A list of characters in all three series. Beware of spoilers.
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The Teenage Mutant Ninja Turtles
In General
One-half of the series' main heroes. A group of four mutated, anthropomorphic Turtles mentored by Master Splinter into battling the Foot Clan's forces.
Leonardo
The Turtles' leader and in control, but finds his position challenging and strenuous even though the rest of his brothers depend on him a lot.
- Interspecies Romance: Ends up forming a relationship with Elsa.
- The Leader: As in canon, Leo is this for the Turtles as a whole.
Raphael
The more brute-like of the Turtles. While he's a bit of a jerk, he's capable of caring and protecting the rest of his family and his friends.
- Interspecies Romance: Forms a bond with the alien warrior Mona Lisa.
- You Are Better Than You Think You Are: In Into the Unknown, Raphael basically gets this speech from the Fifth Spirit when the turtles are contacted by each of the elemental spirits, the spirit assuring Raphael that he has learnt to channel his anger to protect others.
Michelangelo
The wisecracker of the bunch who serves as the team's primary source of comic relief, though he can be a capable fighter when push comes to shove.
- Dumbass Has a Point: It’s only made in hindsight, but when even Michelangelo thinks Anna getting engaged to Hans the day they met was a stupid call, it’s clear that she made a really bad decision.
- The Nicknamer: Michelangelo often attempts to nickname their enemies, such as attempting to name Dredd, the head of the Night Blade assassins, "Head Blade", or re-naming Marshmallow "Snowliath" (although his suggestion of "Scorpi-Duke" for the mutated Duke of Weselton seems to have been accepted). In Into the Unknown, he is the one to name the wind spirit "Gale" rather than Olaf, and calls the Nokk "Neptune" due to its ties to Poseidon in mythology, although Donatello and Elsa name the Earth Spirit "Fuji" after they find it later.
Donatello
The genius of the quartet who is responsible for many of the team's gadgets and weaponry while also packing a punch himself.
- Badass Bookworm: Even with the expanded family of the Arendelle royals, Donatello is still the smartest person in the group.
- Genius Bruiser: As in many versions, Donnie is the smartest of the Turtles but a dangerous opponent in a fight.
- Interspecies Romance: As in canon, Donatello is interested in a relationship with April.
- The Mentor: A low-key example of this, as he ends up giving Anna some instruction in science during their time in space.
The Arendelle Royals
In General
Elsa
The cryokinetic queen of Arendelle whose kingdom (and life) is turned upside-down by the appearance of the Turtles, and subsequently the Foot Clan and the Kraang. Later on, she learns to become more competent in terms of combat thanks to the Shredder's attacks on her world.
- Beware the Nice Ones: When Elsa is sufficiently enraged, she manages to freeze an entire planet in eternal winter.
- Combat Pragmatist: By the time of Into the Unknown, Elsa has developed enough combat experience to be considered this, such as catching an opponent off-guard by freezing the ground to make her enemy slip.
- Godzilla Threshold: In Frozen Turtles in Space, Lord Dregg pushes Elsa so far that she condemns his entire planet to an eternal winter, and even Anna has no problem with them inflicting such a fate on Dregg's people after everything he's done.
- Kung-Fu Wizard: Elsa grows into this as the storyline goes on, mixing up blasts of ice magic with ice weapons like katanas and gauntlets.
- "The Reason You Suck" Speech: Frozen Turtles in Space sees Elsa basically deliver one to the Triceratron Commander Zanmoran when she realises that she froze his heart earlier, as she informs Zanmoran that she couldn't 'fix' him even if she wanted to as only an act of true love could thaw a frozen heart and she can think of nobody who would ever love a monster like Zanmoran enough to pull that off.
- Took a Level in Badass: Elsa was already powerful due to her powers, but lessons with the Turtles give her a fair knowledge of hand-to-hand combat, and she learns to use her powers in more varied ways than just lashing out and hoping to hit something.
Anna
Elsa's sister who finds herself wanting to help more in no part due to the threat that they face.
- Crouching Moron, Hidden Badass: Anna starts out with limited knowledge of combat, but at one point she manages to incapacitate Bebop and trick Rocksteady into knocking himself out by provoking him to charge into a statue. At the same time, she was able to sneak around a Foot Clan base just as well as the Turtles.
- Didn't Think This Through: Anna falls victim to this on a fairly regular basis, such as when she grabs a sword when confronted by Rahzar without taking into account that she doesn’t know how to use it.
- Guys Smash, Girls Shoot: As the least skilled fighter of the group (apart from Olaf, for obvious reasons), Anna tends to join in fights by using stolen Kraang weapons.
- Hidden Depths: While Anna comes from a more primitive culture, she’s often the Arendelle resident who’s quickest to understand the higher science behind the Turtles and their enemies. During their time in space, Anna even serves as Donatello’s unofficial assistant as he’s analysing alien technology.
Kristoff
Anna's love interest and an ordinary ice harvester who is forced to fight due to the world's newfound conflict.
- Badass Normal:
- Wacky Marriage Proposal: Kristoff is shown contemplating using one of these in Into the Unknown, but Splinter (who Kristoff asked for advice as the only person in their social circle who's been married) advises him to keep it simple as Anna would appreciate the gesture more than anything else.
Sven
Kristoff's rather quirky reindeer. During Frozen Turtles in Space, he gets subjected to some mutagen and becomes an anthropomorphic reindeer capable of thought and speech, and assumes the role of the royals' strongman.
- Adaptational Species Change: While he starts out as a standard reindeer, exposure to mutagen turns Sven into a humanoid being capable of thought and speech.
Olaf
A lovable, hug-loving snowman who often gets into Raph's angrier tendencies due to his attittude.
- Cloudcuckoolander: Olaf, to the point that he spent time walking through a battlefield waving at Kraang and giving them names (albeit just numbers, but he at least believed he could tell them apart).
- Comically Missing the Point: In Into the Unknown, Olaf assumes that the Northuldan people and Arendelle soldiers they encounter are shocked that he isn't wearing clothes rather than realising that they're shocked that he exists in the first place. Later, when Rahzar threatens to eat his and Mikey's bones, Olaf simply points out that he doesn't have bones rather than respond to the original threat.
- Good Cannot Comprehend Evil: Olaf is so incapable of comprehending how bad Shredder is that he suggests giving the villain a hug until he actually meets their enemy directly and sees how terrifying he is. This is taken to a further level in Into the Unknown when Olaf witnesses the mutated Shredder freely admit his role in the death of Tang Shen and nearly beat Karai to death, the innocent snowman obviously traumatised and unable to comprehend the idea that anyone could do that to their daughter.
- No-Sell: Olaf is immune to most mind-reading methods as he doesn’t have a brain.
Allies
Master Splinter
The mentor to the Turtles, he's also the former Hamato Clan leader whose life was ultimately changed by the evil Shredder. He's forced to relocate to New York, but he later finds himself in the midst of Arendelle's conflict.
- An Arm and a Leg: In Into the Unknown, during the final battle with Shredder, Splinter loses an arm before he’s killed.
- Heroic Sacrifice: In Into the Unknown, Splinter basically attempts one when he charges Super Shredder, but although Splinter dies Shredder survives.
- Parental Substitute: In the course of their time together, the Arendelle royals in particular come to see Splinter as a father figure, such as Kristoff asking for his advice on how to propose. Ultimately, after Splinter’s death, Elsa erects a memorial for Splinter next to the graves of her own parents, affirming that he was a father to the royals as well as the Turtles.
Karai
The Shredder's "adoptive" former daughter who is later part of the Turtles' inner circle and later on becomes involved in the overall conflict.
- Adaptational Heroism: Downplayed. Though Karai starts good here, it's because the story begins after the events of her canonical Heel–Face Turn.
- Empowered Badass Normal: Karai is a trained ninja from her youth but she can also transform into a snake-like form.
- "I Know You're in There Somewhere" Fight: When Karai first loses control of her snake-self, Anna attempts to do this for her, but Splinter has to step in as Anna doesn’t know Karai well enough.
- Unbuilt Trope: Though Karai fits the bill as the "Noble Demon who defects to the heroes' side when they usually don't in canon" archetype (even though she actually sticks in terms of her Heel–Face Turn in canon), she instead starts out firmly on the heroes' side and the only time she's antagonistic is when she loses control of her snake-self. Later versions of the character archetype play out their stint in the villains' side normally and then make the proper defection, such as her iteration in Worlds Collide (TMNT) which is based on her 2003 iteration.
The Mighty Mutanimals
- Berserk Button: Leatherhead flies into a rage when anyone mentions the Kraang, much to Anna’s regret when she unwittingly provokes it.
- Gentle Giant: Leatherhead is a particular example of this, the royals quickly bonding with him despite his ferocious appearance.
- Hero of Another Story: The Mutanimals are brought to Arendelle to assist against the Foot.
- Insufferable Genius: Rockwell comes across as this with his insistence that he’s smarter than Donatello.
April O' Neil
- Drunk on the Dark Side: Into the Unknown sees April fall victim to the influence of her Aeon crystal, before Elsa manages to trick the possessing spirit into leaving April’s body so she can kill it.
- My God, What Have I Done?: April is horrified when she is freed from the Aeon spirit and recalls what she did to her friends.
Casey Jones
- Adapted Out: His "This is awesome!" line from the canon version of "Annihilation: Earth Part Two" is cut, because the author couldn't fathom how he could possibly that excited after his planet and almost everyone he knew were destroyed by the black hole.
- The Team Normal: Casey is the only New York ally of the Hamato clan to be totally human, with everyone else either mutants or enhanced humans.
The Foot Clan
In General
The primary rivals to Hamato Yoshi and his family, the Foot Clan has waged war with the Hamato Clan since ancient times long past, and moved to New York to continue their battle. Later on, they involved Arendelle in their conflict due to the nature of Elsa's powers.
The Shredder
The series' primary antagonist amidst everyone else. He leads the Foot Clan against the Turtles and later discovers their presence in Arendelle but diverts his attention towards Elsa, whose powers he wants for himself. Later on, in Into the Unknown, he becomes the Super Shredder, with the ice powers he so coveted from Elsa.
- Adaptational Karma: In canon, after he literally backstabbed Splinter before he could stop the Heart of Darkness, thus dooming Earth to annihilation, Shredder got no comeuppance other than being killed in the destruction of Earth. Here, when he does the same thing, Karai personally stabs him in the neck before throwing him into the black hole.
- Attack Its Weak Point: In the final battle, Elsa realises the mutated Shredder still has a heart, giving them something to focus on when attacking him.
- Badass Normal: Even when only human, Shredder manages to hold his own against the Turtles, Karai, Elsa and Anna all at once.
- The Corruptor: Shredder had plans to be this for Elsa, but she was rescued before he could do more than talk about his plans to force her to become his weapon.
- Crossover Villain-in-Chief: The first of many Iron117Prime main villains and the one whose actions they owe to, such as infusing dread upon the newer protagonists, being portrayed with little to no lightheartedness or comedy, and killing off the other villains when they try to usurp him.
- The Dreaded: It doesn’t take long for Shredder to establish this kind of reputation in Arendelle; after seeing how skilled the Turtles are at hand-to-hand combat, it is naturally disturbing for the Arendelle royal family to learn that Shredder nearly killed them in his first confrontation with them. During Into the Unknown, the entire cast show fear when they receive confirmation that Shredder is still alive.
- Eviler than Thou: Shredder proves himself to be the series' ultimate villain, managing to kill off Prince Hans when he tried to overthrow the ninja master, then posing a big threat to the royals of Arendelle.
- Expy: His canon skillset get's mixed up once he transforms into Super Shredder by adding a sample of Elsa's DNA, effectively turning him into a monstrous Sub-Zero, who himself was based on Shredder.
- Face Death with Dignity: In the final battle, Shredder calmly looks at Elsa and Leonardo after they deliver fatal wounds and compliments their attack with his Last Words.
- Knight of Cerebus: Almost none of his scenes are played light-heartedly or for comedy. In particular, the Turtles fear trying to bring him up in conversations with the royals until he starts getting involved hands-on.
- Motive Decay: The Shredder starts off wanting to kill the Turtles and their friends to eliminate a threat to his criminal empire and his own personal power. By the climax of Into the Unknown, all he wants is kill them and everyone else in both worlds. Even his minions are disturbed by the change in attitude.
- Self-Serving Memory: By Into the Unknown, Shredder's vendetta against Splinter has reached the point that he's convinced himself that Splinter killed Tang Shen and stole Miwa from him, even though Shredder was the one responsible for both those crimes. He overcomes this 'delusion' in Ahtohallan, but simply uses his new epiphany to abandon any remaining humanity.
- Then Let Me Be Evil: The best description of Shredder's attitude in Into the Unknown; while meditating at Ahtohallan, he is forced to acknowledge that he basically invented reasons to hate Splinter and warped his own memories of his actions regarding Tang Shen and Karai to make himself the victim rather than the villain, but ultimately decides that he can live with that in the name of power, proclaiming himself the Spirit of Death just as Elsa is the representation of the Spirit of Life.
- Vile Villain, Saccharine Show: The animated Frozen movies are rather light-hearted, but the Shredder manages to take things in a much, much darker direction.
- Villain Takes an Interest: After learning about Elsa's powers, Shredder becomes interested in trying to harness them himself. Initially, he tries to get Elsa herself to join him, but once it's made clear that she never will, he instead becomes obsessed with trying to gain her powers for himself. When he becomes Super Shredder, he succeeds in infusing himself with mutagen programmed with Elsa’s DNA, and becomes far more dangerous.
Tiger Claw
- An Arm and a Leg: Loses one arm in the final confrontations in Northuldra.
Baxter Stockman / Stockman-fly
- It Works Better with Bullets: The turtles and Anna are amused that Baxter Stockman tried to attack them with only one grenade on his first assault on Arendelle, prompting Anna to muse that Stockman clearly isn’t their smartest enemy.
- Small Name, Big Ego: When Baxter Stockman first appears in Arendelle, he tries to present himself as the Turtles’ arch-nemesis, but they can’t even get his name right, and Michelangelo muses that they have nemeses ‘way more archer than him’. When he attempts to proclaim himself the Shredder's deadliest henchman in a later confrontation, the Mutanimals point out that when Shredder has Rocksteady, Bebop, and Rahzar in his service, even Fishface is scarier than Stockman.
Bebop and Rocksteady
The Rat King
- Dies Differently in Adaptation: The Rat King is shown to have survived his canonical death in Season Two (although
Word of God notes that all of the Rat King’s appearances were written before it was known that the character was dead already), but dies in Northuldra.
Rahzar
- I'm a Humanitarian: Suggested; when the two groups find the ship Elsa and Anna’s parents were on when they disappeared, Rahzar asks if there are any bones for him to gnaw.
- Killed Off for Real: In Into the Unknown, Leatherhead drowns Rahzar to stop him killing Anna.
Fishface
- Even Evil Has Standards: Explicitly questions what the point of the Shredder’s vendetta is after a certain point, wondering what they would actually do after the Hamato Clan are dead.
Chrome Dome
The Kraang
In General
Kraang Sub-Prime
The Triceratrons
Other Characters
Hans
- Asshole Victim: Nobody is particularly sorry after Hans is killed by the Shredder.
- Big Bad Wannabe: Hans is ruthless and ambitious, but compared to Shredder he’s a rank amateur at best.
- Not So Similar: Hans compares himself and Shredder on their first meeting as people who seek power despite the opposition of others, but Shredder makes it clear later that he disagrees with that assessment, as Hans was born a prince with all the accompanying status where Shredder had to fight for everything and has earned his reputation.
- The Sociopath: Hans is strongly implied to be this, to the point that he wonders if the way he reacts to the Shredder’s threats is what ‘fear’ is.
The Duke of Weselton
- Adaptational Badass: The Duke actually becomes a physical threat when exposure to mutagen turns him into a part-scorpion mutant.
- Unskilled, but Strong: After exposure to mutagen, the Duke of Weselton’s new scorpion state is powerful enough to take on the Turtles, Elsa and Splinter despite the Duke showing no signs of being a skilled fighter when he was human.
Dregg
Marshmallow
- Fluffy the Terrible: Brought up; when the Turtles first meet Marshmallow, Karai and Raphael question why the big, intimidating snowman is Marshmallow while the little one is Olaf, feeling that it should be the other way around.
Professor Honeycutt
- The Mentor: Acts as this to the Earth residents once they go into space.
- Spared by the Adaptation: Where he committed a Heroic Sacrifice in canon, after he did that to end the battle against the Triceratons, the Turtles’ allies were able to contact his past self, and Renet gave the younger Honeycutt the memories of his older self.
