The main character. A 17 year old student who finds himself piloting the Neuronoid Kakuseijin with Hinoki. While panicky, socially awkward, and caught in circumstances way over his head, Keita manages to show enough courage and wit to survive.
Hidden Depths: He may be jittery, geeky, somewhat pervy, and often needs saving. However, Keita shows great bravery, thinks fast, keeps Hinkoi from falling into despair, and manages to protect others in danger. Its only when there is no way out that Keita needs to be saved by someone else.
Nice Guy: Despite his flaws, Keita is generally likable.
Non-Action Guy: Keita is what you would call... a loaner hero that you use until the real one shows up.
Right Man in the Wrong Place: Why he ends up piloting the Kakuseijin. Also happens outside the mech, such as Episode 8. After discovering the hospital's dark secret, he's the only one that can save Sakura.
Weirdness Magnet: Somehow, someway, he finds himself being confronted by strange monsters or visions. It turns out his Dual-kind capabilities plus the visions are the result of a organ transplant when he was younger.
In another episode, Keita does this to Akamatsu and himself after they get separated from Hinoki and Li-chan. Unable to get back to them, a distraught Keita points out how pathetic it is that "the men ran off and left the women behind".
Faux Action Girl: Hinoki gets torched at, almost eaten by worms, attacked by out of control machines, chased by a bipedal elephant type monsters, and survives most of the show's enemies, before finally being turned into a Damsel in Distress near the end of the series.
Go-Go Enslavement: In the final episodes of the series, Hinoki is tazed by Mamon and later wakes up in the Neuronoid wearing her dive suit, to be used as bait to draw Betterman out.
Heroic Self-Deprecation: Even when she helps save the day, Hinoki still doesn't think too highly of herself. She constantly belittles her own intelligence, saying "I'm just an idiot." It turns out these were some of Mario's (affectionate) last words to her. He followed up these words with saying, "If you ever need me, I'll be there."
Gadgeteer Genius: Has created a number of inventive technologies. Some successful, others not so much:
BFG: Subverted. Akamatsu can wield a massive device that looks like this, but its really a high tech scanner.
Cool Board: A rocket powered skateboard with an automatic jack to allow it to jump in the air!
My Little Panzer: Literally. Akamatsu created a line of remote controlled miniature tanks that actually blew up after taking a direct hit. It was a commercial failure, since the "toy" could only be bought by licensed demolition experts.
Psychic Block Defense: The "Barrier Boy" headbands, which are supposed to protect the user from Algernon. Later, the "Laser Head" headbands are developed to prevent full-on psychic attacks.
Tricked-Out Shoes: Shoes with large springs under them, presumably used to help people jump higher.
Akamatsu: "Never underestimate the cunning of a full grown boy."
Papa Wolf: Cares a great deal for those working under him. Especially Sakura, who is revealed to be his daughter in the final episode.
Renaissance Man: Capable of designing a large number of inventions (from toys to military weapons), as well run his own company.
A cryptic 15 year old girl linked to the "Limpid Channel", allowing her to read the minds of beings around her, and to pick up important information. Also a Dual-kind, she can pilot Neuronoids in a pinch. Unfortunately, due to her poor health she spends much of her time confined to a medical device called the Manage Machine. At the end of the series, it's revealed she is Akamatsu's daughter. He agreed to work with Mode Warp so he could use the Manage Machine for her.
Psychic Radar: Her access to the Limpid Channel allows her to play this role - with it, she's capable of detecting if someone's in trouble, providing information on Betterman, and allowing Betterman to know when it's time to act.
Young, level-headed bio-medical engineer and investigator, providing explanations to the various phenomenon the protagonists encounter. Working for ModeWarp, she acts as the company liaison to Akamatsu Industries. She has dedicated her life to investigating and ending Algernon.
Ms. Exposition: Provides scientific and historical background to the gang when needed.
Not so Above It All: Miyako seems like the last person to make any mistakes, crack a joke, or have any fun. But we do see instances in which these do happen. When a picture of a Christmas Party is shown, a jolly-looking Asami is wearing a goofy fake mustache and red nose.
The Spock: The most calm and logical person in the group. If she does show any fear or anger, there's typically a good reason why.
Technobabble: She provides a good percentage of this throughout the series.
Unwitting Pawn: In the final episode it's revealed that she is in fact a carrier of the Algernon virus, due to being part of the scientific team involved in Yakusugi's ill-fated Dive Inspection - the one that released Kankel into the world.
Cheerful, if subdued, young woman who co-pilots the Neuronoid Tyran. In addition to being a dual-kind, she has psychic abilities that allow her to read electro-magnetic impulses. Kaede also has a close relationship with her co-pilot Shou.
Perpetual Smiler: Downplayed. Kaede often has a smile on her face, but when things get serious or dangerous, her expression does change.
Psychic Powers: Her ability to read electro-magnetic impulses. The Superhuman Federation takes a particular interest in her due to this.
Composed and capable 24 year old co-pilot of the Tyran. He also possesses psychic capabilities, such as precognition. In a relationship with Kaede. Though often collected, Shou does suffer from trauma at times in regards to death of his brother Kei.
Badass: The guy manages to keep his cool and do some awesome stuff during the worse situations. Yanagi hears something approaching, so he grabs a sharp rock and waits to ambush whoever is coming. He's separated from the group, a friend is in danger, and there are swarms of unholy insects killing everything. So he calmly sneaks into the bad guy's complex, and saves his friend in time.
Unwitting Pawn: Like Asami, Mamon, Umezaki, and Hinoki's father, it's revealed that he was part of the scientific team involved in Yakusugi's ill-fated Dive Inspection - the one that released Kankel into the world. His involvement caused him to become a carrier of the Algernon virus.
A mysterious girl met by Keita in India, always smiling. She is accompanied by "Puleto", a lizard-like creature. She communicates only through telepathy using the Limpid Channel. Capable of great strength and speed, she saves Keita on several occasions. It turns out Chandi is a creation of Dr. Umezaki. She is the last of the D-Type Hunters, a series of superhuman clones.
Mystifying Buddhist priest who provides unexpected aid to the heroes. Even at in his old age (possibly 120 years old), he has managed to reach the peak of human abilities. He is amazingly fast, strong, and has powerful spiritual capabilities.
Chekhov's Gunman: His remarkable capabilities made him a suitable candidate for the Dive Inspection, a project to create the perfect human. It backfired horribly - as a result he became tainted with Kankel, and thus he turns out to be the one Betterman must ultimately defeat.
Mysterious species that appears during the course of the series. Throughout history, there have been sightings of the so-called "Betterman". They are capable of transforming from one form into another by consuming the seeds of the Animus Flower. Along with the ability to metamorphosis, they have access to the Limpid Channel.
Our Vampires Are Different: Potentially immortal, capable of transformation, flight, and with incredibly strong forms , and they technically feed on people. This aspect is even lampshaded in the show, when a student talks about Vampires being able to take the form of a fog. Betterman Nebula's supersonic attacks create fog.
The titular Betterman of the series, saving the protagonists on several occasions. He is capable of eating the seeds of the Animus flower to transform into much more powerful fighting forms. Mysterious and vigilant, Lamia's default form is that of a humanoid male, with long hair. He also bears more than a passing resemblance to Hinoki's brother, Mario.
Cool Shades: When in humanoid form. He also must have a secret stash of them, as he keeps tossing his shades every transformation.
Hair Color Spoiler: He shares the same tri-colored shock as Hinoki. Is it her brother? No - Lamia only looks that way because he ate the Animus seed that sprouted from Mario. In the process, Lamia gained his memories, as well as some of his phsyical attributes.
EMP: Nebula can create this effect using sound and light waves, destroying any unshielded electronics.
Make Me Wanna Shout: Nebula's main attack "Psycho Voice", which is capable of targeting only specific enemies without damaging anything nearby.
Horn Attack: "Psycho Glory" ends with Forte extending a bone saber into his foe's weak spot.
Often accompanying Lamia, Seeme is a strange yellow bird-like creature. She serves as his confidant, while helping him keep on eye on Hinoki. It's implied that, just as Lamia had eaten the seed of the Animus flower that sprouted from Mario, Seeme took the seed from the flower of Hinoki's mom.
The head of BPL, a major research facility trying to find future food resources. However, it turns out he was conducting unethical experiments, and creating an army of biological horrors. He dies in the confrontation with the Protagonists and Bettermen. Sadly, Umezaki was himself a victim of Algernon.
Voiced by: Osamu Ichikawa (JP), Steve Olson (EN)
Abusive Parents: The guy considers the D-Type Hunters his children, but puts them through live fire exercises to make them stronger.
Beauty Mark: He has a massive mole on the side of his chin.
Big Creepy-Crawlies: His "Carrier Ants". While not as huge as a other examples (they're about the size of a table), but they're still larger than they should be. And his swarms could combine into something appearing like these.
Mad Scientist Laboratory: The Biotechnology Provision Laboratory, a massive research facility (several huge domes, an airport, even an artificial lake). Since BPL has such vast resources and technology, Asami goes there to help in her investigations. She discovers more than she bargained for.
The Swarm: Several of them - worms, wasps, beetles, large ants, and even mind controlling parasites!
The Worm That Walks: Professor Umezaki has his insect swarms form into three large monsters. As if their size wasn't enough, these monsters can break up into individual swarms and reform when need be.
Telepathy: Gains access to the Limpid Channel, likely through some sort of biotech.
Unwitting Pawn: Like Asami, Mamon, the Officer, and Hinoki's father, it's revealed that he was part of the scientific team involved in Yakusugi's ill-fated Dive Inspection - the one that released Kankel into the world. His involvement caused him to become a carrier of the Algernon virus.
Leader of the Superhuman Federation, a group of powerful psychics. Mamon himself has powerful Dowsing abilities. Using those powers, he hopes to bring about a perfect human. Lamia defeats him during the climatic battle.
Body Horror: Mamon himself. After losing the first Brahman summon to Pachira, Mamon‘s second attempt at summons fails when Kaede‘s unborn child instinctively protects the mother by disrupting the ritual. Even though the summons failed, Mamon (using himself as the conduit), gains the ability to turn himself into a Brahman creature. His appearance looks like an advance origami design, but the skin of the creature turns out to be similar to that of the urinary bladder.
Elaborate Underground Base: The Superhuman Headquarters. While there is an above ground structure, the most of it is the "geofront" is subterranean. And it’s elaborate - with a spiral rail instead of an elevator to transport people, a brain scanner to only allow psychics to enter, and a number of traps along the way.
Eyes Always Shut: Subverted, they DO open during some of his particularly creepy moments.
Unwitting Pawn: Like Asami, Umezaki, the Officer, and Hinoki's father, it's revealed that he was a carrier of the Algernon virus, due to being part of the scientific team involved in Yakusugi's ill-fated Dive Inspection - the one that released Kankel into the world.