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A creature created by the Doctor, using relics of an ancient civilization, to help in the fight against the goblins. Though he may appear small and harmless, he can absorb other relics to grow in both size and power.
- Attack Reflector: In the sequel, he gains the ability to spawn a shield that allows him to do this.
- Badass Baritone In his larger form(s).
- Body to Jewel / Gemstone Assault: Knack's unlockable relic forms (Vampire (Ruby), Brittle (Aquamarine), Dark (Amethyst), Massive (Emerald), Sunstone, and Diamond), as well as his Stealth form (clear crystal)
- Brains and Brawn: The brawn to Vargas' brains.
- Cute Machines: In his default form (though, strictly speaking, he isn't a machine). Robo-Knack fully counts, though.
- Dance Party Ending: Knack dances around to How You Like Me Now? by The Heavy during the end credits.
- Deadpan Snarker: Can be quite the smartass.(Evil Orb turns red)"Hmm, is red bad?"(Evil Orb shoots laser, he dodges)"Oh, yeah, red's bad!"
- Dumb Muscle: Massive Knack has enhanced offensive and defensive power, but can only charge one battery of sunstone energy.
- Elemental Powers: As well as relics, Knack can integrate other materials in order to grow, and they're no different in how they increase his offence and defence, though they do imbue him with other properties which affect him in various ways.
- An Ice Person: Ice Knack, particles are dirt-cheap but gradually melt when exposed to heat
- Extra-ore-dinary: Metal Knack, very powerful but highly magnetic
- Green Thumb: Wooden Knack, can be set alight
- Playing with Fire: Wooden Knack when set alight, body gradually burns away but attacks are more powerful
- The Power of the Sun: Sunstone Knack, with more powerful special attacks.
- Glass Cannon: Playing as Brittle Knack will give him maximum strength, at the cost of taking away most of his defence.
- Golden Super Mode: Diamond Knack, which has maximum strength, defense, and Sunstone power.
- There's also Sunstone Knack, who actually is golden and has more powerful Sunstone attacks, but doesn't have the strength and defense that Diamond Knack has.
- Golem: Not quite, but that's how he's described by Morgack.
- Humongous Mecha: In his largest form (but again, strictly speaking, he isn't a mech).
- Life Drain: Playing as Vampire Knack will cause his health to constantly decrease, but increases his strength and causes enemies to drop relics. Also happens when Katrina throws some poisoned relics into him.
- Limit Break: Once Knack accumulates enough sunstones, he can initiate destructive special attacks.
- Homing Projectile: Knack can use the relics from his body to fire at every anemy on screen. It is the only ranged attack he has in the first game.
- Shockwave Stomp: Knack slams his arms down to create a shockwave that disintergrates anything in its blast radius.
- Tornado Move: Knack forms a tornado on himself that shreds anything around him as he walks around.
- Not Quite Dead: Happens to him thrice. Once after getting shot by one of Viktor's robots but manages to pull himself back together. The second time when Gundahar stabs his orb, causing him to fall apart, but reassemble after about 20 seconds. Happens again when some guards blast him with rockets while in stealth mode, causing Vargas and Lucas to think he's gone, but he simply pulls himself together again behind them, leaving behind the stealth pieces.
- Pint-Sized Powerhouse: When he's small, he can still beat up creatures more than twice his size.
- Power Crystal: Sunstones, whose energy Knack can absorb to unleash special attacks.
- Rapid-Fire Fisticuffs: One of the abilities he gains in the sequel. He can even use it on his co-op partner to create a machine-gun spray of relics that hurts enemies.
- Red-Headed Hero: Though it isn't really hair, he has red relics atop his head that are meant to resemble hair. As he gets bigger, he gains more and more red hair-like relics until it looks like he's covered in red fur.
- Rock Monster: Not strictly speaking, but he's somewhat similar to one.
- Robot Me: Robo-Knack, the second-player-controlled character in co-op mode. The sequel appears to have him Put on a Bus in favor of a second Knack with blue hair.
- Stone Wall: Playing as Dark Knack will give him a great increase in defence, but his sunstone batteries don't fill as quickly.
- The Voiceless: In his smallest form.
The Doctor is a successful inventor – his creations include anything from hovercars and airplanes to his masterpiece, Knack. The Doctor’s intelligence is matched only by his inability to think things through, which frequently results in trouble for himself and others.
- Absent-Minded Professor: He's too obsessed with finding out what benefits could come from unearthing the giant relics to listen to Lucas' warnings that bad things could happen.
- It's All About Me: And it's made abundantly clear that once he decides something, he doesn't give a crap about the others' opinion. He eventually grows out of it.
- Brains and Brawn: The brains to Knack's brawn.
- Everyone Calls Him "Barkeep": He's Doctor Vargas, though nobody ever calls him Vargas. He's just simply Doctor.
- Gadgeteer Genius
- Name's the Same: With a minor antagonist of Final Fantasy VI and one of Threat Matrix 's protagonists.
- Parental Substitute: To Lucas, because of Ryder's life as an explorer.
- The Power of Love: After Charlotte forgives him and calls for his help, Vargas gets one hell of a boost in physical strength. He's able to climb up a rope incredibly quickly while he was shown before to have huge difficulties to, and later even knocks out two Goblin guards without the aid of Knack.
- Science Hero
Lucas is the Doctor's 15 year-old assistant and Ryder's nephew. He lost his parents at a very early age, and since then the Doctor has been looking after him. Lucas is smart, competent and hardworking – and is completely failing to get any respect from the Doctor.
- Conveniently an Orphan
- Dude, Where's My Respect?: Though Vargas finally listens to him when he says that opening the door would cause the apocalypse, and even presents Lucas with an award at the end of the game.
- Go Through Me: Lucas does this to prevent Knack from taking the key and giving it to Vargas.
- Grappling-Hook Pistol
- Hypercompetent Sidekick
- What the Hell, Hero?: Towards the end, Lucas finally snaps and chews out Vargas for the latter's Absent-Minded Professor/It's All About Me behaviour.
Ryder is Lucas’s uncle and is an explorer of sorts, there are few places he hasn’t been in his long treks through the wilderness. Ryder is strong, brave, and also not so good with the ladies, having spent perhaps a bit too much time alone.
- Adventurer Archaeologist
- The Casanova: Subverted; you'd expect him to have to beat the chicks off with a stick, given his rugged and manly good looks, but...
- He-Man Woman Hater: He seems distrustful of women, especially Katrina. Subverted because it's implied that they've hooked up at the end.
- Cool Uncle
- Heroic Sacrifice: Dies in the temple beneath Obelisk Mountain trying to save Katrina from falling into lava. Then subverted when the ending reveals that he (and Katrina) survived.
- Walking the Earth
Viktor is a billionaire industrialist who made his fortune through security robots and other more military devices. He is also the hereditary head of an old family – complete with castle in the country – and is therefore rather formal in speech and dress.
- Aristocrats Are Evil
- Bigger Bad
- Blue Blood
- Cool Airship: Has one, and boy howdy isn't it huge.
- Corrupt Corporate Executive
- Even Evil Has Loved Ones: He is devastated when he sees Katrina falling into the volcano, although he doesn't know she survives. He is clearly furious about it when Vargas & co meets him onboard his airship.
- Evil Brit
- Killed Off for Real: After finally opening the door, the orb in the center immediately obliterates him with a laser.
- Obviously Evil: Even the trailers didn't hide it.
- His method of getting Doctor Vargas and Knack to come to his mansion is to kidnap Lucas. Instead of just, you know, asking.
- Purple Is Powerful: His outfit.
- Wicked Cultured
Katrina is the head of Viktor’s security forces, and dedicated to a fault. Katrina is extremely well mannered, which combined with her beauty, brains and athleticism makes for a devastating package – at least as far as Ryder is concerned.
- Ambiguously Brown
- The Baroness
- Dark Action Girl
- Defrosting the Ice Queen: Ryder seems to have gotten through to her after saving her life, as implied by them hooking up. Funnily enough, he actually does call her an Ice Queen earlier in the game.
- The Dragon
- Graceful Ladies Like Purple. Wears purple like her boss.
- Heel–Face Turn: Maybe. She is implied to have hooked up with Ryder, one of the heroes.
- Humongous Mecha: She gets one of her own to fight Knack with.
- Hypercompetent Sidekick
- Evil Counterpart: Could be seen as this to Lucas due to their stations.
- Kick Chick: Quite fond of kicking Knack.
- Obviously Evil: She works for Viktor, who is also this trope.
- Purple Is Powerful: She also dresses in purple like Viktor. Not to mention her Humongous Mecha.
- Save the Villain: Dies in the temple beneath Obelisk Mountain after being defeated by Knack. Then subverted when the ending reveals that she (and Ryder, who stayed behind to try and save her) survived.
- "Knack, you're no human, why do you work for them?"
- Anti-Villain: He wants to bring Goblins out of a primitive life in the forest and into cities. He's just gotta get rid of humans to do that. He also saved Charlotte, though he uses her for his own gain.
- Big Bad
- Bling-Bling-BANG!: Gundahar seems quite fond of gold. Not only does he wear golden armor, but his Humongous Mecha is gold plated.
- Fantastic Racism: The guy wants to exterminate mankind! Can't be more racist than that!
- Humongous Mecha: Unlike the other mechas in the game, he doesn't actually control his.Knack: So, you saved the best for last. Pretty. You want me to wait for you to climb into that thing, cause I'll warn you, I'm not in the most patient of moods.Gundahar: Get in it? (Chuckles) I'd only hold it back. This fighting unit is completely autonomous.
- Noble Demon: Although he wants to kill all of humans, he doesn't want to harm Charlotte because she helped them build up their army, though he'd likely go back on this if she were to betray them, which she does.
- Noble Savage
- We Can Rule Together: He tries several times to convince Knack to betray humanity and join the goblins. It doesn't work in the slightest.
- We Will Meet Again: After his armory is destroyed and he's encountered Knack and Vargas face to face, he runs off into a secret door and screams "I will be back!" The Doctor knows it'll be a while before he can build up his army again, though.
The love of Vargas' life, who he lost 20 years ago after she fell into the abyss of a cave. Turns out she's still alive, after being raised back to health by Gundahar, in exchange for building them tanks and weapons.
- Disney Death: Fell down a cliff in the cave where she and Vargas found Knack's orb. She lived, though.
- Evil Cripple: Subverted in that she's not evil, she was just forced into working for the villains. She's not even fully disabled, though she says herself that her right leg never fully recovered from her fall, and she now requires a cane to walk properly.
- Gadgeteer Genius: Worked with Vargas on making a new type of car. Also worked for Gundahar to create tanks and weapons.
- Heel Realization: She's already had it by the time Vargas finds her, and refuses to go back to human society because of the trouble she's caused. She eventually changes her mind, though.
- The Lost Lenore: It is more than obvious that, even 20 years later, Vargas hasn't moved on. Gets subverted when he discovers she's still alive.Lucas: And there really hasn't been anybody else for you?Vargas: Oh how could there be? She was smart, talented, and beautiful.
- Morality Pet: According to Doctor Vargas, she kept him from putting some of his crazier ideas into action.
- Sympathy for the Devil: Even after she's found out that Gundahar has been using her technology to attack human settlements, she still seems relieved after seeing that Gundahar survived his encounter with Knack and Doctor Vargas. It's only after he expresses his desire to kill all humans that she decides to get as far away from Gundahar as possible.
- Walking Spoiler
Morgack (Chieftain Goblin)
- "A golem made of relics..."
- Claustrophobia: Apparently. According to Ryder, goblins don't like being enclosed in small spaces for long periods of time. Ryder uses this to his advantage by keeping Morgack in the small cockpit of his destroyed mech until he discloses who Gundahar is.
- The Dragon: Could be seen as this to Gundahar, considering that Gundahar didn't actually attack any of the human settlements himself, he just gave Morgack and his underlings the means to do so.
- Humongous Mecha: He didn't make the tanks, but he managed to build his own mech.
- No Name Given: His name is only ever listed in the credits. Otherwise, he's referred to as the Chieftain Goblin in the chapter descriptions and trophy list.
Large golems that live deep underground and protect the relics from being mined by humans or goblins.
- Barrier Warrior: The small guardians can surround themselves in yellow force fields, which deteriorate as they throw lances at Knack.
- Chekhov's Gun: The giant orb who attacks Knack in the underground ruins shows up again later as part of the Final Boss.
- Evil Counterpart: The Final Guardian could be seen as this to Knack, especially after it inserts the Giant Orb into its chest. An orb that looks exactly like Knack's.
- Final Boss: The Final Guardian.
- Gemstone Assault: Each type attacks Knack with weapons made out of Sunstones: the smallest ones throw arrows and spears at Knack, the bigger ones fight with bulky swords made out of it, and the big ones Viktor's men managed to hypnotize fight by melding a huge chuck of the stuff around their left hands. The giant ones Knack faces during the final levels of the game fire arrows as well, while the Final Guardian attacks with a sword made out of jade tiles.
- Shockwave Stomp: The sword-wielding guardians can create a force field and then slam it down into a shockwave.