. Kirara apparently calls him out of it.
- Transforming Mecha: Subverted. Fellini ignores the Wing Gundam's transformation gimmick, using the extra parts to build his Meteor Hopper. Until it's rebuilt as the Wing Gundam Rinascita.
- Weak, but Skilled: 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.
- When All You Have Is a Hammer: 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 "partner."
- Worthy Opponent: How he and Reiji regard each other.
- Wouldn't Hit a Girl: Averted in his fight with Aila, but seemingly played straight in Episode 23 with his free battle against Kirara.
- Youthful Freckles: Flashbacks in episode 15 shows he used to have them.
Voiced by: Minami Fujii
Main Gunpla: GX-9999 Gundam X Maoh, XM-X9999 Crossbone Gundam MaohA 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.
- Bunny-Ears Lawyer: The kid is an amazing model-builder, but he apparently thinks he can pay for goods and services with his models.note
- Camp Straight: 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.
- Chest Blaster: The abdomen-mounted Satellite Cannon on the Crossbone Maoh, hidden behind the giant skull's mouth.
- Cool Hat: Wears one with an X mark (see pic, and "X" Makes Anything Cool entry)
- Cosplay: Mao imagines himself dressed as Garrod Ran during his imagination fight with Sei and Build Strike.
- The Engineer: Sei even admits that Mao is a better modeler than him.
- Eyes Always Shut: Usually.
- Fan Disillusionment: Think highly of Fellini at first, then sees his appalling drunken PUA skills. His hangover the next day doesn't help much either.
- Giving Someone the Pointer Finger: While declaring that he had gotten over his angst from his loss against Sei and Reiji.
- Heir to the Dojo: 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.
- Large Ham: 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!
- Likes Older Women/Precocious Crush: He has a rather obvious crush on an older girl who works at an inn.
- Loophole Abuse: 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.
- The Rival: For Sei in Gunpla building.
- Theme Naming: His two Gunplas both have XNote and "Maoh" on their names.
- Villain Forgot to Level Grind: 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. He fixes this with the Crossbone Maoh.
- Wave Motion Gun: 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. The Crossbone Gundam Maoh has a similar cannon hidden inside the skull on its chest.
- The Worf Effect: In episode 22, he is annihilated effortlessly and off-screen by the newly-arrived Julian Mackenzie and his F91 Imagine.
- "X" Makes Anything Cool: The mark on his hat, and both his main GunplaNote .
- Yin-Yang Bomb: 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. Both are used simultaneously to power its ultimate weapon, the Maoh Sword.
Voiced by: Shinnosuke Tachibana
Main Gunpla: 侍ノ弐 Sengoku Astray GundamA 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.
- Alliterative Name: His first and last names both start with a Ni-.
- Absurdly Sharp Blade: Sengoku Astray's swords can cut through beam sabers.
- Awesomeness by Analysis: 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.
- Badass Bookworm: 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.
- Becoming the Mask: He initially viewed Gunpla and the tournament as a means to further his goals, but during his battle with Sei and Reiji he truly gains a passion for it.Nils: The next time we battle, I'll definitely win!
- Berserk Button: 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 Hot-Blooded in the ensuing second round.
- Black and Nerdy: He's African American, has 3 scientific doctorates, and an obsession with Samurai culture.
- The Comically Serious: 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.
- Color Failure: In Episode 19, when Caroline starts calling him her boyfriend.Nils: Boyfriend?! Am I the Boyfriend?!
- Combat Pragmatist: 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 Hot-Blooded players thin themselves out. In episode 19, he even meets with Sei and Reiji to suggest he lose to them on purpose. Sei was having none of it.
- Common Mary Sue Traits: His father is a detective, his mother knows martial arts, he has a black belt in karate and judo, has gone to America's top university, has three PhDs, can manipulate Plavsky particles to their full use, and is only thirteen. Oh yeah, and he curb stomps a twenty year Gunpla vet.
- Chrome Champion: 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.
- Defeat Equals Friendship: Becomes noticeably more relaxed and friendly after Episode 19, and joins Mao in hanging out with Sei and Reiji in-between matches.
- Dual Wielding: His Sengoku Astray can wield two Katanas via its shoulder arms, while its actual arms are focused on using Fa Jin.
- For Science!: 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.
- Gratuitous Japanese: The Sengoku Astray's "model number" is 侍ノ弐, (Samurai no Ni), which literally means "Samurai's 2nd".
- I Am Not Left-Handed: If you think the Sengoku Astray will be helpless without its katanas, then prepare to be crushed with a single palm strike infused with Plavsky particles.
- Improbable Age: He's only 13 and already has three scientific doctorates.
- In-Series Nickname: Early Genius and Samurai Boy; the latter doubles as his Red Baron name during the tournament.
- Multi-Armed and Dangerous: 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 I Am Not Left-Handed by maintaining a Badass Arm-Fold 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.
- Not So Above It All: He has zero tolerance to weirdness that happens In-Universe and often stumbles speechless, such as the fact that Plavsky particles react to cotton or Caroline declaring him as her boyfriend.
- Also around the time of his match with Sei and Reiji, 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. His signature pose is even the "Samurai Hello" and his custom Astray is based on Samurai. Mr. Bushido would be proud. 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.
- Shout-Out: A subtle shout out to Nils Nilsson, a renowned American professor at Stanford University and researcher of artificial intelligence, among his other contributions to other fields of science.
- Straw Vulcan: 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.
- Sword Beam: Sengoku's Katanas can make these to deflect beams and to attack opponents with.
- Supernatural Martial Arts: Nils incorporates the principle of "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.
- Teen Genius: Has earned three PhDs in Particle Physics, High Energy Physics, and Euclidean Space Physics by the age of thirteen.
- Think Nothing of It: In Episode 12 he pulls a Big Damn Heroes 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.
- Token Minority: And here's our resident black guy!
- When All You Have Is a Hammer: Nils has never equipped his prized gunpla with anything other than two katanas, which are all the weapons it needs.
Voiced by Saori Hayami
Main Gunpla: NMX-004 Qubeley Papillon, SDV-04HWG Command Gundam, AC-01 Miss SazabiThe top fighter in the Finland-based Gunpla team Nemesis. She hails from the Flana Institute.
- Animal Motif: Butterflies.
- Attack Drone: Her suit is based around using dozens of remote controlled "beam funnels" to attack opponents.
- Babies Ever After: At the end of the Island Wars OVA. The nameless girl whose Arista crystal caused the disturbance is her daughter (and by extension, Reiji's).
- Back-to-Back Badasses: With Reiji's Beginning Gundam, using her SD Command Gundam in episode 16.
- Badass Arm-Fold: Her newly-built Miss Sazabi appears in this pose before it launched in Episode 25.
- Belligerent Sexual Tension: With Reiji.
- Beneath the Mask: Underneath her icy, detached shell is an unbridled passion for food. She is also tired of being used by Team Nemesis as a tool to win them Gunpla tournaments.
- Big Eater: Buys up nearly all of the confectionery at the Gunpla World Tournament market. This, naturally, puts her in conflict with fellow Big Eater Reiji. It's heavily implied that her love of food comes from an impoverished background.
- Blush Sticker: Gets a set in episode 22 when Rinko accepts her into her household so that she can "get close to Reiji".
- Cannot Spit It Out: Notwithstanding the fact that she's been hanging out with Reiji after their battle, she still could not express her true feelings for him, even after wishing through the Arista to be with him at Arian.
- Cherry Tapping: 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.
- Curb-Stomp Battle: She uses a Jegan to beat the Devil Gundam Gunpla used by a member of Nemesis. Then she completely crushed the previous year's world champion.
- Curtains Match the Window: Has both white to silver-ish eyes and hair.
- Cuteness Proximity: Two words: GOOD FOOD.
- Dark and Troubled Past: Before Aila was inducted into the Flana Institute, she lived in poverty as an orphaned child. Nine Barthes exploits this to have her compete in Gunpla battles.
- Distaff Counterpart: 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 Big Eater like Reiji is, which leads to a Meet Cute.
- Earn Your Happy Ending: She gets hers in Episode 21 after enduring a... less-than-idyllic childhood and poor treatment from Team Nemesis. Moreover, when 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.
- Emotionless Girl: Subverted. She behaves this way when Gunpla matters are involved, but it becomes more and more apparent that it's an assumed shell. 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 Super Soldier Tyke Bombs with emotional issues in other Gundam series, like Lalah Sune, Four Murasame, Ple Two, Soma Peries (who she physically resembles) or Allenby Beardsley (who also has fondness for food and Scandanavian nationality).
- Le Parkour: Uses it to try and get away from Reiji in Episode 10.
- Mythology Gag: She's from the Flana Institute, a play on the Flanagan Institute from the classic Gundam series.
- Modesty Towel: Appears in one in Episode 22, as she comes out of the bathroom in Sei and Reiji's room.
- Not So Stoic: Her icy, detached persona as a fighter tends to drop away when she's around food or people who try to keep her from her food.
- The end of Episode 21 sees her totally abandon any trace of stoicism due to her quitting Team Nemesis.
- Official Couple: At the end of Episode 21, 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. This is cemented by the Island Wars OVA when it's revealed that she and Reiji have a daughter.
- Proper Tights with a Skirt: Her outfit includes a short dress and black pantyhose.
- Rags to Royalty: Aila had a terrible childhood, growing up in Finland as an orphan and being exploited by Nine. As of the Island Wars OVA, however, it is clearly alluded that Aila is now married to Reiji (Arian's crown prince) and is seen at the end with her and Reiji's daughter.
- Rapunzel Hair: Waist-length
- Red Oni, Blue Oni: The red to China's blue.
- Secret Identity: 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 Aina.
- Shout-Out: Two, regarding her main Gunpla:
- The Qubeley Papillon had elements of Detonator Orgun integrated to the base Qubeley's design.
- While the Miss Sazabi (the first one she made after leaving Team Nemesis) had, apart from design cues from the Nobel and Infinite Justice, a redesigned head unit that made it look like a white Gunbuster. In fact, before it launched in episode 25, it used the same pose◊ as the latter.
- Stay with the Aliens: When Reiji is forced to return to Arian, she uses her Arista crystal to go with him.
- Sugar and Ice Personality: A lot more emotional than she appears in front of her minders.
- Super Senses: She can actually sense the flow of Plavsky Particles. This gives her a huge edge in Gunpla battles because she can literally see what her opponent is going to do next. She is essentially a Build Fighter version of a Newtype.
- Super Soldier: Technically, she's more of a Super Sportswoman, but she's designed to be the greatest Gunpla pilot on Earth.
- Super Strength: Appears to be one of her enhancements - she's performed acrobatic feats that would tear an ordinary human's limbs off.
- Take This Job and Shove It: Deified. She ultimately does this toward Team Nemesis in Episode 21 once Reiji gives her a long-awaited opportunity to leave by promising her a spot in Sei's house.
- Trademark Favorite Food: Not exactly official, but a lot of fanart (and even some official merchandise of hers) portray her love for Meat Buns. 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 himnote .
- Lampshaded by a track on the OST, which is titled "Aila - Reiji's Custom Tsundere."
- Tsurime Eyes: An attribute that comes with her being a Tsundere.
- When She Smiles: Aila is already quite pretty, but when she smiles it's truly a wondrous thing.
- White Hair, Black Heart: Parodied. She's a championship-level Gunpla battler, but has no interest in the Gundam series or Gunpla in and of themselves. What she really likes is food.
- Will They or Won't They?: With Reiji. In the end of Episode 21, They Do in the most hilarious, heartwarming, and spectacular way possible.
- Wingding Eyes: When near food in episode 15.
- Zettai Ryouiki: A variation. Wears thigh high boots and a short dress, leaving a thin strip of her black pantyhose visible.
Voiced by Takuya Eguchi
Main Gunpla: AbigorbineThe top fighter from Thailand, and a former baseball player.
- The Ace: When he played baseball, he had a batting average of 89.9%; to put that into perspective, earlier that episode Ral says that a normal batting average is around 30%. In regards to his piloting skills, Ral says Dallara's abilities are on par among the likes of Char Aznable, Johnny Ridden and 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 "SUPER PILOT" for nothing.
- Friendly Rivalry: Of course he wants to win, but he still likes Sei and Reiji and respects their talents and makes sure they understand that.
- Genre Savvy: Is the first one to spot the weakness of Build Strike's Discharge system, and utilizes it.
- Spirited Competitor: 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!"
- Shout-Out: His suit is a mix of Abigor from Victory Gundam and Dunbine.
- The Worf Effect: In the Stinger for episode 17, Reiji and Sei are shocked to see Luang has been thrashed effortlessly by the Renato Twins.
- Worthy Opponent: Before their match, he greets Sei and Reiji to say that he watched all their fights and highly respects their abilities.
Mario and Julio Renato
Voiced by: Yuji Ueda
Main Gunpla: MSM-03C Hygogg, TMF/A-802 BuCUE Tank, RGM-79K9 GM Sniper K9Twin brothers who represent Argentina in the Gunpla Battle World Championship. Mario is the team builder, while Julio is their fighter.
- Always Identical Twins: They're twins whose only difference is the direction they wear their identical haircuts. (Mario's hair sways left, Julio's right.)
- Awesomeness by Analysis: 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; this ultimately lets them win because they know when Discharge Mode is about to run out.
- Which is ironic since Yuuki was able to predict them placing bombs on his Gunpla's joints by studying their last battle.
- Badass in a Nice Suit: Both wear dress suits during Gunpla battles.
- Curb-Stomp Battle: All we see of their fight against Luang is the latter's Gunpla shredded to pieces. We get to see how in Episode 18.
- Cold Sniper: They're arrogant and icily businesslike, treating Gunpla fights like actual warfare, and favour sniping and ambush tactics.
- Combat Pragmatist: They're highly creative tacticians, using everything from decoys and tripwire explosives to tiny plastic soldiers carrying explosives to flush their enemies out, keep them off-balance, and destroy them.
- Friendly Rivalry: 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.
- Jack-of-All-Trades: They use dozens of different Gunpla to fit any given match, only switching to their main model in the final championship tournament.
- Mythology Gag: They both look like Kai from the original Mobile Suit Gundam.
- One-Man Army: 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.
- Robot Dog: Their backpack can transform into a robot dog suit with a sniper rifle for a head.
- Serious Business: People tells them that they're taking Gunpla way too seriously with their tactics. This is from people who already treat Gunpla as Serious Business.
- Super Mode: The GM Sniper K9 is fitted with the Blue Destiny's EXAM System, serving as a nasty surprise for anyone trying to engage them in close-quarters combat.
- Talking to Themself: Both brothers are voiced by the same voice actor, Yuji Ueda.
- Theme Twin Naming: Mario sounds similar to "Mayo" ("May" in spanish) and Julio means "July".
- Weak, but Skilled: 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.
- Subverted when they reveal the EXAM System, which allows the GM Sniper to out-speed the Kämpfer Amazing.
Voiced by: Ryo Hirohashi
Main Gunpla: YMS-15SS Gyan, YMS-15SS GyanGyaGyan, YMS-15SS Gyan VulcanOne of Sei's neighborhood acquaintances, and apparently a skilled Gunpla battler... Although he's more on the destructive side of the sport.
- The Bus Came Back: He returns in Episode 23.
- Crazy Jealous Guy: Hates that Sei fights with Reiji instead of him.
- Dual Wielding : His GyanGyaGyan dual wields shields of all things. Do note that the Gyan shield fires missiles, making it less silly than it sounds.
- Dude Looks Like Alady: Looks like a girl, talks like a girl, having the mannerisms of a girl... well... and Screams Like a Little Girl too.
- Gatling Good: 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" 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.
- Jerk Ass: Like rubbing his victories in his opponent's faces.
- Joke Character: He fulfills this role in the series, which is why people forget that he's actually a pretty good fighter in his own right.
- Moe Anthropomorphism: Played with. his haircut and jacket (especially the buttons) make him look like a cute kid version of his suit of choice, the Gyan.
- Punny Name: GyanGyaGyan. "Jyanjyajyan~!" is the japanese equivalent of "ta-dah!"
- Put on a Bus/Demoted to Extra: Becomes this after his defeat.
- Sci-Fi Bob Haircut: Which he attempts to ''flip'' during his debut appearance.
- Yandere: Wants Sei to be his partner in gunpla battles, and yet thinks he can get Sei to join him by destroying Sei's models in battle.
Kirara / Mihoshi
Voiced by: Aoi Yuuki
Main Gunpla: AGX-04 Gerbera TetraAn up-and-coming idol singer who entered the battle tournament in order to further her dreams.
- Bare Your Midriff: In her idol outfit, her belly is left completely exposed.
- Becoming the Mask: 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.
- Beta Couple: With Fellini by Episode 20.
- Bitch in Sheep's Clothing: 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. She actually put laxative in the tea so she could scratch up Build Strike's joints while Sei ran to the bathroom.
- The Bus Came Back: 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.
- Cheaters Never Prosper: 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.
- Christmas Cake: 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
- Combat Pragmatist: 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.
- Composite Character: Combines design elements from Meer Campbell, Tiffa Adill and 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 Wang Liu Mei mixed in.
- She also has similarities with Saki Rukino and Akira Renbokoji, 2 female characters from Valvrave the Liberator 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.
- Curtains Match the Window: 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.
- Easily Forgiven: 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.
- Heel–Face Turn: 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.
- Honey Trap: Pretends to be interested in Sei so she can damage his Gunpla in episode 4.
- Girlish Pigtails: As Kirara.
- Lady in Red: During the ball in episode 10. While her dress fits the part, her attempts to act sultry fall rather flat.
- More Dakka: 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).
- Pink Means Feminine: Has pink hair as a idol and uses a pink Gerbera Tetra.
- Qipao: Her party dress is a tight-fitting, dark red, Chinese-style dress.
- Rapunzel Hair
- Took a Level in Kindness: After Episode 6, she's a significantly nicer person.
- Who Wears Short Shorts?: Her idol outfit.
- Worthy Opponent: 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.
Voiced by: Chiwa Saito
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 Unknown Rival, a fact that she is painfully pissed at.
- Always Second Best: No matter how talented she is and no matter how hard she tries, Caroline could never beat China in an art competition.
- Berserk Button: 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.
- Blush Sticker: there are always two pink circles on her cheeks, regardless of her expression.
- But Not Too Foreign: Her father's Japanese while her mom's a Westerner. The only thing that really sets her apart from the other Japanese kids in the series is her blonde hair.
- Cool Horse: The horse Nils can be seen riding in the second ending is hers.
- Embarrassing Nickname: Doesn't like it when China calls her "Caro-chan" instead of Caroline.
- Gratuitous French: Drops it occasionally; "oui oui," and "adieu!"
- Noblewoman's Laugh: "Ohohohoho!"
- Not So Above It All: 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.
- No Sense of Personal Space: Towards Nils in some instances; she even snuck up behind him the day before his match with Sei and Reiji.
- Mixed Ancestry: Has an Asian father and Caucasian mother.
- Multiethnic Name: Caroline (European) Yajima (Japanese).
- Ojou: Her father owns a multi-national conglomerate.
- Ojou Ringlets: Has four of these, with a couple more at the back.
- Tempting Fate: In the final battle, Ral and Master Chinnan make their entrance and Caroline says that "the tide has turned". Cue Wave Motion Gun destroying thousands of Mecha-Mooks.
- Tsundere: She gets easily flustered around China.
- Unknown Rival: She considers China to be her Worthy Opponent, a fact China is oblivious to.
- Wacky Marriage Proposal: A variation: While Nils was 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?
- Seven years later, it looks like she followed through on that.
- Zettai Ryouiki: Type C.
Voiced by: Nobutoshi CannaA 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.
- Ace Custom: All of his Gunpla are painted in his signature blue and red colors. Not that it helps their performance in any way.
- Arch-Enemy: Considers Fellini his.
- Butt Monkey: He quickly starts losing his battles in increasingly humiliating fashions.
- The Chew Toy: Since Felinni is one of the protagonists, the audience is encouraged to laugh at Rainer's increasingly humiliating defeats.
- Fiery Redhead
- Heartbroken Badass: Tries to be this when facing Fellini, with a HEAVY emphasis on tries.
- It's Personal: Has sworn vengeance against Fellini for the latter having stolen his girlfriend during last year's competition.
- Ocular Gushers: Happened a lot in episode 23 where he kept losing over and over.
- Red Oni, Blue Oni: The red to Fellini's blue.
- Revenge Before Reason: Doesn't even try to advance in the tournament, instead focusing all his attentions on trying to take down Fellini.
- There Is No Kill Like Overkill: 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.
- Villain Decay: 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 inglamerously 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 Alfred Izuruha.
Main Gunpla: F91 Gundam F91 ImagineA 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...
- Ace Pilot: 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.
- Lightning Bruiser: The F91 Imagine. It's so fast, the Amazing Exia has to use Trans-Am to keep up with it.
- Refusal of the Call: He was a shoo-in to be Meijin III, but Julian left because he disagreed with Meijin II's win at all cost philosophy.
- Punny Name: Like Amazing, Imagine when pronounced with a Japanese accent sounds very similar to Meijin.
- Retired Badass: Quit gunpla three years ago, and is only now coming back because his grandfather begged him to replace him.
- Take Up My Sword: A variation, in that the gunpla his grandfather wants him to use is actually his.
Voiced by: Subaru Kimura
Main Gunpla: PPMS-18E Kämpfer AmazingChief Engineer at PPSE. He serves as Meijin Kawaguchi's right-hand man, providing him the necessary info and resources he needs for the tournament.
- Benevolent Boss: All the other engineers under Allan at PPSE seem to like him. He's also not happy with the Mega Zaku's interference, which is probably why he doesn't discipline Meijin for helping stop it.
- 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.
- The Engineer: Built Meijin Kawaguchi's custom Kämpfer Amazing, and designed and supervised the Amazing Exia.
- Energy Weapon: the Kämpfer Amazing he designed uses numerous beam weapons, despite Meijin's former preference for the Kinetic kind.
- First-Name Basis: With Yuuki.
- Guy in Back: Becomes this for Meijin in the match against the Renato brothers and Julian Mackenzie, serving as his flight engineer.
- Hot Scientist: Is Chief Engineer at PPSE, and an extremely good looking one at that.
- Limited Wardrobe: Is only ever seen in his PPSE Engineer uniform, even when off-duty.
- Mission Control: Serves as this for Meijin Kawaguchi.
- Reasonable Authority Figure: Willing to side with Meijin over his superiors when push comes to shove, despite being a major employee at PPSE.
- Red Oni, Blue Oni: The calmer blue to Meijin's secretly hot blooded red.
Voiced by: Tetsuo SakaguchiThe owner of the company producing both the Plavsky Particles and Gunpla models. He seems to know Reiji and bears a grudge against him.
- Affably Evil: He is pretty childish and friendly, when he's not trying to do sinister things to get Reiji out of his hair.
- Ambition Is Evil: 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.
- Big Bad: He's the one pulling the strings in the world tournament arc to get Reiji out of the championships.
- Big Bad Wannabe: 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.
- Biting-the-Hand Humor: Rumor has it he's based on a certain Bandai executive who doesn't care for Gundam and prefers Tokusatsu properties.
- Cool Car/Absurdly Long Limousine: In Episode 16 we see that he owns Dorothy Catalonia's gold limo.
- Cut Lex Luthor a Check: 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 mind control applications for the plavsky particles are discovered, but he shoots down the idea of using it to 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.
- Dark Secret: He is the only person who knows how to manufacture Plavsky Particles. The main reason he's gunning after Reiji is to stop him from revealing the information to the world.
- Evil Counterpart: of Reiji. They both have little ambition and just cares about self satisfaction, and is friends with a much smarter Gunpla Fan. They are also both from Arian, although Mashita is a mere criminal.
- Harmless Villain: When it's brought up that he could brainwash people into doing his bidding, like with Meijin Kawaguchi III, and use this to Take Over the World, 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 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.
- Karma Houdini: 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.
- Non-Action Big Bad: All he does in the series is order people to get rid of Sei and Reiji. When confronted, he's absolutely helpless.
- Rags to Riches: Was a petty thief in Arian, who managed to found PPSE and use the giant Arista for Gunpla battle.
- The Reveal: In Episode 24, we find out the reason why he's willing to do anything to stop Reiji from winning the tournament. 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.
- Revealing Cover-Up: Everything he does to get Reiji and Sei kicked out of the competition just draws more and more attention to himself.
- Screw the Rules, I Make Them!: How he justifies sending a giant Zaku after the Star Build Strike.
- Villainous Breakdown: 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. 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.
- Villainous Friendship: with Baker. As it turns out, they founded PPSE together.
Voiced by: Natsuki AikawaChairman Mashita's secretary. She tends to the Chairman's needs and carries out any of his requests without question.
- Cosplay Otaku Girl: Mashita first met her when she was cosplaying as Sayla Mass. Plus she's the knowledgeable one when it comes to gunpla and Gundam.
- The Dragon: Serves as Big Bad Chairman Mashita's right hand woman.
- Dragon-in-Chief: She practically does all the work and thinking for him.
- Evil Counterpart: To Sei. Like Sei, she is a hardcore Gunpla fan and first ran into Mashita while she was cosplaying Sayla Mass. She is also a partner of someone from Arian.
- Face Fault: Her expression at the end of episode 19 after seeing the Sei-Reiji duo defeat Nils.
- Four Eyes, Zero Soul: When enemies of the Chairman are concerned.
- Genre Savvy: Expected Nils to attempt to breach PPSE's facility to discover the secret of Plavsky particles.
- Hyper-Competent Sidekick: 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.
- Only One Name: She's just Baker. No first name given.
- Scary Shiny Glasses: Hilariously, she gets this during her Villainous Breakdown in episode 11.
- Sexy Secretary: Serves as the secretary of the head of PPSE, while also being a very attractive woman.
- Sharp-Dressed Man: Can always been seen in an attractive blue business jacket and skirt number.
- Stay with the Aliens: 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.
- Undying Loyalty: 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. And when Mashita is returned to Arian, she unhesitatingly goes with him.
- Villainous Friendship: with Mashita. As it turns out, they founded PPSE together.
Main Gunpla: Hell Zeong Marine, Hell Zeong GalaxyA 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.
- Combat Tentacles: The Hell Zeong Marine is built with a huge set of these for legs.
- Evil Is Petty: 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.
- Fatal Flaw (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.
- Mysterious Mercenary Pursuer: Little is known about him other than him being hired to make Sei and Reiji lose the race period during the championships.
- Sinister Shades: He's never seen without them.
- The Voiceless: He only talks to Baker over the phone but we never hear what he had said.
Voiced by: Kotono MitsuishiSei's mother and owner of her family's model shop.
- Color Failure: With Sei and China, upon seeing Aila in a Modesty Towel in episode 22.
- Date Peepers: 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!"
- Ms. Fanservice: Mr. Ral has a thing for her.
- As do the show's producers. And the viewers. And especially the fan artists.
- Shipper on Deck:
- 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 Beach Episode.
- As of episode 22, she also seems quite supportive of Aila's feelings for Reiji.
- Supreme Chef: Supplemental data reveals that she's quite a cook, with vegetable stir-fry as her trademark dish.
- Sweater Girl: usually wears a yellow one. And she certainly wears it well.
- Wingding Eyes: Gets these whenever she gets excited about Sei and China's relationship.
Voiced by: Tokuyoshi Kawashima (Japanese) and Seth Leslie (English)
Main Gunpla: RX-78-2 Gundam, PF-78-1 Perfect GundamSei's father and previous runner-up of the second Gunpla Battle Tournament. Is currently tending to Gunpla-related activities overseas.
- The Ace: Came in second place in the first Gunpla Battle world championships. And he's a pretty competent hand-to-hand fighter too.
- Ace Pilot: 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.
- Badass: Placed second in a Gunpla Battle World Championship, piloting the RX-78-2, and handed C his ass on a silver platter. Well, porcelain urinal.
- Combat Referee: Is an official PPSE ref, and busts "C" after he interferes in Reiji and Aila's casual battle.
- Disappeared Dad: At the start of the series, he is off abroad.
- Drill Sergeant Nasty: 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!"
- Happily Married: 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.
- His reunion with his family in Episode 23 is a thing of heartwarming feels.
- Like Father, Like Son: 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?"
- Men Can't Keep House: 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.
- Older Is Better: Used a classic RX-78-2 Gundam from the original Mobile Suit Gundam anime.
- When All You Have Is a Hammer: He came in second place in the world tournament with his RX-78-2 and only this model.
- Wig, Dress, Accent: Disguises himself with a beard in Episode 16.
- Wingding Eyes: Gets stars in his eyes whenever he's talking about or explaining how to build Gunpla, just like his son.
Voiced by: Masashi Hirose
Main Gunpla: MS-07B Gouf, MS-07BR35 Gouf R35A 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 Gundam Build Fighters Try, he's the coach of Seiho Academy's Gunpla Battle Club.
- Berserk Button: Do NOT mess with a legitimate Gunpla Battle. He will fight you if you do.
- Breakout Character: He's based off Ramba Ral, a Villain Of The Week back in Mobile Suit Gundam. Now he's a recurring character.
- Celebrity Paradox: It's not entirely clear if he's just really into Cosplay or actually a version of Ramba Ral from Mobile Suit Gundam, 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.
- Character Tics: His butt itches at the slightest hint of Ship Tease.
- Combination Attack: With Master Chinnan.
- The Dreaded: No one who knows him dares to cross him. Even a Japanese gangster / land shark like Tatsuzo the Burning.
- Hopeless Suitor: Has a rather obvious crush on Rinko, Sei's mother, but the fact that she's Happily Married 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.
- Joke Character: His Best Mecha Collection Gouf, a suit from a line of super low quality models. He has a much nicer High Grade Gouf, but he doesn't battle with it.
- Last Name Basis: Only goes by "Mr. Ral", no first name given. Until Takeshi calls him Ramba.
- Lethal Joke Character: 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.
- Let's Get Dangerous: In the final episode.
- Kinetic Weapons Are Just Better: His Gouf R35 sports a pair of five-barreled arm cannons instead of beam weapons.
- Offscreen Teleportation: Has a tendency to suddenly appear wherever a gunpla battle is taking place, be it the official arena, or in the Iori household.
- Mr. Exposition: If there's any info to mention, it'll usually be said by him.
- Red Baron: His nickname is The Blue Giant.
- Serious Business: Gunpla Battles.
- Shipper on Deck: Some people misinterpreted his protective nature towards Sei's mom as Ship Teases, 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.
- Talking Is a Free Action: Averted. He spent too much time talking to Reiji that his Gouf gets defeated by him.
- Veteran Instructor: To the Gunpla Battle Club in Try.
- Younger Than They Look: 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.
Voiced by: Minoru Inaba
Main Gunpla: GF12-035NH/GF13-001NH Kowloon Gundam, GF13-001NHII Master GundamGrandmaster 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.
- Boke and Tsukkomi Routine: His revealing of who his favorite female Gundam character is treated as one with him as the boke and Mao as the Tsukomi.
- Combination Attack: With Mr. Ral.
- Cool Old Guy: Is an aged Buddhist monk, but enjoys building Gunpla and competing in Gunpla battles.
- Dirty Old Man: When asked by Mao who his favorite female Gundam character is, his thoughts immediately go to Murrue Ramius and her penchant for Gainaxing. Not to mention he owns figurines of a number of famous Gundam heroines.
- Expy: Of 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.
- Let's Get Dangerous: In the final episode.
Voiced by: Daichi Endō
Main Gunpla: NMX-004 Qubeley Papillon, PPGN-001/DM Gundam Exia Dark MatterAila's manger, mission control, and trainer.
- Faux Affably Evil: Before 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 when she refuses to finish her opponents.
- Four Eyes, Zero Soul: He wears glasses and has no qualms in increasing the output for the Embody System. See the tropes below for further details.
- Knight of Cerebus: Whenever he gets focused on, expect the show to take a sharp turn into serious territory.
- Lack of Empathy: 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 Aila's particle reaction time to 99.7%, he utilizes it anyway.
- Manipulative Bastard: He forces Aila to undergo treatments and endless training, threatening to toss her out in the streets if she refuses. Keep in mind that Aila is an orphan.
- Mind Rape: 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: Aila and Yuuki.
- Mission Control: For Aila. Usually points out what the enemy is doing and issues battle plans.
- Only in It for the Money: 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.
- What Happened to the Mouse?: He's nowhere to been found or mentioned in Episode 25.
Main Gunpla: ZGMF-N222 Nya-Nyaia GundamA character introduced in the Build Fighters Amazing side manga, she served as Tatsuya's personal maid when he was seven years old.
- Cry into Chest: Yuuki did this to her back when he was seven when 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. Worst mistake of my life...
- Cuteness Proximity: 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.
- The Ditz: What she acts likes most of the time.
- Innocent Innuendo: Mentions to Tatsuya that it would be grateful if they ever did "that..." The next few frames continued this trope 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.
- Obfuscating Stupidity: 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.