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Kaiju
Numbered Kaijus
Kaiju No. 1
The first Numbered Kaiju that is also the first Numbered Weapon.
- Combat Clairvoyance: Was reputed to have precognition though it is more like True Eyes that can read the electronic signals of the brain and nervous system. It only really had this after it became Gen Narumi's Numbered Weapon.
- Extra Eyes: Had multiple eyes over its body. This also applies to its weaponized form.
- Posthumous Character: Long since dead before the beginning and turned into a Numbered Weapon.
Kaiju No. 4
An already defeated Kaiju. Its remains were used to create the suit that used by Kikoru's mother and later herself.
- Extra Eyes: Had three eyes.
- Flight: Has had this ability when alive and as a Numbered Weapon, it gives the compatible wearer this ability and is the only Numbered Weapon that has this capability.
- Giant Flyer: Was originally one when it was alive.
- Posthumous Character: Long since dead before the beginning and turned into a Numbered Weapon.
Kaiju No. 9
- Ancient Evil: In chapter 104, showing how long it had existed, it shifts through some of its previous humans it absorbed which includes an armored samurai and an onmyoji priest.
- Big Bad: A dangerous, recurring foe with a sinister agenda.
- Body Horror: Its main attack consist in deforming his own fingers to fire chunks of his flesh at his opponents.
- Diabolus ex Machina: It shows up in what's supposed to be a training exercise after it's over to revive the dead kaiju and give them a significant power boost. Later, it does the same thing when the Fungus Kaiju is being dealt with. However, there are only so many it can resurrect at a time, and it's tiring for it.
- Eyeless Face: Played with. At first, it appears to be eyeless, but it has eyes below the bone ridges of its face. The eyes are often not drawn, even at angles where they should be visible, to reinforce its creepy appearance. When they are drawn, it's almost exclusively when it's threatening someone.
- Hand Blast: Its main attack is a combination between this and Finger Gun, mutating its fingers and causing them to burst and shoot at targets. Its transformative abilities mean it isn't limited to just its two hands either.
- The Heavy: Monster #9 serves as the most persistent antagonist throughout the series, starting from the recruits' second preliminary training. Even though No. 8 manages to defeat it, it manages to escape. Its ability to disguise itself as humans and fuse with other beings to absorb their powers make it one of the greatest threats against humanity.
- Hero Killer: He absorbed Isao Shinomiya, effectively killing him and gained Kaiju No. 2's tremendous power in the process.
- Human Disguise: It can shift between kaiju and human form, and can Kill and Replace people to take a new identity.
- It Can Think: It's the first kaiju in the series shown to be capable of coherent speech, with the exception of Kafka and the Mysterious Larva kaiju that entered him. That's because it's also a human/Kaiju hybrid of some kind, though it doesn't identify as human.
- Know When to Fold Them: Savvy enough to know when it's best to retreat with what you've got and manages to do so quite often, even when opponents like Kafka try to stop him.
- Lean and Mean: Unlike Kafka's Kaiju form, it's thin and gaunt to show his villainous nature.
- Manipulative Bastard: He created a Kaiju Expy of Kikoru with the exact same "daddy issues" for the sole purpose of having an assassin specially trained to kill Kikoru. Said Expy, Kaiju No. 15, views No. 9 as her father and desperately seeks his approval just like Kikoru wanted her own father's approval... But while Isao truly and deeply loved his daughter, No.9 only ever saw No.15 as a pawn. As a result, Kikoru eventually manages to overpower and defeat No.15, leaving the dying Kaiju to acknowledge how different their respective "fathers" truly are.
- The Medic: Is capable of reviving deceased Kaiju. As No. 10 reveals, he can also make Kaiju as well.
- Multi-Armed and Dangerous: It can create multiples arms using its powers to shoot at its targets faster.
- One-Winged Angel: When Reno starts putting genuine pressure on it, it bulks up and grows two extra arms. And when Kafka shows up, it grows even more arms than that.
- Red Right Hand: The eyes of its Human Disguise look... Off, clearly hinting that there is something wrong about it.
- Villain Forgot to Level Grind: Zig-zagged. While No. 9 had bulked up in preparation for his rematch with No. 8, he largely just added extra mass. Kafka had developed better control over his powers and was able to take him down in two hits, one for each core... except it, and the one Narumi takes out, were clones the real No. 9 made as a diversion, with his real body heading to the base and absorbing Isao Shinomiya, taking Kaiju No. 2's powers in the process. His plans were set up so that he'd get a numbered Kaiju's power no matter what.
- You Are Number 6: Standard to all Kaiju that evade or survive the first attempt to kill them. Counts as Red Baron as well, since the numeric designation means they are most likely very dangerous.
- Villain Teleportation: It dissipates into smoke and vanishes as mysteriously as it arrives. However, doing this takes a second or two, and hurting it before it can finish interrupts this process.
Kaiju No. 10
A humanoid kaiju that leads a flock of wyvern kaiju.
- Blood Knight: He attacked Tachikawa Base to fight the strongest person there. It's such a strong urge that he's willing to be weaponized so he can keep fighting.
- Extra Eyes: He can make more eyes appear on his body as he demonstrated in his giant form.
- Hunter of His Own Kind: All numbered weapons technically qualify, being made from the remains of mighty Kaiju to allow their user to wield said Kaiju's powers and use them against other monsters. However, Number 10 in particular stands out because he's still alive and conscious as a Weapon, and loves fighting so much that he's actually perfectly fine siding with the Defence Force if it means he'll have no shortage of powerful foes to fight.
- Living Weapon: As a weapon, he is an Empathic Talking Powered Bio-Armor with a Prehensile Tail.
- Losing Your Head: His head gets separated from his body after getting his upper body blasted by Mina.
- More Teeth than the Osmond Family: His mouth has two layers of teeth, one of multiple but humanoid teeth, and an outer layer of fangs where his lips would be. The cross where his eyes should be is yet another mouth with smaller, but still sharp, fangs.
- "Not So Different" Remark: He tells Hoshina that they resemble each others since they both enjoyed their fight together to convince him to weaponize No. 10 and use it as his weapon. And he's later proved to be absolutely right, when the realization of how similar he and 10 are allows Hoshina to unleash his Weapon's full power.
- One-Winged Angel: After receiving enough damage from the vice-captain, he turns into a giant monster much more powerful than his human-sized version.
- Taking You with Me: Tries this when he ends up losing, his last roar being to get all the Wyvern Yonju to merge together for a suicide bomb. It fails, thanks to Kafka intervening.
- Teeth-Clenched Teamwork: With Hoshina after becoming his weapon. No. 10 is such a Blood Knight that it initially can't synchronize with its more strategic partner. Even once they do start working together, they still keep bickering as they mow down their enemies. Then, from Chapter 90 and onwards, Hoshina realizes that he and No. 10 are no different, No. 10's Blood Knight personality resonating with the fact that Hoshina genuinely loves using his blades. This sheer realization not only removes the whole Teeth-Clenched Teamwork aspect of their dynamic entirely, it also allows them to synchronize to the point that Hoshina can now use his suit's power with 100% efficiency.
- You Are Number 6: Is given the designation of #10 after the base attack.
Kaiju No. 11
A Kaiju created to fight Gen Narumi.
- Making a Splash: Has hydrokinetic powers to counter Gen Narumi who uses Numbers Weapon 1 which can read electricity to predict a living thing's movement, since the moving water has no electricity flowing within.
- You Are Number 6: Is given the designation of #11 as part of the group of five Kaiju that split up the Kaiju Defense Force combatants.
Kaiju No. 12
- Upgrade vs. Prototype Fight: It is an upgraded #10 and is the Kaiju fighting Soshiro Hoshina wearing Numbers Weapon 10.
- You Are Number 6: Is given the designation of #12 as part of the group of five Kaiju that split up the Kaiju Defense Force combatants.
Kaiju No. 13
- I Know Madden Kombat: Its fighting style is based on athletism, complete with using a crouching start to get to his opponents as fast as possible.
- You Are Number 6: Is given the designation of #13 as part of the group of five Kaiju that split up the Kaiju Defense Force combatants.
Kaiju No. 14
Kaiju no. 14
- Multiple Head Case: Has four faces.
- The Pawn: Turns out, it's not necessarily there to defeat Mina... it's there to teleport Monster No. 9 to her location after she defeats it.
- Power Floats. Floats in the air with no discernable method of propulsion.
- Teleportation: Has this power to quickly move.
- The Monolith: Has the appearance of a huge black slab with four faces.
- You Are Number 6: Is given the designation of #14 as part of the group of five Kaiju that split up the Kaiju Defense Force combatants.
Kaiju No. 15
Kikoru form
True form
A female humanoid Kaiju.
- Brain Monster: Her base Kaiju form has the top of her head have multiple disproportionate large brains arranged to look like a hairdo with Girlish Pigtails and clusters of smaller brains that make Clothing Appendages of a necklace and skirt. It is a Meaningful Appearance since she has Psychic Powers.
- Differently Dressed Duplicates: She can take the form of a black haired Kikoru Doppelgänger in a black Sailor Fuku. It's notable that she was doing this as she developed, taking on the appearance of a child Kikoru when she was physically smaller.
- Psychic Powers: She can use mental powers to be a Master of Illusion. She uses it to Mind Rape Kikoru.
- Tragic Monster: She doesn't just look like Kikoru; she's also very similar in terms or personality, more specifically, how desperate she is for the affection and approval of her "father" (Number 9). Although, unlike Isao Shinomiya (who was cold and distant towards Kikoru but deeply loved her nonetheless), Number 9 doesn't care at all about 15 unless she can do what he created her for (killing Kikoru). We only find out about this through a flashback in her dying moments, and it adds a tragic layer to her death as she points out herself that Kikoru's father was hard on her because he loved her, whereas Number 9 only ever saw Number 15 as a pawn. While the atrocities committed by 15 prevent Kikoru from feeling affection towards her despite their similarities, she does promise to punch Number 9 square in the face on her behalf.
- "Well Done, Son" Guy: Or gal, in this case. As with Tragic Monster, she desperately wants number 9 to love her, and he dangles that to get her more motivated to kill Kikuru.
- You Are Number 6: Is given the designation of #15 as part of the group of five Kaiju that split up the Kaiju Defense Force combatants.
Other Kaijus
Philinosoma
A Honju that appeared and was quickly dispatched at the beginning of the series.
Mysterious Larva
The Kaiju responsible for giving Kafka his powers. It is not much larger than a normal bird. It has the ability to speak, declaring "I found you!" after finding Kafka in the hospital. It entered his body and fused with him to turn him into a sort of Kaiju human hybrid.
- Ambiguously Evil: Well, it is a Kaiju (or at the very least related to Kaijus), and every single Kaiju seen so far, with the exception of Number 8, was either malevolent or a mindless force of nature. Yet, the Larva doesn't seem to want to cause wanton destruction and actively fights against his own kind using Kafka as a vessel, while still leaving him in complete control. Except during the fight against Isao Shinomiya, but even then, the Larva wasn't interested in harming Shinomiya himself, but rather the Kaiju from which Shinomiya's weapon was made.
- Hunter of His Own Kind: This creature actually wants to kill other Kaiju for some reason. This proves to be a huge problem when it mistakenly identifies Isao Shinomiya's weapon as the Kaiju it was created from, causing the Larva to fully control Kafka in order to fight back with killing intent. Thankfully, Kafka manages to regain control before Shinomiya gets truly harmed.
- Mysterious Past: Virtually *nothing* is known about it. Where does it come from? Why did it seek Kafka out in particular? Why does it want to kill other Kaiju? Why is it able to talk? Why did it Freak Out and go ballistic when it sensed Kaiju No. 2's presence within Shinomiya? Nobody knows, not even Kafka himself.
- Orifice Invasion: How it fused with Kafka.
- Symbiotic Possession: Played with, as Kafka has control over his body. Until he encounters weapons made from Kaiju No. 2.
- Unstoppable Rage: It goes berserk upon seeing weapons made from Kaiju No. 2. In fact, it appears that the Larva didn't realize they were merely weapons made from a Kaiju corpse and wielded by a human, and it's implied it reacted the way it did because it genuinely believed that it was up against Kaiju No.2 itself in a life-or-death situation.
Test Kaiju
A kaiju that the recruits must battle for entrance into the defense force.
- Game-Breaking Injury: Deliberately induced. When it was captured it was maimed to remove its combative uni-organ and reduce its combat power.
- Super-Hearing: To compensate for its lack of eyes, which also makes it exceedingly vulnerable to sound-based weaponry.
Fungus Kaiju
The first Kaiju fought by the new recruits of the Kaiju Defense Force, a titanic mass of floating mushrooms and fungi.
- Explosive Breeder: Not only does it produce a lot of after beasts, but the after beasts also have reproductive organs of their own. Luckily, Kafka notices this and passes the info to the team before it ever becomes a problem, much to Kaiju No. 9's consternation.
- Kaiju: All the kaiju qualify, but it's of note for being large enough to step over a city block full of skyscrapers without brushing a single one.
- The Unfought: By the new recruits, at least. Mina handles it on her own.
Wyvern Kaiju
Flying kaiju who (normally) operate alone.
- Action Bomb: The humanoid leader can control them to do this.
- Breath Weapon: They have this for a ranged attack.
- Giant Flyer: They are large flying kaiju.
- Out-of-Character Alert: The fact that multiple of them working together when they normally appear solo clued in that there is a greater Kaiju commanding their assault.
Ant Kaiju
Giant Ant Kaiju. No. 9 controlled them in his tried attack.
- Ant Assault:
- Beneath the Earth: They usually reside there and rarely go to the surface.
