Our heroes from left to right: Jo, Tetsuya, Yusuke, Megumi, and Jun-ichi.
AKA Red Falcon. A Poor student of Academia. When Kenji, Gou, and Rui had joined up with a terrorist unit called Brain Army Volt, Yuusuke swore to destroy them for the loss of two of his four friends, not to mention the destruction of the entire college.He's also the representative Red Sentai in the crossover Gaorangers vs Super Sentai
Hidden Depths: Not that hidden, given his school, but he doesn't leave the impression early on that he could build his own mecha (and he seems to be aware of it).
Idiot Hero: Begins as a Hot-Blooded rebel but grows into the role of a dependable, courageous leader. note The actor had a freewheeling playboy image as a singer, and relished the opportunity to prove that he could do 'serious'. You really could see the difference between his early self and his self in Gaorangers vs Super Sentai.
AKA Yellow Lion. A fun-loving, confident sportsman who, like Yuusuke, is low on his grades. He enjoys Skateboarding as well as the welfare of his dog. Although Gou had joined the Volt army, Jou clung to the times he and Gou were friends.He's also the team representative in episode 30 of Kaizoku Sentai Gokaiger, and one of only two major returning heroes from the Showa era.
AKA Blue Dolphin (the first female Blue Sentai Warrior). The lone female, and more serious member of the group. She can be fussy, and get into quarrels with the guys, but she has a heart of gold, and help them in battles whenever possible - when she's not kicking ass on her own.
If It Swims, It Flies: Averted, her Aqua Machine can travel in water, and on land. . . but never in the air. It can still make high, dolphin-like jumps out of the water - and judging by the Live Robo's Super Live Crash, can hover as well.
Image Song: "Spark! Umi e," which is sung by her own actress above. note Mori was also a singer until Liveman. It's even used as a plot point in #26.
Annoying Arrows: Is a skilled archer, but the Brain Beasts tend to have hides too thick to pierce. As such, she tends to shoot from such a close range that No Arc in Archery applies by default, and even then it's only effective about half the time.
Zettai Ryouiki: Grade A, but the blue jacket she wears early on subverts the image a little.
AKA Black Bison. A skilled boxer, he is obsessed with getting revenge on Dr. Kemp for killing his older brother - and initially has teamwork problems as a result.
Took a Level in Badass: Given that he's the youngest of the five and that there wasn't much to show that he could do this, it's very surprising to see him continuously destroy Guildos' personal Guild-zuno until Guildos himself basically self-destructs from the strain of reviving him.
Brain Army Volt:
The members of Volt: Gash, Dr. Obular, Prof. Bias, Dr. Kemp, and Dr. Mazenda.
Great Professor Bias
The leader of Volt. He believes that humanity should be ruled by the intelligent. Far from being a Card-Carrying Villain, he encourages and motivates his subordinates to learn from their mistakes and increase their intelligence.
The Ageless: Has been using the brains he already gathered to prevent aging. However, if he goes too long without renewing it, he will instantly age to his true form.
A God Am I: All but said in the show itself, but this adequately sums him up. He has a truly massive god complex and his true goals seem to be dedicated to satisfy his complex with no care for anyone else. The show is just one long power play on his part.
Alas, Poor Villain: Subverted. He doesn't get any in-universe mourning and his death isn't portrayed sympathetically, and the Livemen and Colon outright celebrate when he dies. Once you remember what he did in the final arc, his death becomes more karmic than sad.
Benevolent Boss: He's probably the nicest of the Showa Big Bads. Except it's all an act.
Big Bad: Obviously. Notably, the protagonists are aware of him but don't know what he looks like until the penultimate episode, where Yuusuke bursts into Bias' Brain Room and demands to know if he's Bias. He fires a beam at Yuusuke, who puts a sword into him in return.
The Chessmaster: Manipulates all of the villains save for Gash to further his own goals.
The Corrupter: Kenji and Gou were shown to be as kind as the future Livemen before Bias made them into Kemp and Obular, and Arashi was ultimately revealed to be a Jerk with a Heart of Gold in contrast to be cold Ashura. And it's ultimately revealed he's done this many, many, many times before.
Evil Counterpart: To all of the heroes. They are all geniuses who extremely value youth, but while the Livemen give it proper respect and accept that it doesn't last, Bias is out to retain his youth using whatever means necessary.
It's Pronounced Japanese: His name is "Bi-ah-su" (rhymes with "Pierce", sorta), not "BAI-ass" as it would be read in English. (It's a deliberate reading of the word as Romaji, as "Bias" is fully pronounceable in Japanese.)
Karmic Death: The man with one of the greatest god complexes in all of Sentai who wanted to maintain his youth ended up dying as an (still completely evil) old man.
Lighter and Softer: Compared to Bazoo, Ra Deus and Lee Keflen, and Zeba, Bias is much kinder, actually showing mercy to his students. Ultimately subverted; those moments were not altruistic at all and were used to further his own goals. Underneath his cover, he's just as bad as those four villains.
Mass Hypnosis: Bias pulls this in the penultimate episode. On Earth. The whole Earth. Only Yuusuke (who's actually inside the Brain Base by that point) and Colon (who's a robot) are unaffected.
Master Actor: He did a really good job at hiding his true self for so long on multiple occasions.
Omnicidal Maniac: He proclaims that he is willing to kill all life on earth to prove his godhood to Yuusuke.
Orcus on His Throne: Justified. Bias is the leader, but Volt's agenda involves his students having to develop and get smarter through their experiments, so Bias generally stands aside. And his true plan also requires this, as he has to maintain a good amount of concentration in order to maintain the Mass Hypnosis.
Redemption Rejection: When Megumi offers him a new chance at life after becoming a young boy, he vehemently refuses so he can grow up to become Great Professor Bias again.
The Sociopath: Any emotions he had shown are fake. He simply pretended to have them in order to manipulate his followers. In addition, he shows other sociopathic traits, such as caring only for himself and becoming more erratic and anxious as Kemp and Mazenda get smarter.
The Unfettered: He will do anything to make sure he gets the twelth brain, no matter how horrible. And he will never give up.
The Unfought: The Livemen never had a true fight with him. Along with the true Big Bad of Timeranger and the final Big Bad of Flashman, Bias is the only final Big Bad to not get an epic final battle.
Villain with Good Publicity: Interestingly, he was one of these among the other villains. Once the villains realized what type of person Bias really was, all of them except for Gash, who knew already, and Kemp, who had went completely insane, turn on him one by one.
Walking Spoiler: He becomes much more interesting and repulsive when we learn more about him.
Not formerly anything. Bias' right-hand robot. In charge of making defeated Brain Beasts grow to incredible sizes with the Giga Phantom. Also has an absurdly powerful Gashgun and a sword, and is by far the strongest fighter in the show.
Alas, Poor Villain: Subverted, for the same reasons as Bias. Has the excuse of being built an evil mother without the breadth of personality Guildos and Butchy had, barely.
Battle Butler: Although he is technically The Dragon - Heavy emphasis on the 'Battle'.
The Brute: He's a super strong robot with little personality and gets little focus. He soon has to share the spotlight with Ashura. In actuality, he's...
The Dragon: After Bias's true nature is revealed, it becomes clear that Gash has been, is, and always will be Bias's one and only Dragon.
Casting Gag: Or something. His V.A., Hideaki Kusaka, was in every Sentai series beginning with Denjiman prior to this one (and almost all of them afterwards), usually as a suit actor, and on several occasions playing the sentai Robot. In a change of pace, this is about the only time he's used purely as a Voice Actor.
Implacable Man: He normally serves as Bias' bodyguard, but when he actually needs to do something, he turns into this. It's particularly noticeable when he's hunting down Mazenda to take her brain; all five of the heroes jumping him doesn't do squat.
Karmic Death: The single strongest character and the most loyal servant of Bias is killed after his arm is cut off and as a direct result of his obedience.
Let Them Die Happy: His final words are him trying to cheer the old, senile Bias up. It ends up making Gash, a robot, more human, while exactly what he says to make Bias happy only serves to make Bias more despicable by showing that even as what he became, Bias is still a soulless megalomaniac.
Make My Monster Grow: Unusually, he also does this, with the Giga Phantom enlargement bazooka(?) which fires out a spiral of enlargement energy... or something. Fridge Brilliance begins to hit once the extent of his power is shown - you begin to wonder just why Bias needs Kemp, Mazenda, and Oblar at all.
On a smaller scale, he also radiates Chaos Phantom Energy onto Zuno-juu cores to create/realize a Zuno-juu.
Nigh-Invulnerability: It's worth noting that he's the single most powerful human-sized thing in the show.
Out of Focus: Unlike Bias and his students, he's just a really strong robot who also enlarges the monsters. Then it's revealed that he's the only one in on Bias's plan... He can be seen in the 'throne' scenes doing something or other. Polishing his Gashgun seems to be a favorite.
Formerly Kenji Tsukigata, Dr. Kemp is a vain and power-hungry man who considers himself Bias' star pupil and can transform into the monstrous Beauty Beast Kemp. Later, he becomes Fear Beast Kemp. Yuusuke's rival.
Alas, Poor Villain: Interestingly, this was initially subverted until Gaoranger vs Super Sentai revealed that Yuusuke did mourn him.
The Dragon: While everyone except Gash is trying to be Bias's Dragon and they're all technically Co-Dragons, Kemp stands out as this. Unfortunately for him, he stood no chance against Gash thanks to Bias's true plan, but at least he was one of the only two Bias thought could succeed, along with Mazenda.
Jerkass: Sure, everyone in Volt except for maybe Gash and Butchy is one, but Kemp is one even for a villain.
Jumping Off the Slippery Slope: He gets crazier and crazier as the series goes on, ultimately losing it after he realizes he was Bias and Gash's pawn the whole time.
Laughing Mad: The second he realizes that he's the only one of Bias' "students" still alive, he starts laughing, while Gash, in the background, trains the Gashgun on him.
One-Winged Angel: His alternate forms: Beauty Beast Kemp and the monstrous Fear Beast Kemp. And finally Kemp-Zuno.
Unwitting Pawn: But unlike the others, learning this doesn't cause him to hate Bias like the other villains. Instead, it drives him even crazier.
Formerly Rui Senda, Dr. Mazenda is a cold-hearted woman who converted herself into a cyborg to eliminate her human emotion and affection. Later upgrades herself to Machine Mazenda, wherein 90% of her body (everything below the head) is mechanical. Megumi's rival, Yuusuke's former crush. Not quite as fanatically devoted to Bias as Kemp or is.
Alas, Poor Villain: Unlike the above three, this was played perfectly straight the moment she died.
Bottomless Magazines: Averted - her built-in weapons all require ammo. (Her (Five) Finger-gun requires her to insert a magazine into her hand, for example, and she's not shown using them continuously.) Yuusuke catches on and exploits this when she upgrades into Machine Mazenda, forcing her to run out.
Crazy-Prepared: When she started having her first real doubts about Bias, she enables her body to become completely mechanical.
More mundanely, she had a Brain Beast standing by with extra ammo during her first appearance as Machine Mazenda.
Cybernetics Eat Your Soul: Played straight at first, and even then she's not completely happy with trading off her humanity for eternal beauty. Subverted later on - she regains some of her humanity only after she becomes fully mechanical to prevent Bias from taking her brain.
Unwitting Pawn: Bias didn't care about her as much as he did about her brain. She seems to have had some inkling of this, and generally isn't as blindly loyal to him throughout the series like Kemp is.
Gou Omura is one of the three transformed ex-students of Academia, he considers his human form to be inferior and mutates himself into the monstrous "perfect lifeform" Obular. He has a major inferiority complex, which motivated his transformation. Jou's rival. Later on, he eventually pulls a Heel-Face Turn and lives to tell about it.
The Atoner: what he becomes after recovering his memory, post-Volt - he seems to have found God by the end, ironically.
Can't Catch Up: He's not actually a born genius like Kemp and Mazenda, getting where he did through hard-ass studying (and got into Volt by applying, rather than being invited like they were).
Education Mama: Has one, but she lightens up after seeing what happened to him and nurses him back to health after he becomes Omura Gou again.
Made of Iron: It's subtle, but he seems to have retained some degree of his former mutated physique - Gash shoots him several times, in the back and at close range, as he tries to protect Mazenda, which he shrugs off.
Mutant: Obular shot himself up with a virus to rebuild himself into Beastman Obular, and is biologically no longer human - and unlike Kemp, he can't change back into human form. (It took getting turned into Obular-Zuno to undo this and he ultimately wills himself back to being human, at the expense of considerable stress on his mind and body.)
Trauma-Induced Amnesia: Suffers from this for a while, as a result of the stress of becoming human again. (20 episodes later, a coincidental run-in with a Brain Beast cures it.)
Unwitting Pawn: During the final arc, it's heavily implied that Bias didn't let him into Volt out of pity, but simply to make Kemp and Mazenda try harder.
Formerly Arashi Busujima, an underworld crime boss. Bias artificially increases his intelligence to transform him into the genius Dr. Ashura, making his brainpower as formidable as his fighting abilities.
Acting for Two: There is a significant gap between Arashi and Ashura's characters that is best described with this trope.
Badass Normal: Arashi is tough enough to fight Brain Beasts to a draw and actually blows one up with a suicide attack.
Empowered Badass Normal: While Bias hates any non-genius, even he found Arashi's strength as something not to be wasted.
The Brute: Shared with Gash, and in a way that takes advantage of his ridiculous intelligence.
Don't Think. Feel: Ashura's weakness is that, ultimately, he thinks his way through his fighting style, as if he's placing a higher priority on outwitting through brute processing rather than simply winning - sort of like calculating for chess when the game's played with D6 dice. He's actually smart enough to get away with it most of the time, but Red Falcon eventually exploits this and beats him.
Dumb Muscle: Arashi is a gang leader, but not because he's smart.
Genius Bruiser: Ashura gets into hand-to-hand combat more than the other two.
Unwitting Pawn: After his death, Bias tells Kemp and Mazenda that this was all he was, used to make them try harder. It's also implied that this was the real reason Gou was let into Volt.
An alien from the technologically-advanced planet of Guild. He joins Volt after hearing of Bias' reputation from across space. Notable for his arrogance and his apparently unlimited life force. Actually a robot built by Bias to spur on his students by acting as a rival.
Asshole Victim: He can't quite believe that he's a robot, and his last few minutes are spent in anguish as he tries to wrap his mind around it (he spends the entirety of the Humongous Mecha fight wandering up a cliff face basically asking "why? WHY?" before exploding - "TELL ME, BIAS!!").
Body Horror: His Robotic Reveal - half his face blowing off, tubes and metal spurting out from his body, and in a nice touch in post-production, his voice gets static-y a second before his body starts failing.
Cast From HP: Can revive specialized Brain Beasts without enlarging them this way, and he has quite a lot of HP.
Tomato in the Mirror: He initially believed himself to have unlimited life force, and found out the hard way that there was something inaccurate about that...
A pig-like alien from the planet Chibuchi who - like Guildos - joins Volt to share his extraterrestrial intelligence and study under Bias. Acts as the Plucky Comic Relief and has an appreciation for Earth music. Also like Guildos, he is a robot built to motivate Bias' students.
Heel-Face Turn: In episode 44, "Butchy's reckless driving of tears!", he is like this after his robot parts appear from within himself, and when he hears "Spark! To The Ocean" being played on a keytar by Megumi - he even protects her from some attacking Jimmas. However, he got remote detonated by Bias, where Megumi could see him die, but not before waving and saying "Farewell" to her.
Tomato in the Mirror: He really has every excuse to not be in his right mind during his last episode.
Unwitting Pawn: Like Guildos, his only purpose was to make Kemp and Mazenda try harder. Unlike the others, he gets told this to his face.
The android ally built by the trio's late mentor, she is capable maintaining the GranTortoise base, as well as provide in-battle assistance to our heroes whenever possible. Although a machine, she carries many human emotions.
Battle Butler: Of a sort, as she takes care of their base and jumps into battle on occasion - more emphasis on the 'Butler' part. She's even blown up a Brain Beast.
Chinese Girl: Her design aesthetic. She even has Odango-like partsnote detachable and officially called "Colon's Bonbon(s)", which she can use to visualize data on her head and her body design has a Qipao thing going.
Guy in Back: Was essentially this during Live Boxer's first combination against Giga Volt, by wiring herself directly into it (to cover for a burned-out circuit).