Voice Actors: Kouji Tsujitani (Japanese), Steve Cannon (English)
The film's protagonist, Seabook Arno is the son of mobile suit and weapons designers Leslie and Monica Arno. Unaware of the full extent of his parents' work, Seabook ends up Falling into the Cockpit of their Super Prototype, the Gundam F91 when the Crossbone Vanguard launches an attack on his home colony.
- Ace Pilot: Reaches this status by his second battle.
- Battle Couple: With Cecily at the end.
- The Everyman: In a sharp contrast to previous protagonists, and his own parents, Seabook doesn't really have any distinguishing characteristics prior to his fateful run in with the titular mobile suit.
- Falling into the Cockpit: Downplayed. Seabook discovers the F91 by accident, but volunteers to fly it, since his mother was the one who designed it in the first place.
- Lightning Bruiser: The F91, as is typical for the protagonist mobile suits. It's faster, harder hitting, and better armoured than anything the Federation or Cosmo Babylonia has at their disposal.
- Nice Guy: Seabook is a fairly pleasant, average kid prior to the events of the film.
- Official Couple: With Cecily, who was his girlfriend before the film began.
- Took a Level in Badass: Takes a massive one over the course of the film going from an average student to a battletested veteran pilot.
- You Gotta Have Blue Hair
Cecily Fairchild/Berah Ronah
Voice Actors: Yumi Touma (Japanese), Michelle Ruff (English)
Seabook's girlfriend, Cecily Fairchild is the daughter of Carozzo Ronah and the granddaughter of Metzer Ronah, both of whom want her to act as the figurehead for Cosmo Babylonia's conquest of the Earth Sphere. Kidnapped and forced into the role, Cecily keeps her own council, and eventually turns against them.
- Aristocrats Are Evil: The only member of her family to avert this.
- Battle Couple: With Seabook at the end.
- Blue Blood
- Evil Redhead: Ultimately averted.
- Extreme Doormat: Early on, when she just does whatever Meitzer, her father, or any other authority figure tells her to.
- Faux Action Girl: Is so thoroughly clobbered by Carozzo one wonders what she was even doing at the battle.
- Grew a Spine: Towards the end of the film she starts to make her own decisions and turns on her father.
- Patricide: Helps Seabook kill her father
Voice Actors: Mari Yokoo (Japanese), Jane Alan (English)
A junior Federation Forces officer, who becomes acting captain of the training ship Space Ark once all of the vessel's senior officers leave to fight the Crossbone Vanguard. Her main role in the film is to get the refugees of Frontier I colony to safety before they get embroiled in the war, even if it meant going against the wishes of Cosmo Eigesse.
- Expy: A junior officer who was the only senior officer left in charge of the ship and eventually having to bear the burden to command the ship along with its crews and refugees, which sounds similar to Bright Noah.
- Fiery Red Head: Complete with a hair clip to boot.
- You Are in Command Now: With the exception to Cosmo Eigesse, she is commanding the training ship as its previous officers went into fighting against Cosmo Babylonia.
Voice Actors: Takeshi Watanabe (Japanese), John Smallberries (English)A former colonel in the Earth Federation Forces, who becomes the leader of the civilian resistance movement after the Crossbone Vanguard attack the Frontier Side. His intention to turn Space Ark into resistance HQ made him an anomisity with the refugees and Leahlee.
- Crouching Moron, Hidden Badass: He may not be a pleasant fellow but he is actually a capable fighter and a tactician. Even managing to down a mobile suit with the resistance cell through fuel barrels and shooting the evacuating pilot with small arms.
- Jerkass/Jerk with a Heart of Gold
- La Résistance: Leader of one on Frontier Colony.
- The Neidermeyer: His wish to draft the refugees and use a training ship as an asset caused frictions with Leahlee and the refugee.
Voice Actors: Teppei Takasugi (Japanese), Simon Isaacson (English)
The leader of the aristocratic Cosmo Babylonia, Meitzer is Cecily's grandfather and Carozzo's father-in-law, and the man who is most to blame for the outbreak of conflict between the EF and the Vanguard. Believing the world is going to run itself into the ground, he aims to save it by imposing his own rule on the Earth Sphere.
- Affably Evil: Meitzer seems like an okay guy, plans to Take Over the World aside.
- Aristocrats Are Evil: Affable though he may be, he's the one who ordered Karozo to come up with a way to kill 9/10ths of humanity, a feat of evil that not even Gihren Zabi ever went so far as to aspire to.
- Big Bad: He's the one in charge, though Carozzo takes up all the screen time.
- Evil Old Folks: Sixty-nine at the time of the film.
- Expy: As the elderly, villainous patriarch of a large aristocratic family who leaves all the fighting to his descendents it's not hard to see him as an expy of Degwin Zabi.
- In fact, Simon Issacson later on voices Degwin in the English dub of the 0079 movies.
- Non-Action Big Bad: Meitzer isn't really up to much fighting, leaving that to the likes of Carozzo, Dorel, and Zabine Chereaux.
- The Patriarch: Of the Ronah family.
- Take Over the World: His end game.
- Well-Intentioned Extremist: Claims to be trying to save humanity from itself.
Carozzo "Iron Mask" Ronah
Voice Actors: Masaki Maeda (Japanese), Tom Wyner (English)
The son-in-law of Meitzer Ronah, Carozzo is the field leader of the Crossbone Vanguard, and a massively augmented Cyber-Newtype as well. Incapable of removing his mask, Carozzo is able to directly interface with machinery at the cost of his interpersonal skills and his basic humanity, with his wife, daughter, and father-in-law all distrusting and fearing him. He pilots the Rafflesia mobile armour.
- All Your Powers Combined: He's got Gihren's knack for delivering the Rousing Speech, has Psychic Powers on par with those of Paptimus Scirocco, uses Attack Drones like Haman Kahn, and takes advantage of Mask Power like Char Aznable. If all that wasn't enough, his Rafflesia is a Humongous Mecha with Deflector Shields, just like Anavel Gato's Neue Ziel. Him and his Mobile Armor are effectively an amalgamation of the UC universe's most dangerous pilots and weapons.
- Archnemesis Dad: To his daughter, Cecily, whom he eventually tries to kill.
- Aristocrats Are Evil: Played with in that he's not truly of noble blood, having married into the Ronah family, yet is by far the most evil of them.
- Attack Drones: The Bugs, Deadly Disc weapons he's had produced en masse to aid him in his genocide plans.
- Ax-Crazy: Between his inferiority complex, seething misogyny, utter lack of regard for the lives of anyone his family deems unworthy of life, he's one of the craziest villains in a Gundam series. Seriously, the dude makes the likes of Paptimus Scirocco and Char Aznable look like pillars of mental health in comparison.
- Batman Can Breathe in Space: Suffers no ill effects when he emerges from the Rafflesia into hard vacuum. It could be that his mask contains an air supply, or that his Cyber-Newtype modifications included some sort of alternative form of respiration, but since neither is specified, this trope is still very much in effect.
- Beam Spam: With the heavily armed Rafflesia.
- Beware the Superman: Probably the single strongest Newtype in the Universal Century, and definitely the stronger Cyber-Newtype. Also ''definitely the most inhuman and monstrous of Newtypes or Cyber-Newtypes.
- Char Clone: He's more like Darth Vader in looks, but he still plays the role of the Char character in the film, with his personal connection to a cast member, Cool Mask, and red mobile armor. In particular his genocide plans and aristocratic disdain cast him firmly as an eviler version of the Big Bad Char from Char's Counterattack.
- Cold Ham: He delivers bombastic lines in a low and eerily mechanical voice.
- Combat Tentacles: His personal mobile armor, the Rafflesia, features these with chainsaw tip. While not as powerful as other weapons, it make up for in overwhelming quantity of them.
- Cool Helmet/Cool Mask: An elaborate steel mask that completely conceals his head.
- Cybernetics Eat Your Soul: Whatever human qualities Carozzo once had, he's lost them since becoming a Cyber-Newtype.
- Cyborg: His feats of strength and surviving the vacuum of space make it clear he wasn't just mentally enhanced.
- Darth Vader Clone: He not only has the look but hits many other aspects of the character, right down to Cecily accusing him of being nothing more than a machine.
- Dragon-in-Chief: Meitzer is the actual Big Bad of the film, but Iron Mask is the true threat to the main cast, and the movie ends with his defeat.
- The Dreaded: Within the Crossbone Vanguard.
- Dude, Where's My Respect?: One of the things that drives him up the wall is how neither his wife nor his daughter respect him. The fact that they rightly fear him for casting aside his humanity never occurs to him.
- Evil Is Petty: He plans to slaughter hundreds of thousands because his wife left him for another man.
- Evil Laugh: He gives off a few during his battle with Seabook and Cecily.
- Inferiority Superiority Complex: It's hammered in that his lingering issues of inferiority over being cuckolded by Theo and abandoned by his wife are what drove him to become a Cyber-Newtype and embrace Meitzer's genocide plans.
- The Heavy: He's the one who drives the plot of the film.
- Immune to Bullets: A sniper's attempt to assassinate him fails when the shot bounces off his mask, and later in the film Cecily tries shooting him repeatedly at close range, to no better effect.
- Knight Templar: A particularly brutal one, who intends to reduce the population of Earth and the colonies by ninety percent so that the human race as a whole can survive on dwindling resources.
- Lack of Empathy: Deliberately abandoned his empathy so that he could do what he thinks he has to do to bring about Meitzer's goals.
- Mighty Glacier: The Rafflesia when compared to mobile suits like the F91.
- Monstrosity Equals Weakness: For all his powers and abilities that he sacrificed his humanity, he also goes out more quickly than just about any other Gundam antagonist before him.
- Psychic Powers: On a level above and beyond even the strongest of Newtypes, despite merely being a Cyber-Newtype himself. His abilities include:
- Mind Rape: Whatever he did to his wife's lover Theo, which was either this or Psychic-Assisted Suicide. Either way, Theo was stone cold dead without Karozo laying so much as a finger on him.
- People Puppets: He was able to paralyze Cecily after physically grabbing her.
- Technopath: Can directly connect to and control his personal mobile armor.
- Super Strength: Able to tear open the cockpit of Cecily's mobile suit using only his hands.
Voice Actors: Takeshi Kusao (Japanese), David Lelyveld (English)
Carozzo's son and Cecily's half-brother, Dorel Ronah was adopted into the larger family by Meitzer when Carozzo married Cecily's mother. Arrogant and determined to prove himself, Dorel acts as one of Meitzer and Carozzo's mobile suit pilots, spearheading the initial attack on the colonies. He has a rivalry with Zabine Chereaux.
- Ace Pilot
- Aristocrats Are Evil: Though significantly less so than his father and adoptive grandfather.
- Blade on a Stick: Seems to favour the lance as a weapon.
- The Rival: Sees Zabine Chereaux as his.
- What Happened to the Mouse?: Does not appear in Crossbone Gundam, nor is he mentioned.note
- You Gotta Have Blue Hair: Purple, actually.