Our main protagonist and actually The Lancer of the team, Eiji is a hot-tempered school boy who is looking for his missing sister Ayaka, only to find himself recruited into the Earthgertz as one of the Gran Knights of Sandman. He ends up being the 'voice of reason' to the clueless main pilot Touga, due to them being boys.
- Achilles in His Tent: In the first season, after Touga attempts to Shoot the Dog and kill Cecile along with the Zeravire of the week.
- Foil: To Touga.
- Get a Hold of Yourself, Man!: Gives one to Touga in Zwei.
- The Lancer: To Touga. If he wasn't, Touga wouldn't have learned restraint in combat to prevent casualties in the first place.
- Master of Disguise: Can disguise as a woman believably enough to get other men to flirt with him, much to his chagrin. He even uses actual prosthetic breasts to help things.
- Red Oni, Blue Oni: Red to Touga's Blue, being more emotional and hotblooded than the more reserved and polite Touga.
- Restraining Bolt: Part of the reason he was brought in as a Grand Knight was because they did such a good job raising Touga to fight at the exclusion of nearly everything else, that Touga didn't know how to avoid casualties and collateral damage when actually fighting, and the other Knights were too into the I Did What I Had to Do mentality to even think of getting him to stop, or just didn't know any better either.
- Supporting Protagonist: He's the protagonist, but Touga's the leader.
- Vitriolic Best Buds: With Luna. Eiji rarely ever misses picking on Luna for being too violent or hotheaded for a woman (and she returns it by pointing out his moments of stupidity) and they tend to argue A LOT. But when push comes to shove, Eiji still considers her one of his best friends.
- Wholesome Crossdresser: Eiji ends up wearing a dress quite often over the course of the series(at least twice of his own volition), and is always pretty chill about it.
The main pilot of Gravion, Touga has been raised since childhood for the job, handpicked from his original orphanage by Sandman himself. He lived a sheltered life, therefore came off as naive and clueless on many things, but he had a good heart.
- The Ace: Trained all his life since childhood to pilot the Gran Kaizer and the Gravion. This is NOT a good thing, in spite of how polite and well mannered he is.
- Chaste Hero: Not really by choice, but mostly because he doesn't QUITE get romance yet due to his unusual upbringing.
- Child Soldier: All his life he was raised just to fight the Zeravire. One of the reasons why Eiji was brought into the fold was so he could have contact with another boy his age and help actually socializing in contexts outside of what he's used to in the castle. The other being because Eiji serves as a living Restraining Bolt to keep Touga from losing himself in fighting. Because he's so polite and well mannered, he just seems like a naive but pleasant airhead at first, his deeper issues not actually apparent.
- Deuteragonist: The show's other main character, after Eiji.
- Raised by Wolves: In episode 5 after stepping out of Saint Germain Castle with Eiji to visit the city, he shows just how isolated he has been from contact outside of the castle with how clueless he is regarding society, specially with how he doesn't seem the least bit perturbed by Eiji's method of sneaking out of the castle by dressing in drag AND using prosthetic breasts.
- Genius Ditz: Touga is an extremely skilled mecha pilot and commander... and also a complete airhead.
- Gone Horribly Right: At the beginning, he would focus solely on destroying opposing Zeravire unites and nothing else, not even so much as considering avoiding collateral damage or casualties. He nearly got Cecile, one of the younger maids, and Eiji, who is basically HIS BEST FRIEND, nearly killed during a zeravire attack because he wouldn't hold back on attacking while Eiji rescued Cecile from danger in the middle of a fight. It wasn't out of malice, he just didn't know any better because his training didn't cover anything BUT combat.
- The Hero: As the pilot of the Gran Kaiser, he is this despite not being the actual main protagonist.
- Princely Young Man: In spite of being clueless regarding normal human contact, he's always soft spoken and polite.
- Red Oni, Blue Oni: The Blue to Eiji's Red, being the more disciplined and focused of the two, at least in combat. In social situations, he's more polite and reserved than Eiji, who looks very crass in comparison, but not without warmth.
- Talking to Himself: With Lelouch Lamperouge and Luca Angelloni in Super Robot Wars Z2.
One of the two pilots of G-Driller that eventually forms up the arm. Luna is an energetic Okinawan girl that came to Sandman's group while looking for her missing father, which turned out to be one of the identities of Raven.
- Genki Girl
- Little Miss Badass: She's 14, just so you know. And yet, she's really fiery when it comes to battle.
- Rocket Punch: She's the go-to pilot that gets literally launched whenever Gravion uses the Graviton Pressure Punch. She handles it much better.
- Talking to Herself: With Aoi Hidaka in Super Robot Wars Z2.
- Tsundere: Type A for Eiji, Type B for Touga.
One of Sandman's many-many maid and also another pilots of the G-Driller. Ena is more or less reluctant about battles, but did her best to maintain between fighting Zeravire and taking care of the castle. She's actually a prototype version of the machines that formed up the Gravion (Gran Divas), built in 50 years by Sandman. After committing a Heroic Sacrifice, she was put back in her original body and rejoined as if nothing happened.
- Heroic Sacrifice: To save Touga, in Zwei.
- Proper Lady: In sharp contrast to her copilot.
- Rocket Punch: Sometimes she gets literally launched for Graviton Pressure Punch. Unlike her copilot, however, Ena usually doesn't take it well, screaming out of her lungs whenever launched. Not even changing to her old body fixed that.
- You Gotta Have Blue Hair: Green, and later pink.
The token adult of the Gran Knights, Mizuki is an incredibly busty lady, a skilled hacker and overall reasonable individual who was a friend of Eiji's sister Ayaka and was also looking for her, though she likes to get knocked on beer. She's the pilot of G-Striker, forming one of the legs.
Or so it seems. Mizuki is actually a spy of the EFA, leaking the development info of Gravion so the Federation could catch up technology-wise, which led to the creation of Gran Troopers. She's not too pleased with her boss' aim for upgrade to be more or less one-upping Gravion out of pride, instead of combining their strength together, which disgusted her post retirement and made her return to the Gran Knights.
- Boobs of Steel: far bustier than the other female grandknights and is the only one with any kind of hand-to-hand combat skills.
- Cool Big Sis: She is by far the big sister figure of the Gran Knights, since she's the token adult. Likewise, she's highly looked up by Faye as her big sis.
- Everyone Has Standards: When she completed her job as a spy, she was given a luxury residence to retire. But she doesn't exactly like the president she was spying for bragging on how the Gran Troopers built from her information was made to one-up the Gran Knights after a lot of time Gravion helped defending the Earth, she wanted her information to be used so the EFA can catch up and actually be of use in defending Earth, like being an equal to Gravion.
- Gag Boobs
- Hard-Drinking Party Girl
- Hidden Depths: If you get past her overblown fanservice elements, Mizuki is actually a little more insightful than you think. Read the spoilers peppered around her tropes to see why.
- The Mole
- Ms. Fanservice: Sole adult, gigantic boobs, alluring voice. Mizuki is the shining example of Obari female fanservice.
- Obfuscating Stupidity: Part of her Hard-Drinking Party Girl image is an elaborate act to hide she's very good with computers and an EFA intel officer.
- Unresolved Sexual Tension: Has a hefty amount of this with Eiji, who gets to see her rarely shown serious side, and whom she hits on repeatedly, both in private and in public.
- Pigeonholed Voice Actor: Yuu Asakawa as a Ms. Fanservice with large breasts. Surprising, eh?
- Voiced by: Houko Kuwashima (JP), Allison Keith (EN)
A shy young girl that was holed up in one of the towers in Sandman's castle, with them being close and she had a pet ferret named Lolotte. Leele is the pilot of G-Shadow, a stealth plane that could turn into a boomerang and formed up Gravion's chest. Her parents died in a fire, and thus she has a fear towards fires... especially blue ones... Hm?
Turns out, that's not what her origin was like. Leele is actually the daughter of Zieg Zeravire AKA Sandman. The destruction of her planet in blue flames horrified her so much that she lost her memories and afterwards she was put on a stasis capsule and sent to a capsule, but arrived in a latter time after the arrival of Sandman. Afterwards, she had to fabricate a new past, such as being Sandman's niece... until her past came knocking.
- Heroic BSoD: After learning that Sandman is her father, and she is an alien.
- Human Aliens
- Mysterious Waif
- Shrinking Violet: She's chronically shy and had a hard time opening up with others due to a traumatic past about 'her parents died in a fire'. Of course, that's not her exact past...
- Why Did It Have to Be Snakes?: Blue Flames. It was a hint that her past isn't as it was publicly stated.
- You Gotta Have Lavender Hair
Klein Sandman (Zieg Zeravire)
- Ascended Fanboy: Definitely seems like it.
- Cain and Abel: The Abel to Hyugi's Cain, due to marrying the latter's sister.
- Death Seeker
- Heroic BSoD: In Zwei. Ayaka!Raven snaps him out of it.
- Human Aliens
- I Always Wanted to Say That: He always wanted to introduce the titular mecha in an awesome way; he gets to.
- Ignored Expert
- Immortality: He is at least four hundred years old, but is implied to be much, much older than that. He loses this at the end of the series, though, when he activates the Gran Sigma.
- Large Ham
- Leele I Am Your Father
Raven (Ayaka Shigure)
- Becoming the Mask: Anyone wearing the Raven mask gains access to the memories of past Ravens.
- Bifauxnen: This one, at least.
- Char Clone
- The Comically Serious
- Cool Mask
- Drill Sergeant Nasty: Especially from Eiji's perspective.
- Legacy Character: The present Raven is Eiji's sister Ayaka, the one before was Luna's father; it dates back to Sandman's assistant on his home planet.
- Transferable Memory: His mask.
Faye Lin Xu
- Voiced by: Saeko Chiba (JP), Stephanie Nodolny (EN)
- Voiced by: Kenyuu Horiuchi (JP), George Manley (EN)