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- Voiced by: Yoshitsugu Matsuoka
- Cassandra Truth: The Cygnus crew don't believe he comes from the past.
- Falling into the Cockpit: After being thrown into the future, he first awakens in the Luxon's cockpit.
- Fish out of Temporal Water: Hailing from 74 years in the past.
- The Hero: Compared to Dio, Aoba is a more traditional kind of hero. His story involves him saving a princess (Hina) from an evil king (Bizon).
- Idiot Hero: Subverted somewhat because he's gotten good as a pilot, but he just couldn't figure out that the Hina he's fighting is NOT the Hina he knew from school until that Hina talked to him.
- Instant Expert: Invoked because the mech he pilots lets him share his knowledge with Dio, who is far more experienced than him. After the coupling is disengaged, he nearly falls out of the sky.
- Midseason Upgrade: To the Luxon Next.
- Nice Guy: Honest, polite and always ready to lay out a helping hand.
- Ordinary High-School Student: At least, that is how his story begins.
Dio Junyou Weinberg
- Voiced by: Kouki Uchiyama
- Ace Custom: He gets to pilot one of the two Super Prototypes the Alliance military is using.
- Ace Pilot: The best pilot in the Cygnus. For the Buddy system to work, Aoba must assimilate his piloting skills.
- Big Brother Instinct: To Fiona, obviously.
- Bishōnen: Considered to be the most handsome pilot in the army, according to the film crew of episode 6.
- But Not Too Foreign: His name and father's appearance hint at the possibility that Dio is biracial and has taken both his father's surname and his mother's maiden name.
- Dark and Troubled Past: He fought in a battle to defend the civilian city where his mother and sister were. The Federation fleet there were completely overwhelmed, his mom died, and his sister was left crippled.
- Deuteragonist: He is stated to be the show's other protagonist after Aoba.
- Green-Eyed Monster: He becomes visibly upset when a new coupler shows up and syncs very well with Aoba.
- Jerk with a Heart of Gold: Over time, he comes to respect Aoba.
- Midseason Upgrade: To the Bradyon Next.
- Teen Genius: At piloting.
- Tsundere: Towards Aoba
- "Well Done, Son!" Guy: He works hard at piloting in order to regain his father's respect, which he lost since his dad partially blames him for the Zogilian's having overwhelmed his fleet and wiped out their home town.
- Voiced by: Saori Hayami
- Action Girl: As expected of a trained soldier.
- And I Must Scream: Thankfully averted thanks to a sudden epiphany on Aoba's part, but she came really close to being trapped in an eternal time paradox where she'd go back in time to save Aoba, lose her memories, become a pilot and meet him again only for the entire cycle to start over.
- Conveniently Seated: She gets the back row window seat.
- Fountain of Youth: When she was separated from Aoba while going into the future, she was turned into a much younger version of herself and lost all of her memories save for her name.
- Girl Next Door: She and Bizon grew up next door.
- Hair Decorations: She wears a cat hairclip that Aoba later holds on to when she seemingly vanishes.
- HeelFace Revolving Door: Hina actually started out her temporal adventures on the Confederation's side, before the time loop kicked her into Zogilia minus (another) eight to ten years and her memories.
- HeelFace Turn: She used to be a member of the Great Zogilian army. Meeting and getting to know Aoba, as well as the way she was treated in the episodes preceding Episode 12, caused her to join him and Dio aboard the Cygnus.
- Hero of Another Story: Actually, she turns out to have been the original heroine of this Story.
- Laser-Guided Amnesia: When she was separated from Aoba when going into the future, she was de-aged and landed about a decade earlier, and could only remember her name.
- Midseason Upgrade: To the Karura.
- Purple Eyes: She has these, as a hint that she's a time traveller from the future.
- Rapunzel Hair
- Single Woman Seeks Good Man: For Aoba, of course. In contrast to Bizon.
- Star-Crossed Lovers: With Aoba. They met and fell in love in college during the original time loop, but Hina was sent to the future and wound up in what later became Aoba's role in the war. She got sent back in time during the final battle and met him again in high school, and the loop was initiated.
- Temporal Paradox: Was caught in one, but Aoba's last-minute realization pulls her out of it.
- Tritagonist: She's the heroine of the series, and the most prominent character after Aoba and Dio.
Confederate Treaty of Liberty Alliance
- Voiced by: Show Hayami
- Cool Old Guy: A funny, relaxed old man and a capable leader.
- Reasonable Authority Figure: Ready to let his subordinates handle a mission if the situation calls for it.
- Shoot the Dog: He would've had Lene take out Aoba, if the latter decided to leave.
- Voiced by: Ayumi Fujimura
- Cold Sniper: Has a sniper rifle and under her captain's orders would have shot Aoba, if he left.
- Pragmatic Hero: She would have shot Aoba if he had left the Cygnus. Although she takes no pleasure in shooting a civillian and is grateful for him saving their lives, the military would be taking a huge risk letting a civillian to his devices while knowing classified information. Fortunately, it doesn't come to that.
- Number Two: Second in command of the Cygnus.
- Voiced by: Tomokazu Sugita
- Voiced by: Hiroyuki Yoshino
- Static Character: Doesn't evolve as his teammates.
- Voiced by: Rina Sato
- Hot Scientist: She has a curvaceous figure, especially noticeable in her labcoat.
- Official Couple: In the epilogue, she marries Lee.
- Voiced by: Kana Hanazawa
- All Love Is Unrequited: Her crush on Aoba.
- Bridge Bunny
- Flat Character: She has a crush on Aoba and is friends with Elvira and Anessa. That's all there is to know about her.
- Voiced by: Marina Inoue
- Flat Character: No distinguishing traits other than her crushing on two of the most handsome pilots in the military.
- Ship Tease: At first, it apeared like she had a crush on Dio. Then when Fromm came in, she was pretty much all over him. In the end, she might just be boy-crazy.
- Voiced by: Ryohei Kimura
- Voiced by: Arthur Lounsbery
- Voiced by: Eiji Miyashita
- Voiced by: Minoru Shiraishi
- Voiced by: Nobuyuki Kobushi
- Voiced by: Yuuki Kaji
- Adaptation Expansion: His backstory is vastly expanded on in the mobile game: he was a war orphan in Zogilia, and was used by Dr. Hahn to perform coupling experiments along with the other children in his orphanage. Many of them died because of it, and he escaped to the Alliance, vowing to stop Hahn at all cost. This casts his decision to stop coupling with Aoba in order to save his coupling ability in a completely new light.
- Bishōnen: Lampshaded by Anessa when he's first introduced.
- Ensign Newbie
- Nice Guy: He gets along with everyone in the Cygnus, even Dio.
- Ship Tease: With Anessa.
- Voiced by: Toshiyuki Morikawa
- Anti-Villain: Among the Zogilian forces, he is THE Reasonable Authority Figure and looks out for those under his command as best as possible and respects the abilities of his enemies. In fact, he is mortified at Bizon's decision to use the Gorgon on his own army.
- Rank Up: Negotiates a peace treaty with the Alliance in the finale, implying he has attained a position in the post-war government.
- Red Oni, Blue Oni: The Blue Oni to Margaret's Red Oni. A military expert, Alfried believes that war is a series of ebbs and flows that can change at a moment's notice, and if anything bad happens, you can always regroup and use it to only get stronger. He also believes that if you do something extremely stupid and can die because of it, you deserved it, though he took exception to this when he saved Margaret.
- The Strategist: A pretty competent one, as shown in Episode 5, throughout the series he borders on being The Chessmaster when it comes to strategy or manipulating other officers to give him more of a edge in most cases, although he does seem to get stuck behind more then one General Failure and has to try to work around their mess to combat the superior Coupler technology.
- Voiced by: Takahiro Sakurai
- Adaptational Heroism: In the mobile game, he teams up with the protagonists to stop Evgeni, his older self.
- A-Team Firing: Deploys practically the entire arsenal of his mech in episode 1, and still fails to hit a kid on a bicycle. Justified because this would generate a time paradox, and hence, prevent the chain of events that led him to the past in the first place.
- Also justified in that Zogilian Valiancers have safety protocols in place that prevent them from targeting unarmed civilians.
- Ax-Crazy: Starts off pretty level-headed, but starts getting worse after he sees Hina visibly trying to protect Aoba from him. Then it gets even worse when he becomes a Coupler with a new mech. Part of it may be due to the experimental technology Dr. Hahn was utilizing in it.
- Childhood Friend Romance: He has known Hina ever since they were children. He is madly in love with her, but she only sees him as a brother figure.
- Crazy Jealous Guy: Towards Hina. It leads to an obsession over killing Aoba.
- Entitled to Have You: He started off decent enough, but after he starts clueing in to how repeatedly Hina keeps running into Aoba, he begins displaying serious shades of this attitude toward her, referring to her as "my Hina" because he's known her for a long time and they're on the same side.
- Forceful Kiss: Gives Hina one late in the series when he realizes he may be losing her to Aoba. She snaps at him to stop and shoves him away.
- Hopeless Suitor: Even with Aoba out of the picture, Hina would never see Bizon as anything more than a brother figure.
- Literally Loving Thy Neighbor: He first met Hina when she and her father moved in next door to his house.
- Midseason Upgrade: To the Nergal.
- Not Good with Rejection: That's putting it mildly.
- Sanity Slippage: He starts off as a pretty nice person, but gradually becomes more and more obsessed with Hina, to the point of considering her "his". It's implied that the painful training that Hahn put him through to couple with Hina was the final straw.
- Taking You with Me: In the first episode, after all his other attempts fail, tries to take Hina down with his mecha's self destruct system.
- Villainous Breakdown: Has one upon finding out that he's an incompatible coupler with Hina and that Aoba is way better at syncing up with her.
- White Hair, Black Heart
- Yandere: His obsessive love toward Hina and his insecurity and jealousy toward Aoba for getting Hina's interest leads to his obsession over killing Aoba, in the process he even hurts Hina and forces himself on her just so he can have her all for himself.
- Yellow Eyes of Sneakiness
- Voiced by: Nobunaga Shimazaki
- Anime Hair: Pointed, unkempt hair.
- Blood Knight: Aggressive, reckless and hotheaded; Tarjim always throws himself into a fight without question.
- Jerk with a Heart of Gold: Despite his lack of patience, Tarjim follows orders and cares for his friends, even if he doesn't show it often.
- Red Oni, Blue Oni: The aggressive and hotheaded red to Lasha's calm and gentle blue.
- Voiced by: Mutsumi Tamura
- Anti-Villain: Rivalring Alfried as the most moral Zogilia soldier.
- Bishōnen: With his androgynous looks and being voiced by a woman, it's easy to mistake him for a girl.
- Nice Guy: Seriously, there is not a mean bone in his body.
- Red Oni, Blue Oni: The calm and gentle blue to Tarjim's aggressive and hotheaded red.
- Voiced by: Yumi Uchiyama
- Attack! Attack! Attack!: Margaret's strategy for combat in Episode 9. Because it fails, she lost her job and almost her life.
- Dirty Coward: While she is quick to give orders, when her life is in danger she will panic.
- Even Evil Has Standards: Is visibly disgusted by the acting commander callously gives orders that endangered the lives of the Zolgilian soldiers in episode 13. When Evgeni goes the same thing, she helps counter the coup and takes the Adminburo down.
- General Failure: When she got a chance to call the shots.
- Hair-Trigger Temper: It's very easy to get Margaret mad or suspicious. Don't even think about flying over her own ship.
- HeelFace Turn: She finds her conscience when Evgeni Gedar (actually an aged Bizon) plans to cause destruction on a planetary scale. She then goes out to help Alfried and the Alliance to stop him.
- Karma Houdini: Granted, she gets screwed over by losing her position but upon helping the good guys stop Bizon from causing the end of the world. The epilogue implies she will have a position of power alongside Alfried in the post-war Zogilia. To be fair, she does own up to her mistakes and the show gives her a more sympathetic portrayal in the finale.
- Nerves of Steel: Inverted. For a secret service agent, she is very panicky.
- Quickly-Demoted Woman: In Episode 9, Margaret loses her position.
- Red Oni, Blue Oni: The Red Oni to Alfried's Blue Oni. Because Margaret is a Political Officer, she wants to see the Alliance crushed at all costs, and finds any failure or mistakes to be unforgivable unless it was by somebody who was extremely loyal to the government. Despite this, Alfried was usually able to get his way, much to her annoyance. She eventually proved not to be a capable leader.
- The Political Officer: Essentially served as this, given her wide authority over Alfreid and his forces, despite being outside of the chain of command.
Nestor Viktorovich Dorzhiev
- Voiced by: Hiroshi Tsuchida
- Ace Custom: His Gwardia S has a torso that's mostly white, instead of black like the rest of the Elite Guard's Gwardias. It also comes with a shotgun.
- This Cannot Be!: He does not take to getting driven away by a mass-production model like the Beryl (piloted by Dio), though he does concede that it makes sense now why Alfried's squad was having so much trouble.
- We Hardly Knew Ye: Despite his high-ranking position in Zogilia, he gets offed after two battles.
Fiona Junyou Weinberg
- Voiced by: Aoi Yuuki
- Big Brother Worship: Dio means the world to her and she always tries to get him to reconcile with her father.
- Ill Girl: Her attack on her home city left her paraplegic.
- Voiced by: Hiroshi Naka
- Insane Troll Logic: He blames his son for the death of his wife and crippling of his daughter because he was a member of the fleet that was defending their home town—one which was simply overwhelmed.
- Jerkass: Gives Dio the cold shoulder and blames him for his wife's death and Fiona's condition, even when Dio did everything he could to protect them.
- Papa Wolf: While he's rather cold to Dio, he clearly cares for Fiona.
- Voiced by: Takahiro Sakurai
- Big Bad: In the post credit scene for episode thirteen, we see that he is an old and very ill Bizon, who apparently has served as one of the highest ranking members of the Zogilian leadership this entire time, and is still hellbent on taking Aoba's life.
- Evil Is Bigger: While most Valiancers are under 20 meters tall, his Karkinos is about 70, so it pretty much eclipses everyone else.
- Evil Old Folks: Bizon didn't die in episode 13; he ricochets into some point early in Zogilia's history where he could easily work his way up to a key position in the Zogilian leadership—all for the sake of eventually killing Aoba, when Dio and Aoba prevent him from going to the past and initiating a Temporal Paradox.
- Die Laughing: Mortally wounded, Evgeni decides to use the Gorgon's reserves to destroy everything the Treaty held dear before dying in a blaze of laughter. It doesn't work.
- Kick the Son of a Bitch: He traps Dr. Hahn inside of the Gorgon, ensuring that he dies.
- Killed Off for Real: At long last in the finale.
- Military Coup: He takes over the Zogilian government right after Hina defects to the Alliance.
- Old Soldier: He's about 90 years old, but he still pilots his own Valiancer in order to fight the main Power Trio of the series.
- The Power of Hate: Coupled with a heaping dosage of Revenge, this is his modus operandi in the finale.
- Sanity Slippage: It was bad enough back when he was Bizon, but now it's taken Up to Eleven: he spent seventy years in the past plotting his revenge against Aoba. And when that didn't work, he tries to pull a Suicidal Cosmic Temper Tantrum by wiping out all life on Earth.
- That Man Is Dead: He took on his new name to avoid suspicion since he gained power around the time his present-day self went MIA.
- Walking Spoiler: He's an old Bizon revealed to have been the Big Bad in order to get revenge on Aoba and Hina; there really isn't anything about him that isn't a spoiler.