Watch out for spoilers!
A team of cyborgs employed by the military and science company MBORF. The main characters of the series.
- Color-Coded Characters: Omega is red, Xero is blue, Kary is green and Askad is yellow.
- Comm Links: They all appear to have one built into their bodies, allowing them to communicate with each other at any given time.
- Cyanide Pill: The Loner/Longinus knives, which each of the Cyborgs are designed to stab themselves with if they're ever damaged beyond repair, engulfing them and the surrounding area in an explosion.
- Cyborg: All of the members have some mechanical modification, except for Kary, who is a complete robot.
- Dwindling Party: Askad gets killed in the very first episode. Then Kary-08 betrays the team and gets killed off by Omega and Xero. Once that's taken care of, Xero is forced to Mercy Kill Omega when the latter is overtaken by XV. And after that's over with, Xero himself is hunted down and killed as an old man by the forces of the unseen Chessmaster behind the series.
- Powered Armor: Omega and Xero are both equipped with electrically operated armor.
The Leader of Bolverk Squad who mainly uses guns.
- The Comically Serious: Omega has a very professional attitude and doesn't make time for jokes.
- Cool Gun: His entire arsenal, pretty much. Of special note are the Ballistica, twin handguns that fire three bullets at a time and the Grudge, a sniper rifle that fires bullets capable of ricocheting off of thin air.
- Cool Helmet: Omega wears a helmet based off a Templar Knight's helmet in the first three episodes.
- Dying as Yourself: After being corrupted by XV, Omega manages to fight off XV's influence long enough for Xero to kill him.
- Enemy Within: Was secretly having an internal struggle with XV from episode 3 onwards. He manages to stall it off long enough to allow Xero to Mercy Kill him.
- Gatling Good: Attempts to defeat XV by pumping him with as many bullets as he can.
- Guns Akimbo: Wields both of the Ballisticas at the same time.
- Heroic Sacrifice: Omega ends up letting Xero kill him before XV can fully take over his body.
- I Cannot Self-Terminate: Has Xero kill him as opposed to killing himself.
A former ninja who now works for MBORF and serves in Bolverk Squad. He wields swords and other bladed weapons
- Be Careful What You Wish For: Vows at the start of episode 4 that he's going to be the one to cut Omega's head off. Despite becoming Fire-Forged Friends with Omega, he still winds up having to kill him after he gets overtaken by XV.
- Blood Knight: Kills enemy Mooks, even as they're running away from him.
- Blood-Splattered Warrior: By the end of episode three, Xero's cervical armor is splattered with blood.
- Cool Sword: His arsenal primarily consists of these. Of particular note is the Red Fang which, according to its description is a sword that generates a blade using the user's blood.
- Doesn't Like Guns: While he's unmatched in terms of melee combat, Xero is unable to use firearms.
- Fire-Forged Friends: Starts off disliking Omega though after being betrayed by their employer and locked up, escaping and fighting through an entire army of soldiers, as well as their own robot doubles, he and Omega bond.
- Jerk with a Heart of Gold: Xero is prone to profanity, insults, rude gestures and fighting recklessly, but he does have a heart. He's good friends with Omega and won't kill someone if they're unarmed.
- The Lancer: More hot-blooded with Omega and actively feuds with him.
- Like Brother and Sister: He apparently had this with Kary as a result of him carrying her when she was unconscious and arguing over his injuries. He was also disgusted by her betrayal.
- Mean Brit: The only British member of the team and by far the biggest asshole.
An android created by Askad who uses energy attacks. Using her gloves, she can siphon energy from her victims and use that to power her core.
- Action Girl: The most powerful member of the team, thanks to her energy abilities.
- Better to Die than Be Killed: She chooses to kill herself with the Longinus Knife rather than suffer a humiliating defeat at the hands of XV.
- The Big Guy: By far the strongest member of the team.
- Clipped-Wing Angel: Invoked by Askad, who suspected Kary-08 was working against the team and set up a final "upgrade" for her that actually restricted her powers.
- Cool Mask: The Executioner's Mask, which increase her strength at the cost of a good sum of her energy supply.
- The Dragon: She's the Overseer's last line of defense against Omega and Xero, and a key part in his plans.
- Dragon with an Agenda: Askad ponders whether she truthfully obeys the Overseer's orders or does only what she sees fit. Ultimately, when she realizes that the Overseer's goals don't align with hers, she does away with him.
- Evil Costume Switch: Dons a darker and more revealing outfit after her treachery is revealed.
- Goggles Do Nothing: She wears goggles on her forehead, but never puts them on.
- Imagination-Based Superpower: Kary can use the energy she gains from killing people in almost anyway she wants.
- Non-Standard Character Design: Lacks the facial cross most Madness Combat characters have, has a sharper and less rounded face, as well as eyes and a mouth. Though this may be due to the fact that she is an android.
- Omnicidal Maniac: After going crazy, she decides to kill everybody so she can use their energy to live forever.
- The Starscream: Kary does away with the Overseer after she realizes he doesn't intend to hold up his end of their agreement.
- Superpower Lottery: She can do almost anything with the energy she collects, including things such as raising an undead army.
- Token Minority: The only female of the team, as well as the only non-cyborg to have a Non-Standard Character Design. And the only one to be a Turncoat.
- With Great Power Comes Great Insanity: Needs Askad to perform regular check-ups on her to keep her from going insane because of how powerful she is. Meaning that, once Askad is killed, she winds up going off the deep end.
A tech-savvy member of the group who uses explosive weapons.
- Back from the Dead: He comes back as a robot in Episode 4 to aid Omega and Xero in their fight against Kary.
- Brain Uploading: His robot clone seems to have been programmed with his consciousness.
- Fatherly Scientist: Regards Kary as his daughter, likely due to her being based of his actual, deceased one.
- Gadgeteer Genius: He's responsible for most of the teams' tech.
- Heroic Sacrifice: Twice! First he sacrifices himself to take out a group of lifeforms infected with the XV Virus. Then, he comes back as a robot and sacrifices himself to give Omega and Xero a chance to defeat Kary.
- Number Two: Apparently Omega's second-in-command according to the bios.
- Posthumous Narration: He narrates the bios in episode 3.
- Sacrificial Lion: Gets killed off in episode 1.
- The Smart Guy: Skilled with computers and armed with explosives.
- Weak, but Skilled: The least strongest member of the group, but skilled with explosives and technology.
A mysterious company that specializes in military and science. They serve as the creators and employers of Bolverk Squad.
- All There in the Manual: The organization is only named in the character bios for Xionic Madness 3.
- Nebulous Evil Organization: Not much is revealed about them, and it's never really explained what they do.
- N.G.O. Superpower: They have access to highly advanced technology and enough resources to maintain a small army.
The mysterious leader of MBORF and the one Bolverk Squad answers to.
- Bad Boss: Imprisons Omega and Xero just so he can replace them with robotic duplicates. He later has no problem sending his own soldiers out to die just so he can collect data for said robotic clones.
- Big Bad: Responsible for many of problems in the series, though he doesn't take center stage until Xionic Madness 3. He's also indirectly responsible for Kary going insane.
- Diabolical Mastermind: Head of Nebulous Evil Organization? Check. Manipulative Bastard? Check. Cool Scar? Check.
- Good Scars, Evil Scars: Has a scar running down the left side of his face.
- Hoist by His Own Petard: Had the Overseer not sent Askad on a mission to be killed, then Kary probably wouldn't have gone insane and rebelled against him.
- Non-Action Big Bad: He's never seen doing anything physical himself, and in fact never confronts Omega and Xero face to face in the series.
- Treacherous Questgiver: Sends the squad on a Suicide Mission to BIO INT in the hopes that they'll be killed so he can replace them with the O. and X. Projects.
- Uriah Gambit: Has Bolverk Squad go on a Suicide Mission to BIO INT so he can replace them with mindless robots.
- Walking Spoiler: It's hard to talk about without spoiling the fact that he's the Big Bad.
- Xanatos Gambit: Sends Bolverk Squad on a suicide mission to BIO INT, intending for all of them (except Kary) to be killed so he can replace them with mindless robots. Should they all survive, he would have Kary attack and capture the survivors.
- Xanatos Speed Chess: After Omega and Xero escape, he sends out his forces to fight Omega and Xero to collect data for their robot replacements. After his soldiers fail to defeat the two, he downloads the data collected from the battle into Omega and Xero's robot counterparts and have them take the two cyborgs out.
- You Have Out Lived Your Usefulness: Imprisons Omega and Xero right after they complete their mission. It's implied he would have disposed of Kary-08 too had she not killed him first.
O. Project and X. Project
Two autonomous duplicates of Omega and Xero created by the Overseer to replace them in Bolverk Squad.
- Guns Akimbo: Like Omega, the O. Project dual wields the Ballisticas.
- Implacable Man: They shrug off any attack Omega and Xero through at them, forcing the two cyborgs to use their Longinus Knives to defeat them.
- Mirror Match: Both of them are able to match any attack Omega and Xero throw at them.
- Psycho Rangers: They're Omega and Xero's robotic counterparts.
- Swords Akimbo: X. Project dual wields the Boomknives, as does Xero.
A squad of Rank 4 Soldiers Omega previously served in before being converted into a cyborg and made the leader of Bolverk Squad. Omicron Squad is comprised of Specter, Wraith, Daemon and Shade.
- The Atoner: They regret continuing to serve the Overseer after he betrayed Omega, and later make up for it by helping him and Xero in their fight against Kary.
- Badass Boast: Specter is prone to delivering these.
Xero: She's fucking kicking our asses! That's the situation.
Specter: We'll have to kick hers harder then.
- Badass Normal: Despite being essentially just a squad of Elite Mooks, they are more than capable of keeping up with Omega and Xero, two Cyborgs with Powered Armor.
- Heroic Sacrifice: They all sacrifice themselves to destroy the building Omega was holding up.
- The Leader: Specter appeared to have been made leader after Omega was transferred to Bolverk Squad.
- MookFace Turn: They all go to assist Omega in his battle with Kary-08 to atone for betraying him.
- The Voiceless: Shade never talks in the series, and his profile mentions he is mute.
MBORF employs a variety of Mooks to carry out missions.
- All There in the Manual: The names of the different soldiers are given away in the character bios for Xionic Madness 3.
- Cannon Fodder: Rank 1 Soldiers are the lowest ranked and specialize in dealing in with minor conflicts like civilian control. This doesn't stop them from being sent out to fight Omega and Xero when they break out.
- Elite Mooks: Rank 3 Soldiers have more equipment and training than Rank 1 and Rank 2 Soldiers. Then there's Rank 4 Soldiers, who have even more skills and weapons than Rank 3s.
- Luckily, My Shield Will Protect Me: Spartan Soldiers are sword-wielding mooks equipped with invulnerable shields.
- Mecha-Mooks: The Leviathans, Fenixes and K.I.R.B.Y.s are all robots that specialize in combat.
- Shout-Out: One of the Mecha-Mook types is a rotund robot named K.I.R.B.Y.
Another mysterious company and the apparent rival of MBORF.
- Big-Bad Ensemble: Along with XV they are the primary threat Bolverk Squad in the first few episodes. They later wind up having to share the spot with the Red & Green Spy Teams as well when they are sent in.
- Cannon Fodder: BIO INT security guards, whose only defense against Bolverk Squad are clubs.
- The Ghost: Their chief, Charles Smith, is mentioned only once on a computer screen, when Xero accesses his files.
- Mooks: They utilize Security Guards and later Black Ops Commandos to fight our protagonists.
- Nebulous Evil Organization: Not much is known about them, other than the fact that they're studying XV and that they're an enemy of MBORF.
A mysterious alien life form discovered by BIO INT. XV can copy others weapons and abilities, as well as infect other lifeforms with a virus.
- Big-Bad Ensemble: XV and its spawn are as much a threat to our protagonists in the first 3 episodes as BIO INT and defeating it is one of their two objectives (the other one being blowing up BIO INT's headquarters).
- Chekhov's Gun: Its virus infects Omega later in the series.
- Eldritch Abomination: It's an extra-terrestrial life form that's virtually invincible and capable of copying others' abilities.
- Evil Twin: After copying enough of Omega's DNA, it gradually starts to turn into a clone of him.
- Logical Weakness: Copying Omega's DNA also makes it vulnerable to Omega's Suicide Pill, the Loner knife.
- Power Copying: Capable of copying the abilities of anyone it comes into contact with. This includes technology, as shown when it copies several weapons in Omega's arsenal.
- Villainous Rescue: Winds up unintentionally saving Xero after it takes control of Omega and defeats Kareleinne-08. Of course, once it's done with that, it goes after Xero.
An apprentice taken by Xero at some point after his and Omega's battle with Kary-08.
- Last Episode, New Character: Introduced in the final few minutes before the end of episode 4 part 3.
- Non-Standard Character Design: Like Kary-08, she has having eyes and a mouth and a sharper, less-rounded face as opposed to the standard Madness Combat character design.
- Sole Survivor: She's the last surviving named character by the end of Xionic Madness 4.