People of Falaina - Residents
Voiced by: Natsuki Hanae (Japanese), Johnny Yong Bosch (English), Carlos Siller (Latin-American Spanish)
A clumsy 14-year-old boy, who's also the archivist of the Mud Whale.
- Action Survivor: Aside from his brief stint during the first attack, he doesn't do much in the way of direct fighting. Nevertheless, he's always there whenever the others head into danger.
- All-Loving Hero: He cares deeply about everyone—including people he's never even met—and very much believes that not all people are bad, even after all the cruelty in the world he ends up witnessing.
- Break the Cutie: Separated from his childhood friend so brutally and suddenly that it takes him a while to compute what just happened.
- Despair Event Horizon: He nearly crosses this at the beginning of the series, both in part due to Sami's death and due to realizing how cruel the world really is. He's brought back when he realizes that he still has a role to play, and that the island is about to sink soon and that he has to stop it.
- Foregone Conclusion: A minor example. A brief flash-forward into the future confirms his (and Kikujin's) survival, but not much else.
- Friend to All Living Things: He quickly takes on Ham as a Team Pet, whereas everyone else typically assumes that Ham's food.
- The Heart: Neri sees him as this. He tends to act as this particularly for Ouni, serving as a bit of a Living Emotional Crutch / Morality Pet after Nibi's death.
- I Let Gwen Stacy Die: He feels as though he failed to protect Sami, who died right in front of him.
- Kiddie Kid: Sort of. He's not especially immature for his age, but he's hopeless enough that Tobi's kid siblings are looking after him more than the other way around.
- Mr. Exposition: Being a compulsive archivist, his writings serve as voiceover narration to explain various aspects of life on the Mud Whale or how Thymia works − or just the general feelings of the island's inhabitants.
- Nice Guy: The guy is incredibly nice.
- Power Incontinence: He has very little control of his thymia, causing people to jokingly call him "the destructor". He also can't refrain himself from writing down everything he sees, to compulsive disorder levels. Both are why the job of "archivist" was created specially for him.
- Supporting Protagonist: Though he narrates the story and helps move it along in his own way, it's ultimately Lykos, Suou, and especially Ouni that the series is truly about. Neri lampshades this, noting that although it may not seem like Chakuro can do much, he's the heart that ties them together.
- They Look Just Like Everyone Else!: He struggles this when he sees Orca's face for the first time. Not only because of his resemblance to Lykos, but because as Chakuro thinks, it would be so much better if Orca looked like the monster Chakuro wants him to be, as he'd feel less guilty about hating him.
- Tragic Keepsake: Keeps one of Sami's ribbons after her death.
Voiced by: Manaka Iwami (Japanese), Melissa Fahn (English), Betzabé Jara (Latin-American Spanish)
A mysterious girl found by Chakuro on a drifting island. She's the sister of a general in the army of a great empire where people grow up and live without emotions.
- Animal Theme Naming: "Lykos" means "wolf" in Greek.
- Big Brother Worship: Her brother used to be the center of her world. The events of the series swiftly make him a Broken Pedestal for her.
- Big Damn Heroes: For Chakuro during the first attack.
- Child Soldier: Was enrolled into a military academy at the age of seven, and was an active soldier at fourteen.
- Defector from Decadence: She ultimately refuses to return to the Empire, having realized the value of emotions and that the Mud Whale doesn't deserve to be slaughtered, unlike what she was taught.
- Defrosting Ice Queen: Being taken away from the Nous Lykos causes her emotions to resurface, as she quickly warms up to the Falainians.
- Despair Event Horizon: She hasn't crossed it, but Orca intended for her to, by killing the people of the Mud Whale that she'd grown to love. In the process, her grief was meant to create another Daimonas.
- Due to the Dead: The first sign that she isn't such a bad person after all is the fact that she personally buried her fallen comrades, even if the people of the Mud Whale find it a bit eerie that she apparently felt nothing over this.
- Emotionless Girl: At least at first, due to giving her emotions to her Nous. She describes growing back emotions as "painful" at first.
- Little Miss Badass: During the first attack, she's the only one besides Ouni who honestly does anything effective against the Empire forces.
- Mr. Exposition: Not to Chakuro's extent, but she knows more about the island and the mysteries of how it functions than most of the cast, and thus she's inevitably the one to explain them most of the time.
- Mysterious Waif: Downplayed. She's really only mysterious because the people of the Mud Whale know next to nothing about the outside world, and not because she herself is hugely important to the world, but she certainly comes off this way to the cast at first.
- This comes back to bite her when the twins point out that all of the island's misfortune started after she showed up (not false, strictly speaking) and suggest that she's been a spy from the very beginning (actually false). Knowing that her presence will be a weapon they can use, she chooses to leave the island in secret.
- Not So Different: She can't bring herself to kill Orca's Insect Cage, as she sees herself in them and knows that they aren't evil—just unaware that there's more to the world than killing.
- Safety in Indifference: At the very beginning, the idea of regaining her emotions terrifies her.
- Sole Survivor: Of the Lykos ship.
- Starting a New Life: After realizing that the people of Mud Whale aren't "sinners" who deserve to be wiped out, she chooses to fight on their behalf and is pretty much exiled by her brother to it.
- Sugar-and-Ice Personality: After she defrosts. She's still a fairly aloof girl most of the time, but can also be rather sweet when she wants to be.
- Unwitting Pawn: Orca's. While there's obviously a reason he left her behind on the Mud Whale, no one knows what it is.
- You Are Number 6: Before she's given the name Lykos on the Mud Whale, she was only known as Number 32 of the Lykos, referring to the ship name. After her brother abandons her, he labels her as "Sample no. 4 of the Skylos".
- You Can't Go Home Again: For all intents and purposes, she's been exiled to the Mud Whale.
- You Gotta Have Blue Hair: Her hair is teal.
Voiced by: Hisako Kanemoto (Japanese), Christine Marie Cabanos (English), Monserrat Aguilar (Latin-American Spanish)
A childhood friend of Chakuro and the younger sister of Suou.
- Childhood Friends: With Chakuro.
- Dead Star Walking: Voiced by a veteran seiyuu, looks initially important and dies two episodes in.
- Dies Wide Open: She is killed with her eyes open Chakuro close her eyes off screen.
- Dying Declaration of Love: Or in her case, Post-Mortem Declaration of Love. As a ghost, she admits her feelings to Chakuro.
- Hair of Gold, Heart of Gold: A genuinely kind and sweet girl, making her death all the sadder.
- Sacrificial Lamb: She's killed by Empire forces at the end of episode 2.
- Taking the Bullet: Possibly. Right before the guns fire, she subtly positions herself in front of Chakuro, whether meaninglessly or subconsciously, and there's a reason she dies while he doesn't.
- Twice Shy: It's heavily implied that her relationship to Chakuro is something like this; while they both care deeply about one another, they're too shy to make anything of it.
- What Could Have Been: In-Universe. If she hadn't died, she would almost certainly have grown up to marry Chakuro, which they both acknowledge.
Nezu and Ro
Nezu: Voiced by: Mutsumi Tamura (Japanese), Ben Pronsky (English)
Ro: Voiced by: Shinsuke Sugawara (Japanese), Jason Palmer (English)
Friends of Chakuro and engineer partners.
- Blind Without 'Em: Ro. It's a bit of a Running Gag during the bathing chapter, as he's unable to see anything going on.
- Cannot Talk to Women: Nezu, making it awkward for him when he realizes his idolized "Master Yano" is a girl.
- Conveniently an Orphan: Ro is a rare aversion in this series. His mother is a still living Unmarked (Kanae of Taisha/Suou's attendants, to be specific), and rescuing her when she's taken hostage like many other Unmarked motivates Ro to join the rescue attempt.
- Determinator: A stoic version, but Ro, as Nezu observes, has an iron will and won't even consider the possibility of dying during the attack. Or, similarly, being left behind when his mother is one of the Unmarked hostages.
- Gadgeteer Genius: Not that their inventions seem to see much use, but they've got a lot of them.
- Giver of Lame Names: With much fanfare, Nezu names his and Ro's autonomous sand-throwing machine... the Autonomous Sand-Throwing Machine.
- Heterosexual Life-Partners: One can presume, given that they spend literally almost all their time together.
- Hidden Depths: Surprisingly for a fairly simple-minded character who'd mostly been presented as comic relief, Nezu wonders while preparing for the second attack if, had they been ready for war before, they could've saved Sami, who was like a little sister.
- Non-Action Guy: They're thymia users, but are self-admittedly not too good at fighting. In the manga, though, they do end up subverting it, as we see them participate in defending the Mud Whale during the Skylos attack (albeit crudely).
- Sadistic Choice: The twins gave Nezu one: reveal what he and the others learned about Ouni, or they'll go after Ro instead. To rub salt into the wound, they point out that it should be no contest, between Nezu's lifelong partner and a relative stranger whom Nezu knows mostly as a troublemaker—but Nezu is evidently still torn.
- The Stoic: Ro isn't very expressive. Lampshaded when, after even Ouni and Lykos are seen laughing, Nezu and Urumi promptly decide that it's Ro's turn now.
- Those Two Guys: Almost always seen together.
- What the Hell, Hero?: Due to Nezu's refusal to speak on the details of the Sadistic Choice the twins forced him through, Ro is left to believe that Nezu sold Ouni out for their inventions. He's understandably furious with Nezu for it, unaware that Nezu actually sold Ouni out for Ro's sake.
Voiced by: Mikako Komatsu (Japanese), Reba Buhr (English), Fernanda Gastélum (Latin-American Spanish)
A cheerful member of the Mud Whale's Self-Defense Force.
- Action Girl: As expected of a soldier.
- Boobs of Steel: One of the best fighters on the island − most certainly the best female one − and quite busty by the series' standards.
- Cool Big Sis: At least self-proclaimed towards Chakuro. She's very protective of the boy.
- Genki Girl: Always full of energy.
- Never Learned to Read: Which makes her hilariously useless when the gang tries to investigate via reading journals.
- The Nicknamer: Likes giving people nicknames. She refers to Chakuro as Chucky.
- Perky Female Minion: A bit of one to Shuan. She has no problems dealing with his bleak outlook on life and is happy to counter it with endless optimism.
- Plucky Girl: Retains her optimism despite the brutal attack on the Mud Whale in episode 3 and tries her best the cheer Chakuro up.
- Power Trio: Frequently seen with the same two SDF members.
- You Are in Command Now: Shuan leaves the SDF once they reach Amonlogia and appoints Ginshu as the new captain in his stead—at which point she's abruptly thrown into a situation she doesn't know how to handle as chaos erupts once news of hostages arrives.
Voiced by: Yasuaki Takumi (Japanese), Tony Azzolino (English), David Allende (Latin-American Spanish)
- Almighty Janitor: He's not part of the defense force, but is skilled enough to be asked to join, which he refused.
- Childhood Friends: With Kuchiba.
- Everyone Can See It: His crush on Shinono is noticeable to everyone but Shinono herself.
- Friend to All Children: Says outright that he likes taking care of kids, and is a good friend to the rest of the cast, who are primarily made up of children.
- Good Is Not Soft: As the conflict goes on, he resolves himself to be ruthless so that others like Kuchiba won't have to live with the burden.
- Outliving One's Offspring: His wife and child died in a sand accident.
- Sacrificial Lion: Dies of old age in the last episode of the anime. He lasts a bit longer in the manga, but not by much.
- Spirit Advisor: After his death, Neri brings his spirit back to help pull Ouni out of his funk.
- Vitriolic Best Buds: He and Kuchiba constantly bicker.
- Your Days Are Numbered: 28 at the start of the series, and as such he's at the limit of his short life.
Voiced by: Makoto Furukawa (Japanese), Brian Beacock (English)
A Marked. Chakuro lives with him and his many siblings.
- Big Brother Instinct: During the initial attack, if he hadn't been physically held back, he would've jumped right into the fray to protect his siblings.
- Massive Numbered Siblings: Has several younger siblings. Chakuro lives with him in return for helping to look after them.
- Nice Guy: Nagging to Chakuro aside (and even then, Tobi still cares about him at heart), he's consistently friendly and helpful to everyone.
- Promotion to Parent: For his siblings.
Voiced by: Hiroshi Kamiya (Japanese), Douglas Cavum (English)
The strongest member of the Mud Whale's Self-Defense Force. He is not far from the end of his Marked life.
- Adaptational Heroism: Mildly. The end of the anime has him civil, if even a tad encouraging to Ouni. In the manga equivalent, he was actually trying to Break Them by Talking. (On the other hand, in the anime, it's implied he was about to destroy Nibi and Ouni's childhood play area and he threatens Kicha, so he's still a jerk.)
- Asskicking Equals Authority: He's the strongest member of the Mud Whale's self-defense force, and also its leader.
- Big Damn Heroes: Here and there. He eventually admits to Ouni that he actually arrives on the scene early and waits for a good time to make his entrance, and even seems a little surprised that Ouni doesn't do the same.
- Break Them by Talking: He tries to do this on Ouni regarding how as a Daimonas, he'll be doomed to a life of solitude, with mixed results.
- Broken Bird: Male example. He's extremely bitter and no longer feels alive due to being a failed attempt at a Daimonas. In a twisted way, he acts as a mentor of sorts to Ouni, whom he sees as naively clinging to an impossible dream of happiness.
- Death Seeker: Initially. He later realizes that he still wants to live.
- Desperately Looking for a Purpose in Life: His raison d'etre. It's also why he softens up as time goes on, because eventually, all that's left to his existence is to protect the Mud Whale.
- Eyepatch of Power: Underlines his badassery, while hiding a seemingly disabled and rotten right eye. It also saves his eyesight when Duke Dachtlya, while trying to blind him, only cuts his visible eye. It turns out that he can still see through his hidden eye, though not well, and afterwards he switches which side he wears the eyepatch on.
- Eyes Always Closed: At least his good eye always looks closed.
- Eye Scream: The Duke of Amonlogia slashes his left eye to seal off his Thymia.
- Jade-Colored Glasses: Condemned to live a short life of a tiny island with no hope of a more fulfilling life in sight, he actually welcomes the Elders' mass suicide plan with open arms. And more generally, he acts pretty cold and heartless most of the time.
- Loss of Identity: How he felt after the failed attempt to turn him into a Daimonas.
- Not So Stoic: He appears unflappable, but after his wife commits suicide, and because of him, it's clear that he breaks down in his own way as he slices at grass and starts crying—the latter of which he's incredulous at.
- Red Eyes, Take Warning: During his fight with Ouni, his eyepatch is knocked off, revealing his hidden eye, whose sclera is dyed red.
- Stepford Smiler: Always has a cunning smile on his face, but couldn't be any less happy with his life.
- Took a Level in Kindness: He's less embittered after the island reaches Amonlogia, having realized that he actually does still want to live after all. And also, most likely, because their situation is so awful that even he can't bring himself to act like a Jerkass, though he denies any altruistic motivation behind his actions.
- Used to Be a Sweet Kid: If flashbacks are any indication.
- Wild Card: On one hand, he imprisons Suou when the latter protests the Elders' orders to sink the Mud Whale. On the other hand, he doesn't stop Chakuro and his friends from releasing him.
- Your Days Are Numbered: He's likely to die in the near future and knows it.
Voiced by: Ayaka Suwa (Japanese)
A Marked girl who befriends Lykos.
- Break the Cutie: She's still grieving over friends who died during the first attack, and then she participates in the Skylos infiltration mission... and ends up as one of the only survivors, which breaks her all the more.
- Driven to Suicide: When most of the Skylos assault forces are killed, she decides to stay behind on the sinking Skylos and die with them. Thankfully, Ginshu snaps her out of it.
- Lovable Alpha Bitch: Calls Chakuro, Nezu, and Ro dorks, appears to be the leader of a Girl Posse... and is eager to befriend Lykos, with no strings attached.
A Marked boy who takes part on the Skylos infiltration mission.
- Jerkass Has a Point: The reasonable counterpart to the twins, whom he sides with but admits to not trusting. Fuzzy is often the voice of dissent and isn't shy about it, but all he really wants is a proper plan to ensure that the most people survive—such as pointing out that they can't just move to the Mud Whale to save the Unmarked, since that would get everyone else on the island killed, including the children.
- Jerk with a Heart of Gold: Abrasive and tends to help the twins even in their less savoury plans, but he genuinely wants what's best for the island and has no issue with laying his own life on the line either.
- Nothing Personal: He agrees with Shikon and Shikoku's ideals, but doesn't share their contempt towards the Unmarked or Lykos.
- Only Known by Their Nickname: Everyone calls him Fuzzy (Mojamoja) as a reference to his hair, much to his dismay.
Voiced by: Ai Kakuma (Japanese), Cassandra Lee Morris (English), Lupita Leal (Latin-American Spanish)
Neri is a mysterious unmarked girl who serves the elders of the Mud Whale.
- Ambiguously Human: Although Neri is unmarked, she can induce visions on Chakuro, summon the spirits of dead people and project images of stars and galaxies. This trope is further supported by the fact that she calls the Nous Falaina her "mother".
- Mysterious Waif: At first thought to be just an unmarked girl who helps the elders, she then starts to appear out of nowhere to give visions and predictions to Chakuro and co., and seems to be closely related to the Nous Falaina. After she's absorbed into Faleina to heal it and prevent the ship from sinking, a "twin sister" called Aíma replaces her.
- Split Personality: Implied in the scenes where she shows strange visions to Chakuro and then snaps back to her human persona, as if the previous scene had never happened.
- You Gotta Have Blue Hair: Pink in her case.
Voiced by: Ai Kakuma (Japanese), Cassandra Lee Morris (English), Lupita Leal (Latin-American Spanish)
Aíma is the twin sister of Neri, and seems even more strange than her sister.
- Ambiguously Human: Like her twin, Neri, she looks like an Unmarked but displays odd powers. She too refers to the Nous Falaina as their "mother".
- Evil Counterpart: To Neri. Whereas Neri seems to wish for the best for the people of the Mud Whale, Aíma has somewhat more sinister and self-centered motives, including the fact that she doesn't mind leaving the Unmarked to die, since they aren't "food" and therefore provide no use to her.
- Grief Song: Sort of in volume 3/episode 7, when the battle between Skylos and Falaina is about to start, Aíma improvises a song calling on all the people buried in the sand. Except she sings it with a smile, and even a little dance in the anime.
- Mysterious Waif: Though she's much more expressive than other iterations of the trope, she still fits.
- Palette Swap: She looks identical to Neri but has a darker color palette.
- Power Gives You Wings: She seems much more in tune with her powers than her sister, and has the ability to sprout wings to fly or transform her body even further into some creature.
People of Falaina - Moles
- Childhood Friends: Aside from the twins, they've all known each other since they were kids.
- Forgotten Fallen Friend: Averted. Despite being extremely minor characters who died early on, Buki and Aijiro continue to be often present in Nibi and Ouni's thoughts. And Nibi's death definitely averts this.
- Lovable Rogue: They're pretty much delinquents, but don't do anything actually bad. An extra reveals that since they don't take part in chores, they hunt and gather for their own food, and if they want something from the farms, they exchange items for it (technically not allowed, though).
- True Companions: The twins aside, they're very close-knit.
- We Hardly Knew Ye: Buki is killed before even saying a single line; Aijiro doesn't fare much better.
Voiced by: Yuichiro Umehara (Japanese), Todd Haberkorn (English), Gerardo Alonso (Latin-American Spanish)
Leader of the moles, of group of troublemakers on the Mud Whale. Said to be the strongest thymia user of the island.
- The Ace: Not only he's considered the best thymia user on the Mud Whale, he's easily the best fighter among the people of Falaina.
- Achilles in His Tent: Shuan and the twins weren't doing wonders for his psyche to begin with, but after he loses control of his powers and accidentally hurts Kicha and Suou, he finally accepts that he's a threat to everyone around him and thus isolates himself, with the decision to stay behind as everyone else goes to Amonlogia. It's when he realizes that the others will die without him around that he returns to the scene, selling himself out to Amonlogia to prevent the rest of the Marked from being conscripted.
- Anti-Hero: Unlike most of the island, he has no qualms about murdering, imprisoning, and torturing the enemy. With that said, all of it is done for the sake of protecting everyone else (or because he's been pushed too far).
- Artificial Human: While not completely confirmed, it's widely assumed that he's a Daimonas as Miden was.
- Badass in Distress: He's defeated and captured by Orca at the end of Ch. 51.
- Big Damn Heroes:
- Though he's too late for Buki and Aijiro, he shows up just before the Empire forces can kill the rest of the bowel moles—at which point he exacts bloody vengeance.
- When Amonlogian forces are about to kill Shuan, Ouni promptly shows up to kill them. Shuan, being Shuan, complains that he should've gotten there sooner.
- Broken Pedestal: He wanted to see the outside world, Empire forces killing two of his friends changed that.
- Bullying a Dragon: Despite being the most powerful person in the series, Ouni apparently has a "kick me" sign on his back.
- When Arachni suspects him of being a Daimonas, he decides to... insult, attack, and provoke him. Suffice to say he deserved having Skylos destroyed after killing Nibi in front of Ouni. Orca lampshades it later on, in an In-Universe What an Idiot! moment.
- The twins, upon threatening Nezu into spilling what he and the others found out about Ouni, proceed to go straight to Ouni and taunt him with this newfound information. Shuan outright calls them idiots for somehow thinking it a bright idea to try and bully someone you're acknowledging as a "monster".
- While he doesn't go through with it and Ouni never finds out about it, Rochalizo's father was planning on killing Suou to demonstrate to Ouni that he was serious about killing the hostages if Ouni acted out of line. This definitely would've gone over well, since it's not like Ouni has a record of going on a Roaring Rampage of Revenge every time someone kills a friend of his or anything.
- Glass Cannon: Landing a hit on him isn't easy by any means, but as Orca notes, Ouni's still physically a teenage boy. Get a good hit on him and he'll go down.
- Gut Feeling: Apparently has a "my friends are in danger" sensor, seeing as how, down in the bowel area, he immediately realizes something is up when—unbeknownst to him—Buki is killed, in contrast to Masoh who's acting as his guard but fails to notice anything.
- Heroic Second Wind: Downplayed. He starts fighting back once Nibi shows up on the scene and does a rather impressive job of it for someone with two holes in his leg (and a slash wound across his chest), but it doesn't take long before adrenaline runs out and he collapses again mid-battle.
- Heterosexual Life-Partners: With Nibi. Ouni might not express it well, but the two of them are deeply attached to each other.
- "It" Is Dehumanizing: Orca, who views him solely as the Daimonas, pretty much refers to him in this way.note
- Long-Haired Pretty Boy: If Suoh is the "delicate and feminine guy" version, Ouni is the Tall, Dark, and Handsome one.
- Macguffin Super Person: He's apparently The Anti-Christ, or something to that effect. Amonlogia wants him dead, while Orca intends on capturing him.
- Magnetic Hero: The rest of the moles are devoted to him, he one-ups Suou's call to arms with ease (hence why Suou wants him to become leader for when they arrive in Amonlogia), and the twins know that if they have Ouni on their side, people will be far more inclined to join them.
- Meaningful Name: "Ouni" sounds similar to the Japanese word for "Demon". It later turns out he kind of is, receiving the nickname of "Daimonas" from the Empire.
- No-Nonsense Nemesis: He kills with startling efficiency and often without a word. Notably, the one time he doesn't—believing his opponent doesn't deserve a swift death—goes poorly for him, and he ends up defeated and captured.
- Not So Stoic:
- Nibi thought him to be Unable to Cry, but tragically, Nibi's death is what finally causes him to break down in tears.
- On the happier end of things, he is capable of laughing (sincerely). In the manga, he does so while watching the others' pitiful attempts at weapon training, while in the anime, he does so after witnessing Suou and Rochalizo bicker.
- One-Man Army: He can take out multiple enemies with minimal effort. When confronting the Amonlogia army, he flat-out states in a Badass Boast that he's worth hundreds of Marked.
- Person of Mass Destruction: As a Daimonas, he can destroy nous. Even in a normal fight, he's pretty much a walking force, to the extent that the others have to tell him to keep it down a little.
- Purple Is Powerful: His eyes are purple, and is the strongest thymia user on Falaina. And when he loses control after Nibi is killed, his thymia turns dark purple.
- Red Baron: Called the "Daimonas of Falaina" by the enemy due to his unusually powerful Thymia. Amonlogia knows him as "Sanatas", though both are written with the kanji for demon king.
- Roaring Rampage of Revenge:
- Against the invading forces after they murder a couple of his friends.
- Then again when Nibi dies.
- And a third time when he encounters Orca, the one behind the attack to begin with and therefore indirectly responsible for all of the above cases. Ouni's pretty fond of this trope.
- Sour Outside, Sad Inside: Chakuro figures out rather early on that even while Ouni's trying to Kick the Dog, it's only because he's covering up his grief through anger.
- The Stoic: Doesn't show a ton of emotion on his face, and Nibi notes that he's never seen him cry.
- Tall, Dark, and Handsome: Your typical black-haired pretty boy, who doesn't show a whole lot of emotion.
- Tragic Bromance: Nibi's death is what triggers his awakening as a Daimonas, and his memory continues to serve as a motivating factor for Ouni, who's still not entirely over his death.
- Traumatic Superpower Awakening: He unlocks his potential as a Daimonas only after witnessing Nibi's brutal death.
- Unusually Uninteresting Sight: No one ever comments on the fact that he's a walking nest of uijigoke (i.e. those fluffballs that always hang around him).
- World's Strongest Man: After he awakens as a Daimonas, Shuan notes that he could very well be the most powerful being in the world. With that said, he's hardly invincible, as he's still a teenager in the end—both in physical endurance and in the sense that he isn't always the most rational person around.
Voiced by: Atsushi Tamaru (Japanese), Kyle McCarley (English)
Ouni's closest friend, and former leader of their gang.
- Boisterous Weakling: He talks a big game and he is a decent fighter, but he's not as strong as the SDF—or Ouni, who in contrast is a No-Nonsense Nemesis. When the twins hear that he joined Ouni on the infiltration mission, they're convinced he's going to drag him down.
- Bromantic Foil: Ouni's closest friend, and a contrast to him in appearance, personality, and power.
- Died in Your Arms Tonight: Ouni's, though it's more like Collapsed Dead Into Your Arms.
- Does Not Like Shoes
- Gut Feeling: In the manga, one of his reasons for forcing himself onto the Skylos assault force is because he feels that if he doesn't, he'll never see Ouni again. In a way, he was completely right. If he hadn't been there, Ouni would've died; since he is, he dies in Ouni's place.
- Heterosexual Life-Partners: With Ouni. It's made clear that, despite not having been selected for the mission, he chooses to accompany the Skylos assault force so that he can fight by Ouni's side.
- Living Emotional Crutch: A bit of one for Ouni. Though Ouni can ultimately function without him, losing Nibi is what pushes him over the edge, and the twins accuse Ouni of losing all ambition due to Nibi's death.
- The Promise: He made one to Ouni as a kid: that one day, he'd take him to see the outside world.
- Tragic Bromance: He's on the dying end of this.
Voiced by: Ayaka Asai (Japanese), Cristina Valenzuela (English)
Another member of the moles, who grows fiercely protective of Ouni over the events of the story.
- Mouthy Kid: On the bratty side, but she isn't entirely wrong in what she says.
- Older Than They Look: She's actually only two years younger than Ouni. She's just really short.
- One of the Boys: Completely at home in an otherwise all-male gang.
Shikon and Shikoku
Shikon: Voiced by: Junya Enoki (Japanese)
Shikoku: Voiced by: Taku Yashiro (Japanese)
Two members of the moles who broke off from the core group.
- Break Them by Talking: They attempt this on Ouni in a mixture of wanting him to join them or, if that fails, at least wearing him down enough so that he won't interfere with them anymore.
- Fantastic Racism: They display disgust towards the Unmarked. See Jerkass Has a Point.
- Identical Twin ID Tag: Their most notable physical difference is the direction in which they part their hair. (For the record, Shikon's hair covers his right eye, while Shikoku's his left.) Other minor differences include whether or not their hair strands curl up or down, as well as the color of their bows.
- Jerkass: They insult Nibi repeatedly including after he dies, threaten Nezu and trash his and Ro's workshop, apparently make it their life mission to taunt Ouni at every possible opportunity, and constantly try to put down the Unmarked. Yeah, on an island of mostly well-meaning people, they come off as huge pricks.
- Jerkass Has a Point: Played with. It's not hard to understand where they're coming from when they talk about how, compared to the Unmarked, the Marked have done the most for the island during the conflict and yet receive the short end of the stick, and some people do give them that much, but any point they might have is otherwise overshadowed by the fact that they're huge assholes who don't exactly come off as voices of reason.
- Peek-a-Bangs: Both twins have bangs covering one eye to emphasize their rebelliousness and aloofness.
- Single-Minded Twins: Virtually indistinguishable both in appearance, personality, and role. They always act in sync, with no real differentiation between the two.
- The Social Darwinist: They believe that power should be everything on the island, hence why they hate the Unmarked, whom they perceive as dragging them down and using them.
- Stalker Without a Crush: Granted, it's a small island, but half of their scenes involve them spying/eavesdropping on Ouni, hearing about Ouni from the grapevine, actively trying to get more info about Ouni, or even just talking about Ouni. They're a tad obsessed.
- Smug Snake: They go on about how Might Makes Right... but end up cowering before Ouni at the very same rally, proving that they're more bark than bite.
- Theme Twin Naming: Shikon and Shikoku.
People of Falaina - Authorities
Voiced by: Nobunaga Shimazaki (Japanese), Bryce Papenbrook (English), Alan Prieto (Latin-American Spanish)
One of the few non-thymia users of the Mud Whale, and Sami's older brother. He's a(n overly) kind and compassionate man, trying his hardest to find a cure to the Marked people's short lifespan.
- Actual Pacifist: He's truly incapable of hurting others, and would rather talk than fight.
- All for Nothing: He wanted to find a cure to the Marked's short lifespans because he knew he wouldn't be able to bear Sami dying before him. Well, about that. Just to hammer the nail into the coffin, it's eventually revealed that Falaina is responsible for the entire thing, meaning it was a hopeless goal from the very beginning.
- All-Loving Hero: He always has Sympathy for the Devil, even if he was furious at them moments ago or if they betrayed them. In the latter case, in spite of everything, he still offers for Rochalizo to become part of the Mud Whale for good.
- Badass Pacifist: When things get grim as they do after arriving in Amonlogia and being held captive, he shows his inner steel—not through any weapon, but by standing his ground and refusing to cower.
- Beware the Nice Ones: Subverted. When Hakuji dies and Liontari mocks his death, Suou is pissed and, for the first time, picks up a weapon with the intention to fight... but is easily defeated nevertheless.
- Bishōnen: If it wasn't for his voice you would think he's a woman.
- The Chains of Commanding: He does his best, but it is not easy for him to have to command the Marked to fight, especially when many of them inevitably die, which he blames himself for.
- The Charmer: Someone's blocking the way? Just get Suou to smile at them, and you'll get through in no time flat.
- Chick Magnet: He's really popular with the ladies from the council.
- A Child Shall Lead Them: He's only seventeen. His ascension was unexpected, due to Taisha's untimely death.
- Cute Clumsy Girl: A male example. He can trip over nothing, much to Kuchiba's bafflement.
- Distressed Dude: He gets locked up in episode 4 after he refuses to sink the Mud Whale as per the Elders' orders. And then, with the other Unmarked, he's held hostage against the Marked in Amonlogia.
- Dude Looks Like a Lady: The island knows better. People outside the island, on the other hand...
- Hair of Gold, Heart of Gold: Greenish, technically, but combined with him being one of the most purehearted characters (to a fault), he gives off this impression.
- Long-Haired Pretty Boy: Not helping with his effeminate appearance.
- Nice Guy: Incredibly sweet. If anything, he's too nice for the series he lives in.
- The Needs of the Many: After Ouni and Lykos are captured by Orca, he chooses not to go after them and instead tries to find a place where the inhabitants of the Mud Whale can settle. Chakuro is of course upset with this decision.
- Non-Action Guy: No combat skill. Heck, he's terrible at any kind of physical activity in general.
- Not So Above It All: Two words: "Not today!"
- Rage Breaking Point: Played for Laughs. After Chakuro, Nezu, and Ro dump sand on him immediately after his speech, he snaps and yells at him that even he can get mad, but it's an entirely comical moment.
- Screw the Rules, I'm Doing What's Right!: When the Elders order him to sink the Mud Whale into the sand, Suou refuses and is locked in the dungeons for his trouble.
- Stepford Smiler: In the manga, right after he tries to cheer up Kicha, who's grieving over Nibi's death and Ouni's coma, he privately breaks down, with only Kuchiba witnessing it.
- Supporting Leader: As the chieftain of the Mud Whale. He's the one making the decisions and dealing with any political affairs.
- Sympathy for the Devil: Towards Liontari in episode 8. Thanks to Aíma's Magic Music, he taps into Liontari's memories and sees the sad circumstances that led him to become the psychotic killer he is today. After Shuan incapacitates him, Suou offers him a chance to surrender peacefully and live with them in Falaina. Unfortunately, Liontari is too broken to listen to reason.
- Tender Tears: After his sister dies.
- Vitriolic Best Buds: He becomes fast friends with Rochalizo, but their interactions are often in the form of comical bickering.
- Wide-Eyed Idealist: During the first attack, he initially believes that this can be talked over, and that nobody needs to fight. Cue him walking in on Ouni slaughtering the enemy. Even afterwards, he tries to promise Kicha that he won't let there be any more fighting, and suffice to say that he absolutely is not able to keep his word.
- You Are in Command Now: Becomes the mayor of the Mud Whale after Taisha's death.
- You Gotta Have Blue Hair: Has light green hair.
Voiced by: Aya Hisakawa (Japanese), Anne Yatco (English), Jahel Morga (Latin-American Spanish)
- Beauty Mark: Has one under her lip, and another on her forehead—likely meant to invoke an image of elegance.
- Celibate Hero: As Chieftain, she was forbidden from having any family, hence why Kuchiba kept his feelings private.
- Dead Star Walking: Voiced a by a veteran seiyuu, looks initially important and dies two episodes in.
- Oblivious to Love: Shinono notes that Taisha had no idea Kuchiba was madly in love with her.
- Puppet King: More or less serves as one. All the real power lies with the council of elders, with the mayor serving as a figurehead for the people.
- Sacrificial Lamb: She's killed by Empire forces during episode 3.
- Spirit Advisor: To Chakuro after her death, urging him to save the people of the Mud Whale and discover the truth the Elders hid from them.
- Stepford Smiler: Generally acted cheerful around others, but Kuchiba realized that deep inside, she empathized with the Marked's plight to the extent that she herself was an unhappy person.
Voiced by: Kosuke Toriumi (Japanse), Doug Erholtz (English), Marco Guerrero (Latin-American Spanish)
One of the few unmarked of the Mud Whale. In love with Taisha, whom he acts as an attendant to.
- Arranged Marriage: In the past, despite his protests, he was made to marry a Marked girl with an especially short lifespan.
- Distressed Dude: Held captive in Amonlogia with the other Unmarked.
- Fiery Redhead: Red-haired, and one of the more temperamental characters in the series.
- Jerk with a Heart of Gold: Short-tempered and strict, but still very much a good guy.
- Luminescent Blush: When interacting with Taisha.
- Not So Above It All: A non-comedic example. He's usually the strictest regarding the "no crying" rule during sand burials, so when he of all people is crying or expressly permits it, you know that it's a heartbreaking one.
- Older Than They Look: If you were wondering why Masoh keeps calling him an old man, he's thirty-nine, despite being drawn clean-shaven and slender like a younger Bishōnen.
- Outliving One's Offspring: His son is a Marked.
- Parents as People: As with most Unmarked parents. He's shown to care about his son (Kikujin), but their drastically different lifespans complicates their relationship and Chakuro notes that he (and Shinono) hold back around their kids for it.
- Revenge Before Reason: Rasha calls him out on desiring vengeance for Taisha's death. In the battle itself, he admits that she's right... except for the part where she assumed he'd leave it to the Marked. Instead, he goes out on the battlefield himself, despite being an Unmarked. And still badly injured. If it weren't for Masoh's intervention, he'd be dead.
- Sarcastic Devotee: To Suou. Compared to Shinono, Kanae, and Furano, who are much friendlier and more polite, Kuchiba is brutally honest with him and entirely willing to criticize him.
- Situational Hand Switch: In the second attack, he wields a sword in his left hand, due to his right arm having been badly injured during the first attack.
- Survivor Guilt: He wishes he'd been the one to die instead of Taisha, given that he was right there with her when they were attacked.
- Undying Loyalty: To Taisha.
- Vitriolic Best Buds: Constantly butting heads with Masoh ever since they were kids.
Voiced by: Ikumi Hayama (Japanese)
An attendant to the Chieftain.
- Love Hurts: After her first husband—a Marked—passed away, she swore she'd never fall in love with another Marked, as she didn't want to feel that pain again. Of course, she can't help but fall in love with Masoh, who's to die soon and she knows it.
- Obfuscating Stupidity: She knows Masoh is in love with her but purposely plays dumb.
- Oblivious to Love: Subverted. It seems as though she's unaware of Masoh's feelings for her, but she admits to Kuchiba that she's just pretending not to notice.
- Outliving One's Offspring: Her child is a Marked.
- Parents as People: Same deal as Kuchiba (and most of the Unmarked parents).
Voiced by: Eizou Tsuda (Japanese), Keith Silverstein (English)One of the elders.
- Dying Moment of Awesome: Protects a group of kids and takes down the advancing soldiers through sheer determination after he's been cut down, despite having zero combat skill.
- Sole Survivor: Inverted. He's the sole Unmarked to die during the second attack.
- Well-Intentioned Extremist: He decides to sink the Mud Whale (in a failed attempt, thankfully), but because he believes that otherwise, they're doomed to be slaughtered by the Empire, in which case it's better to Face Death with Dignity. By the time he's killed, he admits to Suou on his deathbed that he regrets that decision.
Voiced by: Motomu Kiyokawa (Japanese), Kyle McCarley (English)One of the elders—the oldest resident on the island, in fact—as well as one of the first leaders of the Mud Whale.
- Only Friend: To Miden.
Voiced by: Mari Yokoo (Japanese)One of the elders, and Shuan's mother.
- Like Father, Like Son: She's an aloof and not entirely pleasant person who digs into people's psyche through words. Gee, who else on the island is like this?
- Outliving One's Offspring: She's an Unmarked, Shuan's a Marked. Do the math. Shuan actually suspects that this is why she tried to turn him into a Daimonas, as doing so would extend his life.
People of Falaina - Past Figures
DuoThe first leader of the Mud Whale.
- Driven to Suicide: Throws herself off a cliff to be Together in Death with Ekato when it becomes clear that it's over for her.
- Posthumous Character: Died long before the start of the series.
- Start of Darkness: Finding out that her lover was a spy and therefore having to (have Miden) kill him was the beginning of the end for her.
MidenA boy of mysterious origins who saw Duo as his "mother".
- Artificial Human: As a Daimonas, and therefore a being born from the Nous/created through Duo's efforts.
- Identical Stranger: Looks identical to Ouni.
- Long-Haired Pretty Boy: He looked exactly as Ouni does, so.
- One-Man Army: Easily capable of taking out multiple people in an instant. He died only because he let himself be killed.
- Posthumous Character: Lived several generations ago.
- Psychopathic Manchild: An extremely dangerous being who, in some ways, was still a child unable to grow up.
- Tragic Hero: Or Tragic Villain, depending on exactly how you see him. He genuinely wanted to protect the island, but between his devotion to Duo and the Blue-and-Orange Morality that being a Daimonas with a restricted upbringing gave him, he ended up as a killing machine turned against the very people he was supposed to help, and was ultimately killed by them and his Only Friend, Byakuroku.
The Allied Empire
- Apocalypse How: They believe that the gods once destroyed the world in an event called the Karthartirio Rain because humanity could not control their emotions.
- Emotion Suppression: They use the Nous to keep their emotions in check.
- Emotions vs. Stoicism: They are on the Stoicism side.
- The Empire: Referred to as such by Lykos herself.
- Hypocrite: A conversation in episode 12 reveals the members of the upper castes sometimes eat the flesh of Nous, called sarka, to limit the amount of emotions consumed. However, it's only supposed to be given to relatives up to the third degree.
- The Stoic: The Empire rejects emotion, as they believe it to be the root of all evil.
- Not So Stoic: However, many of the characters from the Empire are shown to be rather expressive.
Voiced by: Daiki Yamashita (Japanese), Griffin Burns (English), Emilio Treviño (Latin-American Spanish)
An imperial apátheia soldier who experiences emotions, namely glee in killing. He's considered a freak even in his country for that reason.
- Animal Theme Naming: "Liontari" is the Greek word for lion.
- Blood Knight: He takes joy in slaughtering people. That's one reason he can't become a proper soldier, as he's incompatible with Nous and is unpredictable as a result. It doesn't help that he lives in a society where emotions are considered evil and barbaric, and thus has no one to teach him how to manage them.
- Bungled Suicide: Jumped out of a window as a child, supposedly to get away from the words of the other children.
- Child Soldier: He's fifteen and an active soldier for the Empire.
- Faux Affably Evil: His cheerfulness while killing innocents only makes him more disturbing.
- Fictional Disability: If it weren't for him being born in the Empire, his incompatibility with the Nous wouldn't have been that much of a problem. Here, it causes him to be ostracised.
- Hellish Pupils: Another details that makes him look pretty creepy.
- Large Ham: He can't contain his joy to meet people with emotions, and it shows. His voice actor in the anime chews the scenery into smithereens.
- Loners Are Freaks: His personality is practically stated to be a result of his ostracisation from everyone, including his own family.
- Not Quite Dead: He's stabbed in the throat and stomach, hit by arrows, and falls off the Mud Whale into the sea of sand, but survives because Aíma rescues him.
- Spell My Name with an "S": The French edition calls him "Leodari", based on the Japanese spelling "Ryodari".
- You Gotta Have Blue Hair: Pink hair in his case.
Voiced by: Akira Ishida (Japanese), Kyle McCarley (English), Gabriel Basurto (Latin-American Spanish)
Lykos' older brother, and a general in the Empire's army.
- Affably Evil: His attitude tends to blur the line between this and Faux Affably Evil, but it's noteworthy that when Suou and co. infiltrate his ship to negotiate, Orca waits for them in an area where thymia cannot be used—more of a disadvantage to him than them—and throws away all his weapons to fully level the playing field, as he sincerely believes he can win them over to his side.
- Aloof Big Brother: First, he had no qualms abandoning his little sister Lykos, and when he found out she was still alive, he decided to use her a guinea pig to see how Falaina will affect her. Since he's devoid of emotion, like all the imperial soldiers, this cold-heartedness is hardly surprising.
- Animal Theme Naming: His name is Orca, which means, well, orca.
- Arch-Nemesis: To Ouni. Once the latter realizes he's in the presence of the one who ordered the attack on Falaina—the attack that killed his friends—he flips. Meanwhile, on Orca's end, he very much wants Ouni in his possession.
- An Arm and a Leg: Ouni decimates one of his lower legs.
- Artificial Limbs: He obtains one after losing his leg and notes that it's almost better than a real limb, as he can manipulate it with thymia.
- Dark-Skinned Blond: Both in the manga and anime.
- Dissonant Serenity: He rarely breaks away from his normal expression of a slight smile, even when logically he should be reacting due to things like pain.
- Fingore: In the fifth volume, the ends of two of his fingers are blown off by a gun. Not that it seems to affect him any...
- Good Scars, Evil Scars: He has a particularly distinctive scar across his face.
- Large Ham: Becomes this during his trial for losing Skylos. It's what helps him get out of a death sentence.
- Long-Haired Pretty Boy: He has a Hime Cut, and ultimately, his scar doesn't take away from his good looks.
- Manipulative Bastard: Lykos notes that he's good at weaving stories to make himself look better. He proves this when he goes from being sentenced to execution to a free man who waltzes right back to his plans and even manages to snag the Empire's best ship, all through talking. He also plays on Ouni's insecurities to weaken him, though Ouni does try to resist, at least.
- One-Man Army: He's considered to be worth as much as a nous, which is also why the Empire can't afford to get rid of him.
- Red Baron: God of Death.
- The Starscream: Wants to take over the empire, and the very first Nous, Anthropos, that's in possession of the Empire.
- The Unfettered: Despite being a higher ranked member of the military, Orca doesn't care for following the traditions of the Empire and will do what he feels is necessary to achieve his goals. This includes allowing combat in the room that holds the Nous on Skylos (something considered forbidden by his people) and giving his archivist Itia sarka, which is only given to family members of the upper caste. He retroactively justifies the latter by arranging a marriage with her.
- Used to Be a Sweet Kid: Heavily implied through flashbacks. Lykos has a memory where he was giving her a piggy back ride to the military academy she was going to, while Itia has a flashback of him crying and begging the Nous (presumably) to take more of his emotions away because he doesn't want to kill people.
- Well-Intentioned Extremist: Everything he does is to create a world where humanity can stand equal to the nouses and justifies his atrocities with the fact that if he succeeds, then the (surviving) victims can simply jump to a timeline where they never happened, ensuring a blissful life. In other words, Utopia Justifies the Means.
- White Hair, Black Heart: He has white hair and is one of the primary villains.
Voiced by: Lynn (Japanese)
An archivist initially assigned to Skylos and later Orca's fiancee − he's the one who gives her this name.
- Ambiguous Situation: Her relationship with Orca. The latter clearly has interest in her, but is it one of genuine affection or does he mean to use her? And when she's regaining her emotions, does she actually care about him to some degree, or is it merely respect due to their differing ranks? In Itia's case, it seems to be the former so far.
- Ascended Extra: She first appears as a mere nameless archivist for the Skylos, but gradually gains prominence as Orca's plans progress. This is reinforced when he takes her as his fiancée and gives her a name, something normally reserved to high rank apatheias.
- Brutal Honesty: She doesn't hold back on her opinion, which Orca appreciates.
- Cute Bookworm: Is shaping up to be this as her emotions return.
- Floral Theme Naming: She is named after the Greek word for willow.
- Kissing Discretion Shot: Shares one with Orca in episode 12.
- Not So Stoic: She appears to be just like other members of the Empire, but Orca has been feeding her sarka, and thus she has been slowly regaining her emotions.
- Parental Substitute: After Liontari becomes one of Orca's "jesters" and as Itia herself slowly regains emotions, she becomes the closest thing he probably ever had to a mother, although it remains subdued, obviously.
- Sole Survivor: She was from a small independent land that the Empire razed to the ground, leaving her as the only survivor.
- Token Good Teammate: Between her, Orca, and Liontari? No contest.
- Unholy Matrimony: Is due to have one with Orca.
Voiced by: Daisuke Hirakawa (Japanese)
Commander of Skylos.
- Animal Theme Naming: His name means "spider" in Greek.
- Asshole Victim: While getting scapegoated by Orca as the reason why the Falaina Extermination Plan failed was a pretty mean fate, the fact that he intended to kill Lykos despite having orders not to (much to the unease of even his subordinates), was implied to be a Bad Boss, and killed Nibi means he kind of had it coming.
United Kingdom of Siderasia
Rochalízo Anastegamos Neie Imiskin Emarika Antipatros of Amonlogia
Voiced by KENN
The fourth son of the Duke of Amonlogia who appears in volume 5 to "colonize" the Mud Whale with his small group of followers. He eventually cultivates friendly relationships (sort of) with its people.
- Big Ego, Hidden Depths: Behind his massive ego is a deeply insecure and abused child who's desperate to earn his father's love, even if it means betraying his friends.
- Glory Seeker: He set out to find new islands and/or resources. Even after boarding the Mud Whale, he demands detours for when he thinks he might be onto a discovery.
- Green-Eyed Monster: To an extent, he resents Suou for being everything Rochalizo isn't: someone who's needed and beloved by his people, compared to Rochalizo who has spent his life struggling against his reputation as the "useless" son.
- HeelFace Revolving Door: Starts off as a short-lived antagonist, before becoming something of an ally. Then, it's revealed he was Evil All Along... but the guilt tears him apart, and it's after Dumpling confesses to helping the people of the Mud Whale that Rochalizo realizes he should've sided with them from the start.
- I Choose to Stay: Temporarily, anyway. When the Mud Whale is ready to part ways from Amonlogia, Rochalizo makes the last-minute decision to join them on their journey, citing that he wants to see where they settle.
- Ineffectual Sympathetic Villain: His claim over Falaina quickly appears more comical than threatening, as everyone can see he's not a bad guy at heart. Even his followers.
- Jerk with a Heart of Gold: Self-centered, haughty, and rude. Also, very prone to Pet the Dog.
- Mismatched Eyes: His left eye is red and his right eye is yellow, as seen on the cover of the ninth volume.
- An Offer You Can't Refuse: In Ch. 22, to Chakuro and Lykos, whom he needs to move the boat: take him or die (later turned "take him or he'll spill the secret he's keeping for their sake").
- Overly Long Name: The only named character who has more than Only One Name in fact. He's Rochalizo Anastegamos Neie Imiskin Emarika Antipatros of Amonlogia. Suoh manages to repeat it perfectly, to everyone's shock.
- Secret Keeper: Thanks to Lykos, he's among those who know why the Marked have short lives, but promises to keep it a secret (though he's not above using it to blackmail...).
- The Unfavorite: He's not exactly well regarded within his family, hence why he wants to conquer Falaina and bring it back to his country as a trophy.
- Vitriolic Best Buds: Simply put: Gamba weeps in joy over Rochalizo having finally made a friend while watching him bicker with Suou over Rochalizo's map.
- Was It All a Lie?: When he betrays the Mud Whale. He desperately tries to convince himself that it was; Suou isn't convinced. Guess who ends up being right?
- "Well Done, Son!" Guy: He wants nothing more than his father's approval.
- You Gotta Have Blue Hair: Yellowish green hair with blue and orange stripes. Quite a work of art, which fits with his flashy and comically haughty attitude.
Gamba: Voiced by
Chasmourito: Voiced by
Foni: Voiced by
Fterna: Voiced by
Donti: Voiced by
Rochalizo's subordinates—Gamba and his grandson Chasmourito, the sisters Fonia and Fterna, the mechanic Donti, and unnamed soldiers—who accompanied him on his journey and, likewise, form ties with the people of the Mud Whale.
- Action Girl: Foni and Fterna, who act as the group's brawn.
- Badass Normal: Fterna is able to fight head-to-head against thymia users using nothing but physical might.
- Boobs of Steel: Fterna has the largest bust in the series, as Tonoko appreciately notes, and is one of the strongest fighters around.
- Childhood Friends: Chasmourito's mother was Rochalizo's wet nurse, making them brothers of a sort.
- Cool Old Guy: Gamba, the oldest among Rochalizo's subordinates and yet nothing but kind and friendly to the Mud Whale, and calls out Duke Dachtyla for his treatment of them.
- Laser-Guided Karma: The only subordinates in on Rochalizo's plan are unceremoniously killed by Ouni, while those who were unaware and immediately try to help the Mud Whale when they realize survive.
- Locked Out of the Loop: Most of them had no idea that Rochalizo planned to betray the Mud Whale.
- Love at First Sight: Fterna, with Shuan—complete with her own (completely false) delusions about what he's like. According to Foni, this happens frequently.
- Older Than They Look: Chasmourito looks like a little kid, shocking Chakuro and co. when they realize that he's Rochalizo's age and therefore older than them.
- Samus Is a Girl: Due to all the headgear she wears, it's difficult to tell—both in-universe and out—that Donti is a girl.
The Duke of Amonlogia, and Rochalizo's father.
- Abusive Parents: He's the reason for Rochalizo's issues, and he outright strikes him for his failures. With that said, while he's always been strict with Rochalizo, it's implied that his behaviour in the present is uncharacteristically harsh.
- HeelFace Turn: Ultimately, he has a change of heart and lets the Mud Whale go.
- Necessarily Evil: Despite being aware that he's Not Himself, he continues on because it doesn't change the fact that his land is slowly dying and subjugating the Mud Whale can help save it.
- Not Himself: In sharp contrast to his treatment of the people of the Mud Whale, he's apparently someone who usually friendly to strangers and welcomes them with open arms. Dachtyla himself is aware of this and blames the Mud Whale for messing with his head.
Dachtyla's second son and Rochalizo's older brother.
- Big Brother Bully: Like all of Rochalizo's siblings, he's fairly dismissive of Rochalizo. However, he's also the only one of them to explicitly reconcile with him by the end of the arc.
- Fearless Fool: Much to his subordinates' dismay, he's suicidally overconfident and attacks (what he believes to be) the Empire's ships on sight. Rochalizo notes he's always been like this.
- Jerk with a Heart of Gold: Vain and self-centered, but he's also the sort of person who personally carries injured subordinates to safety and is the only one of his brothers to express unease over his father's treatment of the Mud Whale.
- Love at First Sight: With Suou. He keeps forgetting from thereon that Suou's a man, not a woman.
- Punch-Clock Villain: He's just following his father's orders, even if he doesn't like it, and doesn't do anything particularly hostile.
An envoy from Amonlogia.
- Astonishingly Appropriate Appearance: Ginshu calls him "Uncle Dumpling" because of his round appearance... only to surprise everyone involved because that's his actual name.
- Ineffectual Sympathetic Villain: He threatens to report the Mud Whale's covert activities to Duke Dachtyla, but this is only after he spilled useful information to them and belatedly realized he shouldn't have, and he continues helping them anyway until he gives up and accepts he's on their side.
- What Could Have Been: In-Universe, he thinks about how if Amonlogia had accepted the people of the Mud Whale like they wanted, they could've become great friends to Amonlogia.
Strange aquatic-looking beings that live below each island.
- Eldritch Abomination: Their forms are absolutely bizarre to look at.
- Emotion Eater: All of them except Falaina are this.
- Monster Is a Mommy: In the case of the twins Neri and Aima, Falaina is said to be their mother. It isn't currently known if other Nous can have "children" too.
- Physical God: The Nous are believed by the Empire to be the "bodies" of the gods themselves.
- Power at a Price: The Nous grant humans thymia in exchange for their emotions. In the case of Falaina, however, it consumes the life force of thymia users.
- Taking You with Me: An unintentional example. When Nous are killed, the island they're attached to sinks, also dragging down those who don't escape in time.
- Vampiric Draining: Falaina is unusual in that it consumes the life force of the thymia users as its nourishment. Whether or not there are other Nous that do this, or just don't consume emotions isn't clear.
A cute, catlike creature that is found with Lykos on Skyros.