! Eiji Shigure
-->'''Voiced by:''' Creator/KenichiSuzumura (JP), Creator/ChrisPatton (EN)

* AchillesInHisTent: In the first season, after [[spoiler:Touga attempts to ShootTheDog and kill Cecile along with the Zeravire of the week]].
* {{Foil}}: To Touga.
* GetAHoldOfYourselfMan: [[spoiler:Gives one to Touga in Zwei.]]
* TheLancer: To Touga. If he wasn't, Touga wouldn't have learned restraint in combat to prevent casualties in the first place.
* MasterOfDisguise: 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.
* RedOniBlueOni: Red to Touga's Blue, being more emotional and hotblooded than the more reserved and polite Touga.
* RestrainingBolt: 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 IDidWhatIHadToDo mentality to even think of getting him to stop, or just didn't know any better either.
* SupportingProtagonist: He's the protagonist, but Touga's the leader.
* WholesomeCrossdresser: 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.

! Touga Tenkuji
-->'''Voiced by:''' Creator/JunFukuyama (JP), Creator/GregAyres (EN)

* TheAce: 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.
* ChasteHero: Not really by choice, but mostly because he doesn't QUITE get romance yet due to his unusual upbringing.
* ChildSoldier: 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 RestrainingBolt 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.
* RaisedByWolves: 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.
* GeniusDitz: Touga is an extremely skilled mecha pilot and commander... and also a complete airhead.
* GoneHorriblyRight: 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. [[spoiler: 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.]]
* TheHero: As the pilot of the Gran Kaiser, he is this despite not being the actual main protagonist.
* PrincelyYoungMan: In spite of being clueless regarding normal human contact, he's always soft spoken and polite.
* RedOniBlueOni: 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.
* TalkingToHimself: With [[Franchise/CodeGeass Lelouch]] [[TheChessmaster Lamperouge]] and [[Anime/MacrossFrontier Luca Angelloni]] in ''VideoGame/{{Super Robot Wars Z}}2''.

! Luna Gusuku
-->'''Voiced by:''' Creator/HarunaIkezawa (JP), Creator/LuciChristian (EN)

* GenkiGirl
* TalkingToHerself: With [[Anime/DancougarNova Aoi Hidaka]] in ''VideoGame/{{Super Robot Wars Z}}2''.
* {{Tsundere}}: Type A for Eiji, Type B for Touga.

! Ena
-->'''Voiced by:''' Creator/MaiNakahara (JP), Creator/JessicaBoone (EN)

* [[spoiler:BackFromTheDead]]
* [[spoiler:HeroicSacrifice: To save Touga, in Zwei.]]
* {{Meido}}
* ProperLady: In sharp contrast to [[{{Tsundere}} her copilot]].
* [[spoiler:RidiculouslyHumanRobots]]
* [[spoiler:SuperPoweredRobotMeterMaids]]
* YouGottaHaveBlueHair: Green, [[spoiler:and later pink]].

! Mizuki Tachibana
-->'''Voiced by:''' Creator/YuuAsakawa (JP), Creator/KiraVincentDavis (EN)

* BoobsOfSteel: far bustier than the other female grandknights and is the only one with any kind of hand-to-hand combat skills.
* GagBoobs
* HardDrinkingPartyGirl
* [[spoiler:TheMole]]
* MsFanservice
* ObfuscatingStupidity: Part of her HardDrinkingPartyGirl image is an elaborate act to hide [[spoiler: she's very good with computers and an EFA intel officer.]]
* UnresolvedSexualTension: 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.
* PigeonholedVoiceActor: Creator/YuuAsakawa as a MsFanservice with large breasts. [[SarcasmMode Surprising, eh?]]

! Leele [[spoiler:Zeravire]]
-->'''Voiced by:''' Creator/HoukoKuwashima (JP), Allison Keith (EN)

* HeroicBSOD: After learning [[spoiler:that Sandman is her father]], and [[spoiler:she is an alien]].
* [[spoiler:HumanAliens]]
* MysteriousWaif
* [[YouGottaHaveBlueHair You Gotta Have Lavender Hair]]

! Klein Sandman ([[spoiler:Zieg Zeravire]])
-->'''Voiced by:''' Creator/ShowHayami (JP), Creator/JasonDouglas (EN)

* AscendedFanboy: Definitely seems like it.
* {{Bishonen}}
* [[spoiler:CainAndAbel: The Abel to Hyugi's Cain, due to marrying the latter's sister.]]
* [[spoiler:DeathSeeker]]
* HeroicBSOD: In Zwei. [[spoiler:Ayaka!]]Raven snaps him out of it.
* [[spoiler:HumanAliens]]
* IAlwaysWantedToSayThat: He always wanted to introduce the titular mecha in an awesome way; he gets to.
* [[spoiler:IgnoredExpert]]
* [[spoiler:{{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.]]
* LargeHam
* [[spoiler:[[LukeIAmYourFather Leele I Am Your Father]]]]

! Raven ([[spoiler:Ayaka Shigure]])
-->'''Voiced by:''' Creator/HikaruMidorikawa (JP, Raven), Creator/VicMignogna (EN, Raven), [[spoiler:Creator/MichikoNeya (JP, Ayaka), Kim Prause (EN, Ayaka)]]

* [[spoiler:BecomingTheMask: Anyone wearing the Raven mask gains access to the memories of past Ravens.]]
* [[spoiler:{{Bifauxnen}}: This one, at least.]]
* CharClone
* TheComicallySerious
* CoolMask
* DrillSergeantNasty: Especially from Eiji's perspective.
* [[spoiler:LegacyCharacter: 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.]]
* [[spoiler:TransferableMemory: His mask.]]

! Faye Lin Xu
-->'''Voiced by:''' Creator/SaekoChiba (JP), Stephanie Nodolny (EN)

! [[spoiler:Hyugi Zeravire]]
-->[[spoiler:'''Voiced by:''' Creator/KenyuHoriuchi (JP), George Manley (EN)]]

* [[spoiler:BigBad]]
* [[spoiler:CainAndAbel: The Cain to Sandman's Abel, if only by marriage.]]
* [[spoiler:EvilKnockoff: As the name would suggest, his Zeravion is a Zeravire equivalent to the Gravions.]]
* [[spoiler:EvilUncle: He's Leele's.]]