The heroine of the game, Boki is a Kitera Entanma with the ability to copy other supernatural powers and use them herself. While this is a very powerful ability, Boki laments it and wishes she had something more unique and flashy. Her uncle gave the Flux training program not only to train her, but to convince her of just how powerful she truly is.
- Action Girl: Emphasis on the action. Even if it's just in simulated space, Savant points out that anything she can do inside the Flux executable is possible for her to do in reality.
- Ascended Fangirl: After Boki's victory over Isotope, Savant reveals that the entire fight was recorded, and would make a good resume for her to submit to join a superhero team she's a fan of.
- All Your Powers Combined: Not only can Boki copy several powers at once, she can combine them into hybrid abilities.
- Aside Glance: Gives a dumbfounded stare at the screen after she defeats Zerynex Omega as Savant thanks her and flies away.
- Badass Boast:
- Boki: (after dying 5 times to Aekros) Go ahead, keep using your overpowered weapons and invincibility shield, it'll just make me stronger!Boki: (after quitting the stage when dying several times to Supreme Thremnat), This is really hard, and I need to take a break. But I will be back, and next time, I'll win! I swear it!
- Be Careful What You Wish For: A few times over the course of the story, Boki wishes she had a proper rival to fight. By the end of Hard Mode, she's made an enemy of a rookie Cyber who vows to find her in the real world.
- Cat Girl: A Kitera, a race of anthropomorphic, cave-dwelling cats.
- Character Development: She starts out being pretty insecure about her copy ability and doesn't see herself as particularly strong or capable. By the time the Normal campaign has finished, it's clear she's starting to see just how unique and important her ability actually is, and by the latter half of Hard Mode, she's actively boasting about her potential and ready to face whatever comes her way. By the end of Hard Mode, instead of complaining about the simulation being a waste of time as she'd originally thought, she thanks Savant for showing her what she's capable of and is ready to become the hero she's always wanted to be.
- Cool Sword: Boki absolutely adores swords, as evidenced by her Blade combos, and her battle against Blade Arikan. After she logs out of Flux, the first thing she does is to gush to Savant about how huge the Normal campaign's Final Boss is and how she got to wield the Supreme Saber, a sword five times her size.
- Cute Kitten: Not as cutesy or sugary as most examples, but in spite of her tomboyish nature and love of fighting, she's still a dorky young feline girl that peppers her dialogue with cat noises and if you leave her to stand for a few seconds, she'll give the player an adorable meow.
- Did You Just Punch Out Cthulhu?: She beat two simulations of the powerful Cyber weapons, the second of which is from an ancient civilization of lost magic. More significantly, she beat a Cyber one-on-one, albeit a low ranking one.
- Double Jump: One of Boki's native abilities, that she doesn't have to copy. True to her character, she thinks being able to fly would be a lot more convenient.
- Eat Dirt, Cheap: Kitera eat ore and gemstones, though they can eat normal food as well. Boki's favorite is emeralds.
- Emergency Weapon: The "Boki Beam", a small burst of raw magic energy. Apparently it's something that all entanma can do, and Boki gave it its name when she was little and didn't realize it wasn't a unique skill.
- Gamer Chick: The SNES in her room along with several Genre Savvy comments about gaming conventions in the simulation strongly suggest she's a pretty big fan of video games.
- Genki Girl: She's very energetic, especially when it comes to Rule of Cool things like robots and lasers.
- Happily Adopted: Boki shows no sign of angst about her adoption, despite admitting that she has no idea who her birth parents are, nor why they apparently abandoned her. By all appearances, she had a very good childhood.
- Heart Is an Awesome Power: Boki's opinion of her abilities notwithstanding, the things she's able to do with her power copying are really quite impressive. By the end of the game, one is left wondering if there is anything she can't copy. Her copied powers are just as strong as the originals, and she instinctively knows how to use them nearly to the same level as their original wielders. Perhaps best displayed by her ability to pilot enemy mechs: this should be impossible, but Boki copies the Magitek AI cores in order to control the mech like her own body. She doesn't even realize just how amazing this is.
- Heroes Prefer Swords: All of her weapon combos involving both Quick and Lightning create a Blade for her to wield. In addition, she wields Astral in its sword form.
- I Just Want to Be Special: Played with. Boki has this disposition despite already being quite special. For one thing, she's an entanma, born with supernatural powers, and even among entanma, her power copying is a unique ability.
- Interspecies Adoption: Raised by a Ploctite woman since her own parents seemingly abandoned her for unknown reasons.
- Kick Chick: She's a high-level Kwondai practitioner, but since the game focuses on her power-copying, we don't see too much of her martial arts skills. What we do see is her being very adept at kicking things. And since her feet are coated in crystalline growths (natural for her species), it makes sense they would hit pretty hard.
- Leitmotif: Mostly associated with variants of "Tangerine"; it plays over her World 1 as well as World 12. It also acts as a Theme Music Power-Up partway through the Supreme Thremnat fight.
- Power Copying: Her primary power. She can copy and use the powers of anything within a 30-meter radius of herself. (This wouldn't work so well for gameplay, though, so most of the time copied abilities are fueled by items dropped by defeated enemies.)
- Simple, yet Awesome: Playing as Boki is pretty simple, as she simply combines every power that she can and points her fingers to blow stuff up.
- Stout Strength: While Kiteras are among the smallest species in Zoincailla, they can also smash apart rocks with their gem-plated limbs.
- Technician vs. Performer: The Performer of the duo. Boki's powers come from her innate Power Copying ability, allowing her to copy enemy abilities and even mix them together on the fly without having to fully understand how they work. Her Power Copying even allows her to hijack certain Humongous Mecha Constructs and pilot them.
- Tomboy with a Girly Streak: Her love of fighting, boisterous attitude, and general Hot-Blooded nature provide the tomboy, while her room provides hints to a few girlier interests like her Love Bunny plush and the frills on her outfit.
- Unskilled, but Strong: Boki's main approach to gameplay is "acquire powers, point them at enemy, blow everything up!" Much of the game's obstacles can simply be powered through with the right combination of abilities.
- Verbal Tic: She meows every other sentence. She claims this is a habitual thing that Kitera do as a form of echolocation in the dark caves they naturally call home. She also says that Kiteras are supposed to learn to control the meowing as they grow, but since she wasn't raised around her own kind, she never did, and her tic would be seen as childish and immature among them.
- Viewer Gender Confusion: Boki's outfit and general demeanor don't give strong indications one way or the other regarding her gender, and her room doesn't provide too many clues either. Official artwork makes it a little more obvious that she's female, as her shirt has some slight frills to it.
- On the other hand, her species has an interesting form of Bizarre Sexual Dimorphism in that the male Kitera are quadrupeds with their crystals on their arms, while the females are bipeds with their crystals on their feet.
- Weak, but Skilled: Despite the above, among Entanma, she's not exactly a complete pushover, but her current strength is at level 3, compared to level 4 Entanma like Savant or those higher still, she's got a long way to go. That being said, she's only just learning to use her powers effectively, and her copy abilities give her incredible potential to rise higher among entanma ranks.
- What Kind of Lame Power Is Heart, Anyway?: Her opinion of her abilities. She wishes that she had a unique ability to call her own, not just borrowing other people's powers when they're nearby. Savant points out that power copying is in and of itself quite a unique and powerful ability.
- Wrong Genre Savvy:
- Thinks that by defeating the honorable Arikan, he'll pull a HeelFace Turn. Unfortunately, when he reappears as a boss in Boki's Hard Mode campaign, Savant reminds Boki that Constructs aren't able to be converted like that.
- She also treats Isotope as a Worthy Opponent and offers her a handshake after their duel, only to get kicked in the face as Isotope declares Boki her enemy. Once again, Savant reminds Boki that the brainwashed Cybers aren't so easily swayed.
Boki's adoptive uncle, a Ploctite entanma who is one of the leaders of the fight against the Cybers. Savant wants to help Boki learn how to better control and appreciate her powers, so he develops a custom virtual reality simulation program called Flux to help her along.
- Arch-Enemy: One Cyber in particular is said to be his nemesis, one with hacking and intelligence skills on par with his own, and also the one who designed and builds the Hypercube Krijyls, one of the most powerful constructs in existence. Out-of-game information states that this Cyber is named Paradigm, the Cyber of Conspiracy, who is known as one of the brains behind the Cybers.
- Badass in a Nice Suit: Savant's trademark is his three-piece suit, complete with magic Unmoving Plaid.
- Cool Uncle: Savant is Boki's uncle by adoption, and does many crazy experiments with magic.
- Crazy-Prepared: There seems to be nothing within the confines of the simulation he hasn't thought through first. The only exception is Exgal's powers, not because he didn't expect Boki to use them, but that he was confident she wasn't able to combine them into something unique. When he's proven wrong about this, he proceeds to test the hypothetical Aekros simulation with this in mind. Even when at the end of Hard Mode a Cyber hacks her way into the simulation, Savant made sure to obscure his niece's facial features. He made sure Boki's signal can't be traced with any certainty, even hiding any knowledge of what planet she's broadcasting from to the enemy.
- Difficult, but Awesome: Playing as Savant is very complicated, as each window has a unique control mechanic that you will need to learn to use it effectively. Master these mechanics, though, and Savant can pull off absurd techniques and use powerful weapons. As an example, let's look at Hyperlaser (Force > Plasma). This weapon requires you to position both yourself, your enemy, AND the Force window such that all three are collinear. If you can pull that off, however, you'll be able to output massive amounts of damage.
- Leitmotif: "Blackberry" and its variants, which play during World 1 for Savant instead of Boki's "Tangerine" (although Tangerine Takedown plays in World 12 for Savant as well).
- Let No Crisis Go to Waste: Isotope's intrusion into the Flux simulation ended up being beneficial for Boki in the long run, as not even Savant can accurately simulate a real Cyber and Boki can't actually die in Flux. Savant happily encourages Boki to kick Isotope's tail, knowing that this is an easy way to give Boki experience in fighting the real thing.
- Meaningful Name:
- A savant is a person with extraordinary intelligence in one particular area, at the cost of being mildly to severely handicapped in all others. Savant himself doesn't appear handicapped at all, but is extremely intelligent. The least that could be said about him is his single-minded work ethic and occasionally clueless interactions with Lymia.
- His given name, Senzae sounds phonetically similar to sensei, an apt description of his mentoring role to Boki.
- Nice Hat: He's never seen without his top hat. Even when he dies, his hat remains behind, undamaged, and can possibly take something out with it.
- Not So Above It All: His story is him bug-testing the game before giving it to Boki. Despite doing this for a serious purpose, he does admit that he's having fun blowing up everything too.
- Odd Friendship: He's good friends with fellow entanma Lymia, a fun-loving, upbeat Genki Girl who is as carefree and outgoing as Savant is serious and reserved.
- Only Known by Their Nickname: His given name, Senzae Irglyzh, is only mentioned occasionally by the Burst Krijyl if you die to her.
- O.O.C. Is Serious Business: Throughout the entire game, Savant always presents himself as calm and controlled, rarely showing any emotion other than vague bemusement. He only drops this facade whenever something goes horribly wrong, such as when Boki defeats Exgal using its own forbidden magic.
- Playful Hacker: An expert in computer hacking; he's able to reprogram certain constructs to serve him instead. And it's implied that he uses this skill for some more silly purposes than just the war against the Cybers.
- Power Copying: He can do it, but it takes him a very long time to analyze, break down, and program an ability in order to use it himself. He can copy everything in the game immediately because he wrote the game in the first place, and therefore already knows all the simulated abilities inside and out. In his fight with Lymia, in the final phase he can only use pink-colored versions of powers he's already used or a greatly reduced version of one of her lesser powers, since that's all he had time to analyze in the short time since the battle started.
- Reality Warper: His main ability, FOUNDATION, is essentially a reprogrammable magic computer. The spell can do anything he's able to program it to do. It's implied this ability is just as game-breakingly powerful as it sounds, but all he really uses it for in-game is simulating Boki's power copying.
- Screw This, I'm Outta Here!: In a rare moment of frustration, Savant temporarily quits the game after seeing one of Lymia's custom levels featuring dogs that shoot watermelons.
- Squishy Wizard: Savant is physically weaker than Boki in nearly every way, and even lacks a melee attack. He relies far more on his innate powers to keep him alive.
- Technician vs. Performer: The Technician of the duo. Savant's powers come from his Reality Warper hacking abilities, and he's extensively studied the abilities of numerous constructs to the point of being able to replicate their affects. While Boki pilots certain Humongous Mecha Constructs directly, Savant reprograms them to fight alongside him instead, and certain Solo powers (like Typhoon and Magna Crush) are replicated by summoning a copy of the Construct he took it from to perform the attack, while Boki performs the attack herself.
- Teleport Spam: Savant can teleport short distances multiple times in succession, but his teleport distance gets shorter and shorter if he doesn't allow it to recharge in between.
- This Is a Drill: He seems fond of drills when it comes to melee weapons: all of his Lightning weapons are drills of some kind, and he reconfigures Astral into a drill for his duel against Arikan.
- Weak, but Skilled: In comparison to Boki, he has less health and relies more on forethought and planning to be effective. Playing as Savant allows one to pull off some really neat tricks, but just rushing in and trying to blast everything isn't generally going to work. This also applies to his abilities as an entanma. Taking what's a relatively weak ability to project his will, he's built an entire coding script out of preset spells he's memorized, effectively hacking reality like a programming language.
- Willfully Weak: He is a great deal more powerful than what we see in-game, but he's limited his powers to be on roughly the same level as Boki's, so he can properly test how challenging the game will be for her. He claims that he could subvert, control, and defeat even the likes of the Giga Dengrahx in mere seconds at his full power.
A recurring boss that pops up in just about every world. Every time they appear, they scan the environment and gain powers related to it, so no two fights with them are the same.
- Adaptive Ability: When they appear, the Yoggval will scan the environment and take on powers suited to it: firey bombs in the forest, electricity in the Power Plant, wind while in the sky, etc. Trying this in the otherworldly Nexus causes it to glitch, but it still puts up a hell of a fight in its glitched state.
- All Your Powers Combined: Spectrum Yoggval combines the abilities of six previous Yoggvals, as well as possessing its own unique powerset.
- Boss Remix: Like the game's other minibosses, initiating a battle against a Yoggval transitions the stage music into a more intense remix.
- Came Back Strong: Phoenix Yoggval keeps doing this in its fight, as its name might imply. Defeating it while it's cursed seems to put it down for good, though it may also be due to the destruction of the artifact that transformed it.
- Final-Exam Boss: Spectrum Yoggval, who switches between several different hard mode-exclusive Yoggvall forms, each with their own life bar.
- Power at a Price: The Yoggval that becomes Phoenix Yoggval does so by becoming a will-less slave to the artifact that empowered it.
- Recurring Boss: You'll be fighting Yoggval around 16 times per character, including Hard Mode variants. Each and every fight is different.
- Slasher Smile: Every Yoggval sports a permanent, psychotic grin that never disappears, even upon destruction.
- Time Master: Sky Yoggval Ω will abuse Time Stands Still mechanics. Fortunately, Boki can use those same powers against it.
- Teleport Spam: Yoggvals reposition themselves with a quick teleport before using their next attack.
Arikan are a class of construct built by the Cybers to seek out and take down particularly dangerous opponents. While they come in several different varieties, they all wield a copy of the legendary magic weapon "Astral" and all abide by a strict code of honor. Two different Arikan are seen in the game: a male, sword-wielding one for Boki, and a female, drill-wielding one for Savant.
- Climax Boss: In the original version of the game, Arikan was the final boss. This isn't true anymore, but Arikan's battle is built up and foreshadowed quite heavily throughout the world they appear in, and is one of the more unique battles in the game.
- Hidden Depths: Drill Arikan, in Hard Mode, comes to realize that she's just a simulation, being used as training for warriors to fight against her real-world allies. Despite this, she resolves to persevere to the end, and deliver a battle worthy of a true warrior. Savant admits that, while he knew Arikan are among the more intelligent constructs, he never expected that level of self-awareness from one.
- Honor Before Reason: Arikan's greatest weakness is their desire for fair duels. They could be much more effective in combat if they used underhanded strategies or ganged up on an enemy, but they see such tactics as beneath them.
- Killed Off for Real: Savant promises to delete the now self-aware Drill Arikan after their final battle. His Hard Mode Boss Rush outright replaces her with an Aether Krijyl, indicating he kept his word.
- Leitmotif: One of the few bosses to have a unique theme song, "Starfruit Samurai".
- My Master, Right or Wrong: While intelligent, Arikan do not possess free will, and refuse to turn against the Cybers. This disappoints Boki, who expected some kind of HeelFace Turn-ed rival archetype.
- Single-Stroke Battle: The duel between Boki and Blade Arikan ends with this.
- This Is a Drill: Drill Arikan's preferred form of the Astral weapon.
- Worthy Opponent: Arikan respects those with great combat abilities, and always seeks to have fair, honorable duels with them. Defeating one at their full power results in them paying due respect toward a master fighter, and they hate underhanded tactics. Even Savant, with his hatred of the Cybers and their creations, finds himself thinking positively of Arikan.
Burst Krijyl/Hypercube Krijyl
Highly advanced Krijyls that act as commanders for planetary invasion forces. Hypercube Krijyls in particular are quite rare, which is good, because their destructive capabilities are among the highest of all constructs.
- Deadpan Snarker: Their "sassiness" rating is listed as 10/10. They are one of the few bosses who will make comments on the battle afterward, often boasting about how awesome they are or suggesting the player needs to learn how to dodge lasers better.
- Gravity Master: They can manipulate the intensity of gravity around them, lowering it for high mobility or strengthening it to tie down their targets. Boki copies this at the end of the battle and uses gravity control to throw Burst Krijyl around like a ragdoll in order to deal the final blow.
- Holding Back the Phlebotinum: Savant had to dial down the Hypercube Krijyl's capabilities for the simulation. As good as Boki is, she is not ready to take on one of these things at full power.
- Kill Sat: Their most powerful weapon is a giant laser beam fired from low orbit. Hypercube takes it up a notch by teleporting a single beam through portals to hit multiple locations (or the same location from multiple directions).
- Samus Is a Girl: The Bestiary identifies them as being female.
- Space Master: Hypercube gleefully warps space to her every whim.
- Teleporters and Transporters: Hypercube Krijyl has space-manipulation abilities. This ranges from Teleport Spam, to summoning enemies, teleporting her own lasers, creating a giant, nigh-invincible "hypercube" that chases the player around, to generating a "null-barrier" that partially phases her out of local space-time, making her nearly untouchable.
The leader of the Constructs who periodically berates the game's foes for failing to defeat the heroes. He appears to be the leader of all constructs in the simulation, and is not seen on-screen for most of the game.
- Background Boss: During the One-Winged Angel phase. You can't damage him directly, so you have to destroy his cannons to get him to drop his guard long enough for Boki to whale on his shield.
- Bad Boss: Regularly yells at his subordinates and takes failure horribly.
- Beehive Barrier: In addition to his unidirectional Thremnat shield.
- The Hard Mode version weaponizes this; late in the fight, he starts creating Beehive Barrier-styles projectiles to either launch at Boki or leave behind him as he charges.
- Big Bad: Serves as this for the storyline within the simulation. He's most obvious in Boki's Normal Mission Mode due to that being the only one where unexpected developments don't make him The Unfought.
- Bling of War: Appears to be made of gold and is covered in rainbow-colored lights.
- Elite Mook: The most powerful variant of the Thremnat enemy, by far.
- Final Boss: Of the full version of the game for Boki.
- Frickin' Laser Beams: He fires a powerful one from off-screen at one point. Does it again in his boss fight, firing a strong laser in a cutscene and weaker ones throughout the fight.
- Fusion Dance: Can perform hypersynthesis, just like Hixants. He uses this to combine with the remnants of the Fyskir to turn into a colossal hovering monstrosity.
- The Ghost: For the majority of the game, he's never seen on screen, with his first on-screen appearance at the end of the Factory barely qualifying as Emerging from the Shadows. He returns just in time for the Final Boss battle against him. Consequently, this means that he went completely unseen for 95% of the game's development time (since the final stage was the last part of the game to be completed before it left Early Access.)
- Hidden Depths: According to his database entry, he hates being subservient to his Cyber masters but is helpless to defy them. He takes his anger out on his own inferiors.
- It's Personal: Foregoing his orders to capture her, the Supreme Thremnat decides to straight-up kill Boki after she destroyed his troops and battleship.
- Last Villain Stand: He is fought after his Fyskir battleship has been decimated, seemingly along with the rest of the Construct troops aboard.
- No-Nonsense Nemesis: After having his entire operation completely obliterated by Boki, he decides it's no longer worth the trouble attempting to capture her, and instead devotes all of his energy to annihilating her. Taken Up to Eleven with his hard mode counterpart, a Supreme Thremnat customized specifically to counter Boki; he outright attacks her on sight and doesn't let up at all throughout his battle.
- Leitmotif: Dragonfruit, which first plays during their first appearance at the end of the Factory world.
- One-Winged Angel: After his Victory Fakeout, he absorbs and fuses with the remains of the Fyskir.
- The Hard Mode version also has one, but it acts differently. As opposed to fusing with disparate machinery upon having his health bar reduced to almost nothing, he supercharges his power on his own shortly before being reduced to half health, allowing him to fly and unleash a wider variety of attacks.
- Red Oni, Blue Oni: The Normal and Hard Mode versions, respectively. The golden regular version is very loud and angry, while the silver alternate version is quieter and more level-headed (his database entry implies that he's just as angry, but better at not letting it get the best of him).
- True Final Boss: In the sense that he brings the game's full version to a close after several "placeholder" final bosses for previous versions.
- The Unfought: The only time Supreme Thremnat is fought is during Boki's normal campaign, the rest of time, his Final Boss status is usurped either by Lymia or Isotope. Although this is subverted in one instance, as Boki's Hard Mode Boss Rush has her go up against the Supreme Thremnant she would have fought in Story Mode had Isotope not barged in.
- Victory Fakeout: He grabs Boki before she can land the final blow, throws her aside, and fuses with the remains of his ship.
- Worthy Opponent: While the original Supreme Thremnat absolutely despises Boki, the Hard Mode version considers her this.
The Delivery Person/Lymia
The person who delivered Flux to Boki at the start of the game. Revealed in Savant's story to be a fellow entanma, and quite a high-ranking one at that. She helps Savant with the bug-testing throughout his story. She is actually Lymia, a powerful hero who has fought the Cybers many times, and a prominent character in the lore.
- Bait-and-Switch Boss: It looks like Savant is going to test the Supreme Thremnat fight, but Lymia logs into Flux and hijacks the battle.
- Beware the Nice Ones: The most friendly and joyful character in the game, but according to a few bits of dialogue, she is a force to be reckoned with. And her database entry says that her power exceeds that of both Boki and Savant, not to mention her boss fight. She even manages to make the normally-weak Pokkaf a serious threat in one level.
- Fighting Your Friend: Savant's campaign always ends with Lymia hijacking the Final Boss fight (or the entire stage leading up to it) for a friendly duel against Savant.
- Final Boss: She destroys the Supreme Thremnat in Savant's campaign in order to take his place as the final boss.
- The Glomp: Does this to Savant in both of his endings.
- Lethal Joke Character: While she's just as silly as her dialogue indicates with an incredibly upbeat tune playing in the background, that doesn't at all detract from her considerable power as a boss.
- Leitmotif: Both variants of the "Strawberry" song play exclusively during Lymia's battles.
- Light 'em Up: Her final phase consists of this, with a predominant prism/rainbows theme.
- Mood Whiplash: The leadup to the final encounter with Supreme Thremnat is even more serious than Boki's. Savant readies himself for a fight, only for Lymia to log into Flux, decimate the Construct, and challenge him to a friendly match as happy music plays.
- One-Winged Angel: Played for laughs, as "Lymia EX" is just Lymia with a flame-print dress and sunglasses (and during her second phase she upgrades to a tie-dye dress and star-rimmed sunglasses.
- Pink Heroine: While not the hero of this specific story, she's pink nonetheless.
- Satellite Character: While she plays an important role in getting Flux to Boki, her main role is having someone for Savant to converse with during the latter's story mode, since Savant is testing out Flux mostly by himself.
- Shock and Awe: Stated to have electromagnetism-based powers. She claims she could destroy the entire Factory (which makes up a full world in the game) quite quickly and easily, and offered to teach Savant about electromagnetic powers in one level. Also used to great effect in her boss fight.
- Super Speed: It isn't made clear exactly where Savant's office is in comparison to Boki's home, but she comments that Boki lives "all the way out on Planet Aisnoda". She still makes the trip in seconds. According to the database, she can move faster than light.
- Totally Radical: The first half of the "Lymia EX" fight puts her in a fire-themed shirt and sunglasses.
Isotope is a rookie Cyber who, alongside an unnamed partner, spies on Boki in the Hard Mode version of World 12. She quickly loses her patience and enters Flux to throw down with Boki, giving the copycat her first battle against a Cyber.
- Artificial Stupidity: Her patterns are very simple but powerful, relying on her raw damage to make up for her obvious tells and straightforward attacks. An intentional example, both so the player has an easier time grasping the new mechanic and fitting with her blunt and aggressive personality.
- Call a Human a "Meatbag": Dismissively refers to Boki as a "flesh-cat" after Boki beats her. As a Cyber with a fully synthetic body, she naturally looks down on unconverted entanma.
- Evil Counterpart: In every way imaginable. Like Boki, she's a Kitera, has similar jumping and kick abilities, is impulsive and ready for a fight, takes orders from a calm, rational superior, and is at a rookie level with an ability that has vast potential. Unlike Boki, she's perfectly willing to kill living creatures, takes her enthusiasm for fighting to dangerous levels, doesn't listen to any of her partner's advice, and has no respect for her opponents.
- Evil Laugh: Frequently sports a harsh, distorted cackle when she hits Boki. As one of the few characters who have human vocal effects in the game, this just serves to make her stand out all the more.
- Fantastic Nuke: She uses her magic to induce unstable atomic reactions with reckless abandon, even going so far as throwing miniature suns around.
- "Get Back Here!" Boss: Since the fight takes place in the stage the second Fyskir core is located, she'll occasionally break out of the room and flee to a different part of the stage, until she's being fought at the same time as the core.
- Handshake Refusal: After Boki bests her in combat, she's offered a friendly handshake for a battle well fought. Isotope bluntly kicks her in the face for her trouble.
- Hoist By Her Own Petard: Firing an atom projectile into one of Isotope's own projectiles produces a larger and more powerful explosion than just shooting at your own projectiles, so the best tactic is to use Isotope's projectiles against her to get her caught in the explosion.
- Hot-Blooded: She doesn't have enough patience or self-control to keep herself from abandoning her espionage mission to battle Boki.
- I Love Nuclear Power: Isotope's powers all revolve around nuclear power. One of her attacks is to create a miniature star and throw it at her enemies. When Boki copies her powers for the battle, things get... explosive.
- Knight of Cerebus: By far the most serious encounter in the game: she's an actual Cyber as opposed to one of FLUX's simulated Constructs, and an Ax-Crazy atomic magic-bomber at that.
- Leitmotif: Nectarine Nightmare, a foreboding and unusual song that plays during her boss fight.
- Mirror Boss: The best example in the game; not only do she and Boki use the same attacks thanks to Boki's copy powers, but Isotope is also a Kitera like Boki, and uses similar kick moves too. Her health meter even copies Boki's exactly (including a rotating list of attacks,) except in the upper right corner.
- One Head Taller: Noticeably taller than Boki herself.
- One Of These Is Not Like The Others: Per the developer's comments in the sound test, Isotope's theme is unlike anything else in the game, foregoing the higher key melodies and upbeat tone for a darker, more sinister melody that's more obviously synthetic.
- Personality Powers: Isotope is careless and relentlessly destructive; she's unstable.
- Red and Black and Evil All Over: Her color scheme.
- Sore Loser: Boki can die as many times as needed to her, but the moment Isotope loses, she makes like an atom and splits. But not before kicking Boki in the face for trying to being a good sport.
- Used to Be a Sweet Kid: While we don't know a lot about what she was like before becoming a Cyber, her database entry says that she at least tried to learn how to restrain herself to prevent others from getting hurt by her powers.
- True Final Boss: Of Boki's Hard Mode campaign.
- Voice Grunting: Possesses a soundbite similar to Boki's in her text with a mechanical filter.
- We Will Meet Again: Promises to fight Boki seriously next time outside of the simulation.
This unseen figure works alongside Isotope in spying on Boki. They are more focused on their assigned mission than Isotope, leading to frustration when the latter decides to take a less subtle approach.
- Affably Evil: For someone that works toward brainwashing and enslaving Entanma, they're remarkably polite about it. They pay a measure of respect to Boki for defeating Isotope, and if you've lost to Isotope more than a few times, they'll offer Boki some advice on how to combat her.
- Deadpan Snarker: Surprisingly, for how brief their appearance is, they pack in a hefty dose of pithy sarcasm. "you botched our reconnaissance mission so you could get your butt kicked at a video game... are you happy now?
- Evil Counterpart: Plays the same role to Savant to Boki that he does for Isotope. They'll even give Boki some advice after dying a few times, just like Savant would.
- Foreign-Looking Font: The font they speak in is distinctly different than everyone else's; they don't speak in unreadable symbols like Exgal or Aekros, but instead speak in a weird font that looks like it's made of large pixels.
- The Ghost: We know nothing about them aside from the fact that they are part of the Cyber army; we don't even know if they're a Cyber or a Construct.
- We Can Rule Together: After Boki's victory, they offer to let Boki join the Cybers and increase her powers. Makes sense, as the one thing that is known about the Cybers is they are always seeking to convert more entanma into Cybers. Boki refuses, naturally, saying she'd prefer to keep her skin, thank you very much.
Introduced in the game's extra world, Exgal is a powerful superweapon recently discovered in the Cybers' possession. Using what data he has on it, Savant adds it to Flux in order to test a hypothetical means of destroying it. Fueled by unfathomable dark magic and nigh-invincible, the only chance Boki has against Exgal is to destroy it's accompanying Ulsev devices to absorb the light magic within (used to keep Exgal in check) to use against it. Or at least, that's what's supposed to happen. Boki's hard mode campaign reveals that Exgal is an attempt to copy an ancient, even more powerful superweapon named Aekros, whom Savant has similarly added to the simulation.
- Badass Boast: Exgal's text is actually decipherable, and deciphering its database entry reveals some...pretty nasty threats.
- Black Speech: Exgal's font is pretty harsh on the eyes, and it communicates via high-pitched screeching.
- Dem Bones: Exgal's entire arena (as well as certain levels in its Extra World) is covered in bones, and Exgal itself sports a massive, demonic-looking skull.
- Eldritch Abomination: Exgal definitely gives off this vibe. Even its mere presence in the enemy database causes some eerie things to happen.
- Healing Factor: While you can do damage to Exgal and Aekros by using one of the Ulsev weapons, they regenerate health far too quickly to actually be defeated with them, requiring a Combination Attack with all three Ulsev weapons to put them down (and even then Aekros requires further pummeling after the fact.)
- Lost Technology: Aekros is the product of an ancient, long-lost civilization, and though the Cybers have attempted to reverse engineer and duplicate it, the best they can come up so far is the still-formidable but clearly corrupted Exgal.
- Our Angels Are Different: Aekros' stage is basically the game's Bonus Level of Heaven, with angel-themed Constructs, and it's own design evokes certain elements of the more traditionally incomprehensible Abrahamic angels (such as rings with many eyes covering the inside.)
- The Unintelligible: Everything about Exgal, from its own lines, to its stage name, weapon descriptions, the name of the stage it's fought on, and even its database entry are written in incomprehensible Black Speech. Aekros is similar, but with a less intimidating and more alien font, though its encyclopedia entry is at least readable without having to translate the text.
- Wave Motion Gun: Boki's combination weapon after absorbing the power of Aekros' three Ulsevs is a massive laser. The finale of the boss battle ends with Boki and Aekros engaged in a Beam-O-War struggle.
- You Cannot Grasp the True Form: Exgal's Ulsevs are explained to be channelling a "forbidden spell" that is so dangerous that it needs to be split into three. The weapon descriptions for all three parts are rendered in the same incomprehensible text as everything else about Exgal, and when Boki absorbs the power of all three Ulsevs, she gains access to whatever this spell is (which she apparently wasn't supposed to be able to copy.) Using it does...something to Exgal before the simulation finally crashes under the strain (followed by Boki passing out.)