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Shunsuke Akagi
Shunsuke Akagi
Voiced by: Kentarō Itō (Japanese), Joey Hood (English)
- Ascended Fanboy: He's wanted to pilot a Humongous Mecha his entire life, to the point of taking an otherwise useless college course to learn how to do it and spending years in a dead-end job just to be around the only one in existence.
- Honor Before Reason: Akagi insists on using Dai-Guard at every opportunity and refuses to accept that sacrifices must be made. Shirota hates this, but it usually works out anyway...meaning nobody dies. Dai-Guard frequently ends up getting beat to hell and back. This tendency is lampshaded in one episode where Akagi doesn't want to destroy a Heterodyne that is sitting quietly and not hurting anyone. Everyone is pretty surprised.
- Hot-Blooded: The boy refuses to realize that he's in a Real Robot Genre show. It all works to his advantage, though.
- Indy Ploy: This is all Akagi does, much to the horror and annoyance of his coworkers.
- No Indoor Voice: To the point of misunderstanding the correct manner of using a TV mic with deafening consequences.
- Ship Tease: Akagi had this with Ibuki but has much more teasing with Ooyama, the final shots of the cast in the final episode even has the two of them standing rather close together as Dai-Guard is repaired.
- Theme Naming: Akagi means "red" in Japanese.
- Two Guys and a Girl: Forms a team with Ibuki and Aoyama.
- Wrong Genre Savvy: In one episode a guy steals Akagi's section of Dai-Guard and tries to attack the Heterodyne, under the impression that it had weapons of its own like in typical Combining Mecha shows. It doesn't, and it has a very limited supply of fuel, so Akagi has to talk him out of it.
Momoi Ibuki
Momoi Ibuki
Voiced by: Akiko Hiramatsu (Japanese), Lana Lesley (English)
- Broken Pedestal: Her father disappeared on a scientific expedition to prove his theory that the Heterodyne were tied to certain earthquakes weakening the borders to a parallel dimension. Momoi believed that he sacrificed his life on a personal mission to warn the world that the Heterodyne threat still existed. When she tells Domeki about this, Domeki (having also read Momoi's father's book on his theory and being a professional scientist herself) believed it more likely that he had no such lofty ambition and just wanted to be proven right in the face of those who laughed at his theory. Ibuki refuses to believe this until Domeki digs up actual video evidence of the Heterodyne attack that sank his ship, wherein Doctor Ibuki can be seen laughing joyously, crowing about how he was right, and walking towards the monster, while everyone else on the ship is panicking and running away. Momoi doesn't take the truth well.
- Daddy's Girl: Ibuki used to be one until her father died in the first Heterodyne attack. When she realizes her biological father only studied the Heterodyne For Science!, she has a Heroic BSoD in the very next battle. When she realizes her stepfather's heroism is real, she's one all over again.
- Heroic BSoD: After she learns the truth about her father.
- Ship Tease: Akagi had this with Ibuki but has much more teasing with Ooyama.
- Theme Naming: Momoi means "pink" in Japanese.
- The Smart Girl: Of the main trio, Momoi counts for this, being interested in science and regularly performing the complex calculations which keep Dai-Guard moving safely.
- Two Guys and a Girl: Forms a team with Akagi and Aoyama.
- Very Special Episode: When Ibuki finds out the truth about her father.
- You're Insane!: Ibuki and Aoyama tend to get really pissed at Akagi's repeated use of the Indy Ploy.
Keiichiro Aoyama
Keiichiro Aoyama
Voiced by: Shin-ichiro Miki (Japanese), Steve Metz (English)
- Brilliant, but Lazy: In a way, his laziness is his brilliance. He's an expert at the finding the fastest and most efficient way to accomplish things, which (with the proper training) makes him an natural at engineering for Dai-Guard.
- Handsome Lech: Though his flirting always seems to have a business purpose behind it. Then, when the office suspects he has a girlfriend because he's always talking on the phone and disappearing, it turns out it's his mom, who's in the hospital.
- I Just Want to Be Normal: It takes Aoyama a long time to get used to piloting Dai-Guard; in episode 3 he quits the company, and in one pre-episode recap, he asks the viewer if they want to fly a giant robot.
- Official Couple: He starts a relationship with Nakahara toward the end of the series.
- Only Sane Man: In one of the early introduction episodes, Aoyama remarks on Akagi and Ibuki's unstable nature and heroic tendencies and declares, "I am the only sane person on this robot, and there's nothing I can do about it, except hang on and enjoy the ride."
- Tall, Dark, and Snarky
- Theme Naming: Aoyama means "blue" in Japanese.
- Two Guys and a Girl: Forms a team with Akagi and Ibuki.
- You're Insane!: Ibuki and Aoyama tend to get really pissed at Akagi's repeated use of the Indy Ploy.
Shiro Shirota
Shirou Shirota
Voiced by: Kenichi Ono (Japanese), Mick D'Arcy (English)
- Heel–Face Turn: Shirota eventually loosens up and comes around to the protagonists' way of thinking.
- Hidden Depths: Turns out Shirota's really good at decorating cakes. Everyone's pretty surprised, not least Shirota himself.
- Repetitive Name: Shiro Shirota
- Screw the Rules, I'm Doing What's Right!: In the series finale Shirou Shirota disobeys orders to stop a Over Explosion Bomb from being dropped on Tokyo to stop the Monster of the Week from covering the world. His plan works, but the bomb might not have.
- Theme Naming: Shirota means "white" in Japanese.
President Ookouchi
President Ookouchi
Voiced by: Takaya Hashi (Japanese), Bill Wise (English)
- The Atoner: During the first Heterodyne invasion Ookuchi was forced to use OE weaponry, blowing up a huge chunk of Tokyo in order to stop the Heterodyne that was attacking it, rendering it still uninhabitable twelve years later. He has dedicated himself to making sure it never becomes necessary to do so again.
- Dark and Troubled Past: He's the guy who authorized using O.E. weaponry against the heterodyne all those years ago.
- 10-Minute Retirement: After the board learns that he was the one who authorized the O.E. attack and therefore that his decision to have the company keep fighting Heterodyne instead of leaving it to the military is seemingly rooted in personal reasons rather than business interests he's briefly taken from his position after a vote of no confidence. However, both he and Dai-Guard turn out to be necessary in the end.
Haruo Oosugi
Shinyu Yokozawa
Noriko Ooyama
Noriko Ooyama
Voiced by: Michiko Neya (Japanese), Christa Kimilicko-Jones (English)
- Cool Big Sis: Ooyama is specifically called out in this role during the Recap Episode.
- Wet Blanket Wife: While she isn't his wife or even girlfriend, she is often concerned about the well being of Akagi, and often nags him about his work and health.
Chiaki Nakahara
Chiaki Nakahara
Voiced by: Marina Ono (Japanese), Shaneye Ferrell (English)
- Clingy Jealous Girl: After she hooks up with Aoyama, she irritably yanks a list of attractive young ladies he's going to interview for a PR project out of his hands and says she'll see that it's assigned to someone else. This, by the way, is how everyone else in the office finds out about their relationship.
- Luminescent Blush: She is very shy and easily flustered.
- Official Couple: She starts a relationship with Aoyama towards the end of the series.
Fuuka Tanigawa
Fuuka Tanigawa
Voiced by: Yukari Tamura (Japanese), Larissa Wolcott (English)
- Genki Girl
- Gossipy Hens: She's tuned in to the rumor mill and has gossip connections even in the military. Though her info isn't always correct.
- Hot Springs Episode: Subverted. Tanigawa and Ijuuen visit one just in time to be interrupted by a giant balloon Heterodyne, but little skin is shown and in Tanigawa's words, they had "separate rooms and boring conversations".
Shizuku Irie
Shizuku Irie
Voiced by: Rumi Kasahara (Japanese), Lane West (English)
- Deadpan Snarker
- Emotionless Girl: She most often speaks in a low, almost emotionless, tone.
Tomoyushi Ishizuka
Tomoyushi Ishizuka
Voiced by: Shoji Izumi (Japanese), Micheal D'Alonzo (English)
- Younger Than They Look: At age twenty-seven, he looks closer to forty.
Tomorou Taguchi
Tomorou Taguchi
Voiced by: Makoto Higo (Japanese), Michael Kranes (English)
- Alliterative Name: Tomorou Taguchi
- Manchild: At age twenty-seven, he's into toys and figurines, and acts rather childishly in general.
Hirotaka Ijyuuin
Hirotaka Ijyuuin
Voiced by: Katsuyuki Konishi (Japanese), Corey M. Gagne (English)
- Hot Springs Episode: Subverted. Tanigawa and Ijuuen visit one just in time to be interrupted by a giant balloon Heterodyne, but little skin is shown and in Tanigawa's words, they had "separate rooms and boring conversations".
- Jerk with a Heart of Gold: Easily the most cynical and selfish of the three large gentlemen, but he still supports Dai-Guard and its mission.
Younei Sumida
Younei Sumida
Voiced by: Hiro Yuki (Japanese), Martin Burke (English)
- Age-Gap Romance: He's got (one-sided?) feelings for Domeki, who's eight years his junior. He's rather embarrassed about it and tries to keep it a secret.
- The Engineer: The head of Dai-Guard's ground crew, who oversees the repair and maintenance of the robot.
- Love at First Sight: He fell for Domeki as soon as he saw her.
Rika Domeki
Rika Domeki
Voiced by: Mayumi Shintani (Japanese), Jennifer Haley (English)
- All Take and No Give: Her "relationship" with Sumida mostly consists of her taking advantage of the fact that she has a trained engineer at her beck and call.
- Didn't Think This Through: She has a company create a weapon for Dai-Guard, but didn't realize she needed to make a proper contract with them, allowing the military to buy it for their giant robot. She more savvy after this.
- Gadgeteer Genius: She doesn't make the gadgets, though, she just designs (and programs) them.
- Girlish Pigtails: Her hairstyle.
- No Social Skills: She means well, and she's generally nice enough in person but she doesn't seem to understand social interaction, and doesn't seem to notice or care when she screws up. "Oh, you think your Dad's a hero? Well, I'd hate for you to labor under a false impression! Let me help you with that. Whoops. Well, that's to be expected. You'll get over it."
- Ramen Slurp: Domeki usually does this while hunched over in her Hacker Cave, analyzing the newest Heterodyne or designing parts for Dai-Guard.
- Smart People Wear Glasses
- Teen Genius: She's only 17 and is the head of the Technology Division, and the company's resident scientist.
- WomanChild: She acts about her half her age when she isn't discussing technical things, as seen when she pleads with Sumida to upgrade her equipment like a spoiled child.
Toru Saeki
Toru Saeki
Voiced by: Tsutomu Kashiwakura (Japanese), Robert Newell (English)
- Heel–Face Turn: Happens with Saeki, Shirota's "apprentice"
- Never Tell Me the Odds!: Inverted when the odds are so bad, Saeki refuses to tell the pilots what they are.
