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Krang
- Adaptational Badass: In the 1987 cartoon, he was a Smug Snake who typically played Orcus on His Throne and relied on Shredder to carry out his plans, while continuously berating him for his failures and kept relying on him anyways. This Krang does not need any help from Shredder for his plans. He is also not a helpless creature outside his Powered Armor, either, having survived in a warzone without it, and once killing a subordinate, without using any weapons, who proposed that he was helpless outside his armor.
- Bad Boss: Not only does he have impossible expectations of his underlings, he will punish them severely if those expectations aren't met. Or if the underling does anything that could potentially be insubordination. Oh, and he considers even his successful underlings to be completely expendable and cares nothing if they live or die.
- Berserk Button: Never give him the impression that you think he's helpless without his power armor. Even if you're just being polite and offering to help him — don't. He will kill you for it, even if he says he won't.
- Bizarre Alien Biology: Seems in this continuity, Utroms are a parasitic race. Which is why after Leatherhead eats him, he regrows on—not in, ON—Leatherhead's chest.
- Break Them by Talking: He pulls this off during the "Trial of Krang" arc. When called to the stand, Krang insists that everything he did was to ensure the survival of his race, and he and King Zenter are similar since Zenter used the Triceratons to defend Neutrino from Maligna, the only difference being that Krang himself doesn't pretend to have the right to judge Zenter's actions; rather, he respects Zenter since he did what he had to do to save his people from death just as Krang did. This deeply affects Zenter, who ends up deciding that he has no right to pass judgement on Krang and opts to put him under house arrest by the surviving Utroms.
- Composite Character: This Krang has some aspects of Ch'rell from the 2003 cartoon, being an Utrom and a more serious villain. Funnily enough, Ch'rell actually exists in the IDW comics canon too, and was stated to have served under Krang at some point.
- Even Evil Has Loved Ones: He does horrible things, but they are all in the name of bringing his people back into prosperity after their homeworld became uninhabitable and the majority of them died.
- Even Evil Has Standards: He was appalled and disgusted with his father for knowingly and willingly putting their race into a Forever War.
- Hostile Terraforming: He plans to turn the Earth into a new Utrom throne world by changing its atmosphere to be compatible with his species. He has a degree of success when the Technodrome manages to make Burnow Island into a survivable habitat for Utroms.
- Karma Houdini: Zig-zagged at the finale of the "Trial of Krang" story arc. He isn't sentenced to prison or death for his crimes, but instead placed under house arrest by the revived Utroms, to be kept on Burnow Island for the rest of his days. Leatherhead, however, has other ideas...
- Killed Off for Real: Krang finally dies in issue 7 of The Armageddon Game from being shot at by the Neutrinos. Donatello then hacks into Metalhead to make sure Krang stays dead this time.
- Not Quite Dead: Thanks to some quirks of Utrom biology Krang manages to return from the dead in The Armageddon Game.
- Not-So-Well-Intentioned Extremist: Krang repeatedly insists that he's doing what he feels is necessary to ensure the survival of the Utroms, and swears up and down that he did what he had to do to do so. During the "Trial of Krang" arc, the Fugitoid tears his argument apart, stating that though Krang paints himself as a savior of his people, he's caused nothing but pain and suffering to millions of innocents, and killed numerous others in pursuit of his goal, stating that no savior would ever consider mass murder and genocide as a means to an end, summing Krang up as nothing more than an Omnicidal Maniac.Fugitoid: General Krang fashions himself a victim of circumstances beyond his control, forced to be a rescue of his people. That is only a half-truth. He did rescue his people by any means he deemed necessary. But what kind of savior finds the annihilation of millions of innocent souls as one of those acceptable means? The answer is none, because mass murder is a method only of a genocidal maniac.
- Took a Level in Badass: Not only compared to his 1987 incarnation, but in-universe as well — he started out as the Spoiled Brat son of the Utrom Emperor, a constant disappointment to his father and pretty much useless. After a spaceship crash stranded him in the wilderness on a hostile planet, he had to fight for his survival and not only grew far tougher and stronger, but developed a new, more independent and much more lethal outlook on things.
- "Well Done, Son" Guy: His initial goal, as detailed in the Krang one-issue micro-series, was to gain the approval and respect of his cold and dismissive father. Later on, he "outgrew" this goal when he decided that said father wasn't worthy of his respect.
- Well-Intentioned Extremist: He wants the Utrom Empire to survive and thrive, and he's willing to do anything, no matter how cruel or hideous, to ensure this.
Colonel Ch'rell
- Adaptational Job Change: In the 2003 TV series, he was an intergalactic terrorist and considered by the Utroms to be the most dangerous criminal in the known universe. Here, he's a legitimate colonel in the Utrom military.
- Adaptational Personality Change: In the 2003 TV series, he was a massive Boomerang Bigot who expressed a desire to eradicate the Utrom race, and his whole character motivation centered around wanting to escape Earth so that he could conquer and enslave his homeworld. That isn't the case here, where he is on the same side as the Utroms and is shown to be held in high regard by his fellow Utroms of military rank.
- Adaptational Relationship Change: In the 2003 series, he was the Turtles' Arch-Enemy and their most recurring nemesis to the point where he eventually became willing to destroy the entire multiverse so long as it meant killing every Turtle in existence. Here, while he does eventually wind up as an enemy of the Turtles, he's not their most personal nemesis nor does Ch'rell hold any special hatred for the Turtles.
- Colonel Badass: He's undeniably badass, wading directly into combat against the overwhelming EPF assault with only a Bishop-controlled Slash able to slow him down.
- Colonel Kilgore: Was considered extremely bloodthirsty even by the standards of the imperial Utrom military before going into stasis. Krang himself thought he was too fond of violence and on at least one occasion had to forcibly teleport Ch'rell out of a warzone the colonel refused to leave.
- Dies Differently in Adaptation: He's atomized by Bebop and Rocksteady turning the Technodrome's power back up in his original death but here, he's stabbed to death by the Triceraton Seri.
- The Dragon: Used to be Krang's number two, engaged in tactical combat operations on the ground while Krang set overall strategy.
- Godzilla Threshold: When the surviving Utroms are revived after Krang's defeat, they decide to leave Ch'rell in stasis because he's extremely unlikely to agree with the peace treaty signed by the denizens of Burnow Island. When Bishop's EPF launches a full-scale invasion the Utroms and Triceratons reluctantly reawaken him as they need his skills to fend off the humans. Unfortunately, he'd already been awakened in secret by an underling weeks earlier and had spent the time preparing for his takeover.
- Hypocrite: Refuses to allow the use of the Technodrome's machinery to make incubation equipment for new Utrom children and instead insists on using Triceratons to incubate them as is natural for their parasitic race, but thinks that a Triceraton getting pregnant and giving birth instead of being grown in a test tube is an existential threat.
- Killed Off for Real: In issue 138 during The Armageddon Game.
- The Starscream: Kitsune's mind magic reveals that he has always chafed under Krang's command (since Krang was more interested in winning strategic victories than war for its own sake like Ch'rell preferred) and by the time of Issue #136, the two of them finally came to blows, with Ch'rell being unwilling to follow Krang any longer.
- Tyrant Takes the Helm: After the battle against the EPF is won, there's an uneasy stalemate between him, Councilor Ma'riell (representing the Utrom civilians) and Commander Zom (representing the Triceratons). When Zom unexpectedly lays a viable egg, Ch'rell decides the risk of their slave race gaining true independence from Utrom technology can no longer be tolerated and launches a coup. Ma'riell and Zom are shot while saving Zom's daughter Seri, leaving him in sole control of Burnow Island and its resources...
Baxter Stockman
- Big Bad Wannabe: Baxter is the initial villain for the Turtles and he has resources and intelligence that could turn him into a major threat. However, most of his attempts to get into back into game after Krang take him to work on Technodrome end up in failure: his plot to hijack Technodrome nearly leads to Krang successfully terraforming the Earth, his alliance with Shredder falls apart after one night, and when he finally seems on his way of becoming a threat again as mayor of New York and creator of Mutant Town before joining Rat King’s Armageddon Game, he gets intimidated into backing out and becoming the spokesperson for mutants.
- The Chessmaster: Literally. His father forced Baxter to play chess with him constantly and derided him whenever he made a mistake. Consequently, Baxter now views everything that happens around him as a being like chess game with other people as either pieces to exploit or opponents to overcome. Baxter actually dives so deep into this mindset that it borders on Fatal Flaw as he can't exit this mindset long enough to recognize situations where his 'me vs everyone' inclinations aren't the best strategy unless someone actively spells it out for him.
- Chronic Backstabbing Disorder: At times it seems that Stockman literally cannot stop himself from betraying his own allies to further his personal goals. The codifying example is during the Attack on the Technodrome arc when he betrays the plan of the Turtles and Fugitoid to distract Krang to Krang even knowing that Krang's plan involves wiping out all native life on Earth including him all because he wanted to take sole control of the Technodrome himself. This allows Krang's plan to nearly succeed.
- Enemy Mine: Allies himself with the turtles and their allies to stop both Krang and the Triceraton invasion.
- Insufferable Genius: He loves to remind people of his vastly superior intellect.
- Karma Houdini: He still has to receive any actual punishment for his crimes, even getting hailed as a hero and becoming Mayor of New York. Even after joining Rat King, the worst that happens to him is being forced to go on a press tour with Sally Pride and Regenta Seri to spread mutant acceptance.
- Non-Action Guy: Like most other incarnations, Stockman is not a fighter and often relies on robots and cyborgs for protection.
- Powered Armor: His weapon of choice when he is forced into physical confrontation.
- The Sociopath: Stockman's first priority is always self-preservation. He cares nothing for the rest of the human race and has to be convinced that saving the world is in his best interests.
- Starter Villain Stays: He is the initial enemy of the Turtles and Splinter as one whose mutagen created them, joining with Old Hob to hunt them down and further experiment on them. While his status as a major threat is severely diminished after Krang and Shredder officially step in, he stays a recurring villain and even outlives both of them (Shredder gets resurrected, but he is no longer a villain).
- Token Evil Teammate: He became this when he allied himself with the Turtles and their friends for a time.
- Villain with Good Publicity: Stockman is lauded as a hero for his part in stopping the Triceraton invasion; even deciding to run for mayor of the city, a goal he also achieves.
Leatherhead
- Adaptational Villainy: Those more familiar with the more recent cartoons' depiction of Leatherhead as a tormented-yet-gentle soul will be taken aback by his greater violent streak, here.
- Appropriated Appellation: How he got his name. Apparently the locals gave him his name and he just went with it.
- Be Careful What You Wish For: He wanted to flee his prison and see the outside world. The first time he sets foot in New York, the sights and sounds give him sensory overload.
- Boomerang Bigot: He feels that mutants are all abominations that should never have existed, including himself. This causes him to attack Old Hob when the latter genuinely offers him a place in his crew.
- Composite Character: His design and manner of speech are most similar to the 4Kids incarnation, but has a hatred of Krang, who created him, much like in the 2012 series, with his origin and villainous alignment being taken from the 1987 cartoon.
- Death Seeker: Ever since Krang grew on his chest, he spends every second of his life trying to kill or starve himself so he can take Krang with him.
- Enemy Within: Even after killing Krang, he still has hallucinations of him, taunting him.
- Its gets worse: Thanks to how Utrom biology works in this universe, Krang has regrown on poor Leatherhead's chest.
- Faux Affably Evil: Pretty civil and courteous to the turtles, until it's revealed that he's only after the Utroms in the same facility.
- Good Thing You Can Heal: His mutation allow him to regenerate lost appendages, something he himself points out is not natural.
- Hunter of His Own Kind: He develops a disdain for mutants and resolves to protect natural creatures from them.
- Really 700 Years Old: Leatherhead was actually mutated sometime during the 18th century, when a pirate ship unloaded some of its cargo — which included canisters of mutagen — into the water where he was swimming. He's been around since then, and doesn't show any signs of slowing down from old age.
- The Dog Bites Back: He was experimented on and abused by his Utrom creator, Krang. He's now out for revenge. Eventually he eats Krang alive.
Old Hob
A mutated alley cat with a long-standing hatred of humans. In the beginning he is out to kill Splinter who scratched out his eye in the event that exposed them all to mutagen. Eventually, sick of being mistreated by humans, Hob decides to become a freedom fighter for mutants everywhere. Old Hob is morally dubious and habitually rude, but he keeps his promises and he is wholly dedicated to helping mutants.
- Anti-Hero: He started the series as a villain, but after time and Character Development set in he turned into a more heroic figure...though still a rather brutal and morally-ambiguous one. he stops being this and returns to being a villain after Slash's death and especially after using a mutagen bomb on hundreds of innocent human civilians.
- Anti-Villain: His plan revolving around Mutant Town proves to be this around issue #120 when he reveals that, beneath all his amoral decisions, he is perfectly fine with loss of personal power and authority if it means mutants as a whole gain.
- Badass Longcoat: Frequently wears a trench coat after his return in Issue #16.
- Cats Are Mean: Hob snarks and lashes out at just about anyone he interacts with, especially Splinter and the turtles. The Mutanimals are mostly exempt from this, but even then Hob's not exactly a peach to be around.
- Combat Pragmatist: Hob'll do just about anything to come out of a fight on top. From slashing an attacker in the face with his claws to bringing down an entire building on them.
- Crazy-Prepared: Old Hob seems to have a weapon or plan for every situation.
- Deadpan Snarker: Hob can't help himself which makes him very hard to work with.
- Dumb Muscle: He starts out as a simple thug before wising up and setting out to create an army.
- Everyone Has Standards: Even in spite of his hatred of humans, he's still horrified that Bishop would so callously kill his own father in cold blood.
- Evil Costume Switch: After Slash's death, Hob loses whatever morality he had, culminating in him detonating a chemical bomb at a political rally, forcibly mutating everyone there. He also switches to a pure white outfit, different from his black shirt and jeans he wore for most of the story.
- Expy: He share many aspects with Caesar from Teenage Mutant Ninja Turtles & Other Strangeness, including his design, his overwhelming hatred of humans and his relationship to mutant weasels.
- Fantastic Racism: Against humans. His hatred of them runs so deep that the very second he found out that Bebop and Rocksteady were formerly human, he instantly reconsiders his plan to convince them to join his mutant army and goes so far as to attack them. He's mellowed off on this over time, more concerned with keeping mutants safe, and is absolutely horrified and disgusted when Bishop murders his own father in cold blood. Unfortunately, he goes right back into this after Slash's death, and not even his saying that he does accept some humans as allies helps alleviate this. He later completely gets over his distaste of human mutants enough that he decided to drop a mutagen bomb on a political rally.
- Fatal Flaw: Wrath. Anger can be a great motivator but Old Hob takes it to very unhealthy degrees. In the Mutanimals miniseries, his (entirely justified) rage at what Null's been doing to mutants drives him into increasingly reckless behavior and nearly gets the team wiped out. Seeing Slash go berserk helps him to overcome this long enough to deal with Null, but it's always close to the surface, and when Slash dies...
- Gun Nut: Hob collects weapons of all shapes and sizes and has at least one on him at all times.
- Heel–Face Revolving Door: He never quite attains Face status but he goes from outright villain (his early appearances) through Unscrupulous Hero (in his time with the Mutanimals) and back to full villainy (with his mutagen bomb attack after Slash's death). In The Armageddon Game he's started to become more sympathetic again and is once again a teeth-clenched ally of Clan Splinter.
- Karma Houdini Warranty: Aside from losing the respect of his former allies, Hob suffered very little in the way of consequences in the year following him setting off the mutagen bomb. However, as Sally Pride grows in popularity and is elected mayor of Mutant Town, the majority of the town turns against Hob and imprison him and his crew for their crimes.
- Kill All Humans: Hob has very little patience for humans and will use lethal force against them whenever possible. His hatred for humans is so severe that it has been a source of friction within the Mutanimals. At most he will tolerate some humans, mainly Casey, April and Lindsey, but he doesn't hide his disdain for humans in general.
- It is so bad that when he attempts to recruit Bebop and Rocksteady to his cause, and they start to actually consider it, when he learns that they are actually half human mutants and not pure animals he instantly shoots Rocksteady in the face (not that this does much).
- He seems to ease off a bit from this overtime, especially when he takes Bishop's father and the wife of the head soldier hostage so he can exchange then to get the captured Mutanimals back. He proves himself a skilled negotiator who keeps his word, releases the hostages and before doing so, he even convinces the soldiers to break off all ties with Bishop after they all see how paranoid, fanatical and ruthless he comes across. Most notably, Hob becomes horrified and genuinely pissed off when Bishop proceeds to kill his defenseless father without a second thought.
- After Slash's death, his hatred for humans blows up again even worse than before, but rather than killing them, he decides to make them mutants as well, starting with a large crowd of people attending Stockman's mayor acceptance speech in issue 98.
- Left for Dead: When Baxter shoots him on an airstrip. He only survived due to the curative properties of mutagen and Splinter's blood.
- Morality Pet: Despite his nasty attitude, he comes to view the Mutanimals as a family and is very protective of them, especially Slash. The feeling is mutual for the rest of them towards Hob. Until the mutagen bomb happened, something he pulled off due to being unable to cope with Slash's death, which sent Hob spiraling down into full villainy.
- Never My Fault: He dropped an airborne mutagen bomb on Stockman's election speech, turning countless people in to mutants and effectively ruining their lives. Despite this, he doesn't view himself as having done anything wrong. In fact, he views himself as the only hope that the disenfranchised minority he created has.
- Took a Level in Badass: As mentioned above, Hob started out the series as nothing but a dumb, lowly thug with a one track mind. Overtime he became a very smart, shrewd individual and highly skilled in all sorts of firearms.
- Took a Level in Kindness: He never becomes a Nice Guy or anything, but he does soften up a little as the series goes on, becoming more of an Anti-Hero than an outright villain. He genuinely cares about the plight of mutants and he'll do what it takes to aid and protect the Mutanimals, and his hatred of humans becomes downplayed in favor of keeping mutants safe.
- Took a Level in Jerkass: Spirals into this after Slash's death. After dropping the mutagen bomb, he effectively becomes a villain again. However, Issue 110 reveals that he's starting to have doubts about the path he's taking and when Mushroom, Zink and Zanna show up he's sincerely happy to see them again, also telling them he's sorry after Zink calls him out on tossing a net over them, displaying remorse at trying to pawn them off to the Foot Clan.
- Tragic Keepsake: Slash's black face mask, which he gives to Hob before his Heroic Sacrifice.
- Well-Intentioned Extremist: While Hob starts out as a self-centered Jerkass who develops a serious hate-on for humans, he eventually grows more of a conscience and an awareness for the plight of mutantkind. After the mutagen bomb and the quarantine, he still genuinely wishes to make mutants' lives better, but after Slash's death he lost whatever morals he had, and began using more extreme methods for what ha considered the "greater good." Not only in using mutagen bombs to mutate innocent animals, but also in making business with the Foot by giving them mutated children to train as soldiers in exchange for supplies for Mutant Town (as the supplies they get from the government are insufficient). His borderline deluded insistence that only he can help the residents of Mutant Town, by any means necessary at that, makes this even more egregious. However, issue 120 does reveal that he is still sincere in his goal of mutant equality and would be willing to step down if they decide Sally would be the one to lead them to it as well as coming to blows with Man Ray when the later starts going behind his back and tries to have her assassinated..
- Would Harm a Child: Starts kidnapping children from the mutant ghettos to train to be his soldiers and to sell to the Foot Clan for supplies, starting with Mushroom, Zink and Zanna. He eventually displays remorse over this in issue 110 and resolves not to do so anymore afterwards, though he is forced to give Tokka and Rahzar to Karai when she threatens to attack Mutant Town.
- You Can't Make an Omelette...: Tells Sally this in regards to him selling mutant children to the Foot Clan in order to get enough supplies to make Mutant Town self sufficient. She decks him the moment he says it.
- Your Terrorists Are Our Freedom Fighters: Despite being the one to set off the mutagen bomb and his subsequent criminal dealings afterwards, Hob actually manages to have a number of loyal supporters in Mutant Town, mostly from people whose lives were awful before their mutation and see their current situation as an improvement as well as from people who simply have no issue with being transformed into an animal person.
Madame Null
- Adaptation Dye-Job: In the the Archie comics, Null had white skin. In the IDW comics, Null's skin is red.
- Adaptational Nice Girl: To a minor extent. While not any less evil, Madame Null is far less sadistic and needlessly cruel than her original counterpart, opting for Pragmatic Villainy instead.
- Big Red Devil: Well... she's actually quite petite, but otherwise fits the description. She's also not actually a demon, and is instead a creature from Dimension Z along with her cousin Noi Tai Dar.
- Corrupt Corporate Executive: Much like her original counterpart, she heads a large business and will do anything for profit. Her main objective in present is creating mutant slave labor on multiversal scale.
- Faux Affably Evil: She's quite polite, civil and even reasonable — but she's not nice. She has absolutely no scruples or conscience, she won't hesitate to kill or maim if she thinks it necessary, and she only bothers with pleasantries if there's something she wants.
- Gender Flip: The original Null from the Archie comics was male, but this version is female.
- Nigh-Invulnerability: She's almost impossible to kill. Even being shot at point-blank with heavy artillery does little more than knock the wind out of her.
- Pragmatic Villainy: Not one to let honor or revenge get in the way of what's practical or profitable. This is how the Mutanimals convince her to leave them alone and stop the mutant experiments; by simply making sure that those plans will be more trouble than they're worth. Of course, she never actually abandons her plans for mutants.
- Slavery Is a Special Kind of Evil: Madame Null's entire interest in mutants is to make the perfect slave labor.
Metalhead/"Metal Don"
- Ambiguous Situation: In issue 100 Donatello manages to overload his systems and he appears to be taken offline. In The Armageddon Game his body is used as Krang's new shell, and it's yet unclear whether the Metalhead personality remains or it's just Krang piloting. By the end of the event, Krang is most definitely Deader than Dead, and the Utroms dump Metalhead in a trash pile, just as his systems start rebooting...
- Go Mad from the Revelation: Finding out he's not the "real" Donatello, combined with being trapped in a robot body, did not go over well with him.
- Unwilling Roboticization: Big time.
Agent John Bishop
- Adaptational Karma: The original Bishop did have a Heel–Face Turn going for him but otherwise didn't suffer much comeuppance for his atrocities. In the IDW series, Bishops finally gets his when a Slash clone kills him on the spot.
- Adaptational Personality Change: The original Bishop was fairly calm and composed despite his xenophobia while this incarnation is far more deranged and prone to rambling with his xenophobic tendencies being more prominent.
- Adaptational Villainy: The original Bishop was a bad guy responsible for a lot of suffering but was given a few sympathetic motives and a traumatic backstory involving alien abduction to balance him out, in addition to eventually undergoing a Heel–Face Turn where he turned his back on his xenophobic ways and brought peace to the world. IDW Bishop has what can be seen as a Freudian Excuse story but otherwise commits ruthless acts without remorse, has far fewer sympathetic moments to balance out his Kick the Dog excesses, and gets killed in the end by a Slash clone without him undergoing any kind of self-reflection or ultimate Heel–Face Turn to become a better person.
- Adaptational Wimp: The 2003 Bishop was originally an able-bodied civil war era soldier who, after being abducted by aliens, was granted longevity and superhuman abilities. This incarnation has a severe deformity that leaves him helpless without a Mobile Human Suit.
- Ambiguously Human: He's able to keep up with the turtles and more, border-lining on superhuman. Wounds to his head reveal that at least some of his body underneath the skin is metal.
- It's revealed that he is technically human, but was born with severe physical deformity that has left him at the size of a child and with high-level intelligence. His "body" is actually a humanoid mech-suit his father commissioned so he could look normal.
- Badass in a Nice Suit: As always, with Cool Shades to go with it.
- Composite Character: His fighting skills and personality are very much in line with his 2003 incarnation with the xenophobia dialed up, but his true form bears more of a resemblance to his 2012 incarnation, if much, much different.
- Depraved Dwarf: This version of Agent John Bishop was born with dwarfism. He was fed xenophobic rhetoric by his father, and who also commissioned a mech suit modeled after himself as he believed a man should look like his father. John is possibly the most sadistic character in the entire book, often taking pure delight in the torture, murder, and enslavement of non-humans.
- He Who Fights Monsters: His father, in a Moment of Lucidity, warned him about this. He didn't care to hear it.
- Hypocrite: He fails to comprehend that he and his methods are far worse than the threats he moves to destroy. He was even willing to ally with the mutant Splinter and the Foot clan to fight off the Triceraton war (which began after the Triceratons announced their arrival peacefully and escalated after Bishop's forces attacked on sight).
- He's also far from averse from using mutants for his own ends, seen when he captures and brainwashes Slash and gleefully controls him like a puppet to brutalize the poor turtle's former allies. Especially twisted considering that Slash had been minding his own business at the time, peacefully sitting on a rooftop reading The Grapes of Wrath to a gathering of pigeons.
- Ignored Epiphany: When visiting his senile father, Wayne Bishop, in a Moment of Lucidity, warns his sons to tread lightly lest he becomes worse than the very monsters he hunts. His son remained ignorant of his own monstrousness to the bitter end.
- Inspector Javert: Crosses over with Fantastic Racism and Absolute Xenophobe. No mutant or alien is anything less than a monster requiring his extermination, as far as he's concerned. As pointed out below he'll even try to kill or capture mutants who had been normal humans mere seconds before.
- Kick the Dog: From his Fantastic Racism to anything that isn't human, to putting Slash under mind control, to surgically installing a nuke into Slash in case he ever had to abandon control of him in battle, this version of Agent Bishop is a nasty (and petty) piece of work.
- Shown full-force in issue 99, after Hob has used mutagen and turned a large crowd of people into mutants, Bishop instantly tries to either capture or kill them all, despite the fact that these had been normal humans mere seconds before.
- Kinslaying Is a Special Kind of Evil: When Hob attempts to hold his father hostage at gunpoint, Bishop orders a brainwashed Slash to kill him, declaring his father is merely a shell of the person he was and whatever Wayne had been lived on in him. Hob is absolutely horrified that Bishop would murder his own father.
- Laser-Guided Karma: After all he's done, Bishop ends up facing perhaps the most ironic sort of justice: having used a remote-controlled Slash to brutally crush his own father in the past, he ends up being stomped to death by a renegade Slash clone under the control of Hun.
- Mirror Character: To Krang, of all people. They're both rogue military leaders who will stop at nothing to eradicate all life on Earth that they believe doesn't belong, with little regard for the people whose cause they're supposedly fighting for. And that's without discussing the nature of their true bodies.
- The Paranoiac: His father, Wayne Bishop, was the founder of the EPF and was very much this. Nobody else in the task force believed his stories except his son, who had decades of paranoia heaped on him until John was even more xenophobic than he was.
- People Puppets: He puts a helpless Slash under mind control, directing him in battle by using a remote uplink that makes the subject imitate at least some of his movements.
- The Unfettered: He used a brainwashed Slash to murder his dementia-addled father when Old Hob held him hostage at gunpoint, claiming his father was merely a shell of the person he was and that whatever he had now lives in him now. This act of cruelty shocks even Hob.
Dragon
- The Anti-God: He is just as powerful as his sister, being destruction to her creation, and helped her create the world before turning evil. After that he became a mix of this and Satanic Archetype.
- The Corrupter: He has spend countless millennia infiltrating his sister's dreams and driving humanity to evil, including influencing the rise of Nazis.
- The Dreaded: Most members of the pantheon (Jagwar, Manmoth, Toad Baron, Rat King, Aka and Gothano) are quite disturbed of Kitsune plans of reviving him.
- God of Evil: When Brahma created him and Dreamer, he made them dual aspects. The Dragon represents the aspect of destruction. It is worth noting he didn’t start this way. He is acknowelged to be just as vital in creation of world as Dreamer, but his unending disatisfaction with their creations and refusal to accept humans being gifted with ability to create and destroy on their own drove him to evil.
- Greater-Scope Villain: Dragon is the creator of the Pantheon, making him indirectly responsible for all the damage their game has done, and Kitsune’s ultimate goal is his resurrection, making him indirectly responsible for the founding of the Foot Clan and Shredder’s Start of Darkness. The "Shredder in Hell" comic reveals not only was he more directly involved in it than previously assumed, having stirred Shredder and his predecessor to evil, but that he is also responsible for much of humanity’s evil and cruelty by corrupting his sister’s dreams.
- Killed Off for Real: Kitsune's plans to sacrifice Karai to untether Dragon from the netherworld were thwarted and Splinter resurrected Saki at the cost of his own life. With Saki now free from his influence, the Dragon lost his vessel and was defeated, his body left dead over New York.
- The Perfectionist: He was never satisfied with what he and Dreamer created, destroying their creations countless times and eventually creating the Pantheon as his pet project. His inability to accept flaws in their creations, plus humans being gifted with same ability to create and destroy as him and his sister, led to his descent into evil.
- Sealed Evil in a Can: In order to stop his rampage, the Dreamer designed a mortal soul as a prison for him, binding him to the same cycle of death and rebirth that all living beings suffer.
Darius Dun
- Adaptational Badass: His original incarnation relied on Powered Armor when forced to fight. Here, he has raw strength.
- Adaptational Curves: His original incarnation appeared quite chubby. Here, he was a former athlete and has the body to prove it.
- Adaptational Karma: His original incarnation in Fast Forward was still at-large by the end of the series without any word as to what happened to him. In this series, he dies at the hands of Jennika by Splinter's command and then returns as the main villain of the second TMNT/Ghostbusters (IDW Comics) crossover in the form of a Ghostbusters ghost, leading to him getting busted and imprisoned in the ghost containment unit forever.
- Genius Bruiser: Despite being an athlete, since high school he has believed that science was the way to success. He's also capable of taking out at least a dozen Foot ninja at once.
- High-Class Glass: Wears a monocle much like his original incarnation.
- Man Behind the Man: Is the one behind the Street Phantoms, as they work as his goons.
- Unrelated in the Adaptation: His original incarnation was the uncle of Cody Jones, though it wasn't fully established if he was one of Casey and April's grandsons or simply married into the O'Neil-Jones family. Here, Darius is a contemporary to Casey and April, being apparently older than them by a few years. And with Cody out of the picture, no familial relationship, whether by blood or by marriage, exists between him and either April or Casey.
- Xanatos Gambit: After his goons kidnap Harold, he posits him a deal: work for him willingly or not. He says that in both outcomes he has something to gain: if Harold works for him, he would gain a valuable partner, while if he doesn't, he would have his men raid Harold's complex and steal his tech.
Jasper Barlow
- Back-Alley Doctor: He's a doctor of questionable background who runs a reconstructive surgery clinic out of a filthy hovel who performs cruel procedures on the desperate and unsuspecting mutants who visit him.
- Composite Character: To Doctor Feral and Otto Rattus from Teenage Mutant Ninja Turtles & Other Strangeness tabletop game. Like Doctor Feral, he's a polite evil scientist obsessed performing inhumane experiments on mutants. Like Otto Rattus, he's a rat mutant who has undergone heavy treatments to appear more human. And like Feral, he as a group of small, cute-in-a-hideous way henchman, the Night Terrors (Feral had the 'Terror Bears').
- Facial Horror: He has performed surgeries on himself to in attempts to look more human like with less than ideal results. His most notable feature is a patchwork-like human face stretched and sewn around his head like a mask.
- Fantastic Racism: Despite his goal being to help mutants look more human, he has an open dislike for nonmutated humans and refuses to treat them in his clinic.
- Fate Worse than Death: He is effectively given this treatment by Venus and Mushroom, when they turn him into a normal rat, with his intellect left intact. He survives the wrath of the mutants he abused, but he would much rather die than have the last shreds of his former human appearance taken away from him.
- Faux Affably Evil:
- In his first appearances, he was incredibly creepy but he was also very polite. However, it's quickly established to be completely unhinged and depraved, using the mutants who come to him in torturous experiments.
- He claims to have been working to save Venus's life when really he was using her as a guinea pig for his cosmetic surgeries and his experiments with the Dragon's scales.
- Laser-Guided Karma:
- When Seri is fleeing from Ch'Rell, she crashes her scout ship directly into Jasper's clinic.
- He experimented on countless mutants, including children, in an attempt to make himself human again. He was turned into a normal, but still sentient, rat by Venus and Mushroom, two of his test subjects.
- Mad Doctor: He more than fits the bill, tricking mutants into coming into his clinic before mutilating and dismembering them for his experiments.
- Not-So-Well-Intentioned Extremist: He claims that his experiments are a necessary evil in order to cure mutation and give mutants back a normal life. In practice, however, he is a deranged, narcissistic psychopath whose true motivation is to regain fame he had as a human and is unable to comprehend that some mutants are happy how they are.
- Terms of Endangerment: He renamed Bonnie "Venus", showing that he views her as more personal work of art rather than her own person.
- Uncleanliness Is Next to Ungodliness: He and his clinic are absolutely filthy.
