Guren Nash/Tenkai Knight Bravenwolf (Guren Ogami)
Voiced by: Johnny Yong Bosch (English), Meguru Takahashi (Japanese)
- Adorkable: Guren is downright adorable, and while generally a sane person, his idealism and dorky nature can surprise and affect even the most stoic of characters. Its part of what attributed to Benis mutual feelings for him.
- All-Loving Hero: Has shades of this, what with being a Kind Hearted Cat Lover and kid who thinks recycling is good for everybody.
- Animal Motifs: In Titan mode, his chest plate becomes the head of a dragon.
- Anime Hair: Guren's hair is red in the front and black in the back, which is similar to M-Ryotaro's hair from Kamen Rider Den-O.
- Berserk Button: The other knights have trouble keeping up with Guren's during his assault on Vilius's forces after his father gets brickified.
- Beware the Nice Ones: Guren is one of the sweetest, most polite, helpful kids around. But don't get on his bad side.
- Chronic Hero Syndrome: Guren does his best to help everyone regardless of his situation. Given that theyre fighting in a war with two world hanging in the balance, his idealism pushes the rest of the team to keep going. It also attributes to his friendship with Ceylan, given their idealist vs cynic relationship.
- Dating Catwoman: Downplayed, he a lot nicer to Beni even after learning she is Venetta though that doesn't stop Ceylan from calling her his girlfriend.
- Expy: That hair of his is VERY similar to Atlas.
- Good Is Not Soft: Guren is generally a nice person, but he does not hold back in battle and strives for victory. When he gets angry, he shows it not just to his friends, but as Bravenwolf, his anger channels in strength. At one pint during the second half, he demolished an entire army without going in Elemental Titan Mode just with the finish move.
- The Hero: He's the real star of this show; he leads the group and the story is generally told from his perspective.
- Heroes Prefer Swords: Guren receives a sword when he transforms into Bravenwolf.
- The Idealist: His idealism serves as an anchor for the team and why hes seen as the leader of the team.
- Lightning Bruiser:As Bravenwolf, Guren is well rounded in all categories. His special attacks are extremely power and nearly on par with Valorn, nearly moves as fast as Tributon, his shield and willpower give him a strong defense, and hes the only one to consistently fight Villus on an even playing off.
- Missing Mom: She's dead for some unknown reasons.
- New Transfer Student: Guren transfers to a new school in the very first episode of the series.
- Nice Guy: Guren is a nice guy who does his best, able to make friends and gain trust with all of the human characters. His charm leads him to viewed as not just the leader, but the face of the Tenkai Knights.
- Playing with Fire: Gets this power with the upgrade in episode 27 as Bravenwolf Tenkai Firestorm.
- Red Oni, Blue Oni: While all five kids have red oni and blue oni traits, it's more obvious with him and Ceylan/Tributon. Although it is color inverted, the red colored Bravenwolf is the blue to blue Tributon's red.
- When You Coming Home, Dad?: His father is frequently busy. There are days where he doesn't even come home at all, even though it's not like he works outside of town. This weighs on Guren, naturally.
Ceylan Jones/Tenkai Knight Tributon (Seiran Washizaki)
- An Ice Person: Gets this power with the upgrade in episode 27 as Tributon Tenkai Iceblast. Most of his new special moves involve freezing the opponents with his archery shots. Some of his Robo Fusions with Elemental Titan Mode add his cryokinesis abilities.
- Animal Motifs: In Titan mode, his chest plate becomes the head of a bird.
- Book Dumb: Ceylan isn't very interested in studying and he sleeps during the lessons.
- Class Clown: In fact, this is how and why Guren met him and became fast friends with him in the first place. Having said, Ceylan is in fact a very cautious soul, and quick to point out when something doesn't seem entirely kosher to him.
- The Cynic: In contrast to Guren's Wide-Eyed Idealist.
- Deadpan Snarker: Ceylan, definitely. About half of his lines are said in a somewhat sarcastic manner.
- Goggles Do Nothing: Wears goggles for style.
- The Lancer: He's the first to meet and become friends with Guren, and therefore he's closest to him. His jokester tendencies also contrast with Guren's more pondered nature.
- Sad Clown: Ceylan appears to suffer from self worth issues that have made him consider leaving the team on more than one occasion. Nevertheless he's appointed himself the team's "funny-man", trying his best to appear the carefree joker when deep down, he's anything but carefree.
- Red Oni, Blue Oni: Color inverted. Tributon is blue yet is the red to the red Bravenwolf's blue.
- Refusal of the Call: Ceylan is at first overwhelmed by the responsibility of the universe hanging over his head and promptly decides to not continue fighting. He changes his mind by the end of the episode.
- You Gotta Have Blue Hair: Ceylan's a solid blue.
Chooki Mason/Tenkai Knight Lydendor (Chuuki Hachisuka)
- The Ace: Chookis great at athletics, intellect, and good at battle. Hes still a Nice Guy though.
- Animal Motifs: In Titan mode, his chest plate becomes the head of a reptile.
- Born Lucky: Chooki is so mind-bogglingly lucky that it defies logic. He wins every game he plays. Ceylan attributes it to supernatural powers.
- Child Prodigy: In the field of sports.
- Jack-of-All-Stats: Lydendor excels in all areas. Hes fast on the ground and his chain mace works offensively and defensively. In Titan Mode, his hand to hand combat improves his fighting capabilities, and his agility takes a boost. By the time he gains Lydendor Elemental Titan Mode, he becomes a literal Lightning Bruiser with no weakness, and increased Tenkai Energy in all of hi stats.
- Lovable Jock: He's awesome at sports, which he frequently uses as analogy for all sorts of situations.
- Shock and Awe: Gets this power with the upgrade in episode 27 as Lydendor Tenkai Lightning Strike. He can move at the speed of lightning, and his special move, Thunderbolt Break allows him to shoot electricity from his body to the sky, causing lightning bolts to zap his targets. In Elemental Titan Mode, Lydendor covers himself with and charges at the enemy with full lightning.
- The Smart Guy: Lydendor is the genius and strategist of the team. While Bravenwolf is headstrong and idealistic, Lydendor uses his knowledge to develop plans to make note of his enemies strengths and weaknesses for victory. Even in sports, he is a playmaker.
- Smart People Play Chess: One episode shows him beating a much older man at chess.
- Sore Loser: Downplayed. He doesn't behave inelegantly, but he still takes it pretty hard when someone beats him at some sport, and is prone to brooding about it.
- The Strategist: Chooki often comes up with the battle plans.
- Throwing Your Shield Always Works: In his Titan mode, Lydendor's bladed shield becomes his main weapon over his flail.
- Wise Beyond His Years: Is more level-headed than the other boys.
Toxsa Dalton/Tenkai Knight Valorn (Takusa Kameyama)
Voiced by: Ben Diskin (English), Maki Mizuma (Japanese)
- Animal Motifs: In Titan mode, his chest plate becomes the head of a turtle. The armor on his back also resembles a turtle shell.
- Ascended Fanboy: Toxsa has always been into video games, so becoming a Tenkai Knight was easier for him to get a handle on.
- Big Eater: Not really given much focus, but Toxsa eats a lot.
- The Big Guy: Valorn is the bulkiest of the Tenkai Knights. Combined with Toxsa's personality, it makes him something of a musclehead. Toxsa, ironically, is the tiniest of the guys.
- Blade on a Stick: Weapon of choice as Valorn.
- Bratty Half-Pint: Shortest and most obnoxious of the four.
- Cloud Cuckoolander: Toxsa is definitely the most cooky of all the boys.
- Dishing Out Dirt: Gets this power with the upgrade in episode 27. As Valorn Tenkai Terrablast, his special move generates a miniature earthquake by slamming his spear into the ground, causing many rocks to launch at the target.
- Geeky Analogy: Often references things he did in a video game to what's happening at the moment.
- Hot-Blooded: All the boys are a little hot-blooded to a degree. But Toxsa is definitely the most hot-blooded of them all.
- Leeroy Jenkins: At times. This has caused him to lose a few of his battles, causing him to rethink using strategy.
- Mighty Glacier: Valorn is the strongest of the Knights and with his upgraded Titan Forms, his defense makes him the most durable of the four, but hes the slowest, even when he gains wings.
- Nonstandard Character Design: Although his smaller size is justified given that he's a year younger than the others, Toxsa's eyes are much larger and rounder while his irises are much smaller.
Voiced by: Crispin Freeman (English), Yosuke Akimoto (1st voice), Nobuo Tobita (2nd voice) (Japanese)
- All According to Plan: Says it word for word after his defeat in episode 13.
- Authority Equals Asskicking: A completely Justified Trope.
- Back from the Dead: Vilius is resurrected when he dies and proceeds to revive his dead henchmen afterwards.
- Big Bad: Vilius started the war for Quarton and seeks the Tenkai Dragon. While Gen had plans to overthrow him, Vilius sees through this and turns the tables against him.
- Big "NO!": When the Tenkai Knights (plus Gen) defeat him in their new Phoenix Mode.
- Card-Carrying Villain: Villus emphasizes control, deception, destruction, and corrupting anyone to his side. Unlike most examples, hes dangerous and his vice contribute to his effectiveness as a villain.
- The Corrupter: A rather literal case, he has the ability to turn Corekai into the Corrupted.
- Enemy Mine: Averted in the Beast King arc. Despite being in the same situation as the Tenkai Knights, he really doesn't wish to collaborate with them against Scorpidon and Orengor. Though he does note at one point, "It's hard to decide who to root for".
- Evil Overlord: He rules the Corrupted as an emperor with an iron fist over his minions and generals unopposed.
- Evil Wears Black: A common trait found in the Corrupted forces.
- Fallen Hero: According to the official website, Vilius was once part of the Tenkai Knights himself, a highly respected part of the Corekai, until his greed got the better of him and he was cast out. It was then that he decided to overthrow the Corekai and eventually rule the entire universe.
- Killed Off for Real: In the episode 52, he is finally killed by Guren/Bravenwolf, thus ending his reign once and for all.
- Tin Tyrant: Vilius is a power-hungry tyrant who has a mechanical armor.
- You Have Failed Me: Hoo boy, he never tolerated a single failure . When everytime his soldiers and minions fail on their missions to defeat the knights, he will kill or torture them repeatedly.
Voiced by: Steve Blum (English), Hisao Ogawa (Japanese)
- Animal Motif: Granox's design is meant to resemble a rhinoceros.
- The Brute: Granox is the strongest and violent of Villus forces, but he is not known for his strategic genius.
- Dirty Coward: One thing he and Slyger have in common. When things get really bad, he gets going.
- Evil Sounds Deep: A more guttural voice.
- Glass Cannon: Granox seems invincible at first, but he goes down just as easy as Slyger once he's hit.
- It Has Been an Honor: Presumably attempts to tell this to Slyger, knowing that they might lose to Chooki and Toksa in their final showdown. Slyger was too full of himself to let him finish, though.
Voiced by: Crispin Freeman (English), Atsushi Imaruoka (Japanese)
- Animal Motif: While his speech and mannerisms seem to evoke serpents, Slyger's large claws and Titan Mode goes with a cat/panther motif.
- Blood Knight: Much more eager to cause destruction.
- Dirty Coward: Same as Granox. Once hes outmatched, he tries to run away, only to be immediately decimated.
- Fragile Speedster: Slyger is very fast, matches Tributon in speed and can outpace his opponents with a barrage of slash attacks. However, he doesnt have the strength to finish his opponents off on his own. He's faster than Granox, but not by much, and he can easily be defeated in a few hits.
- Smug Snake: He's definitely smug and enjoys bragging about his strength to everyone, annoying even Granox.
- Wolverine Claws: He has two claws on his arm gauntlets as his primary source of attack.
Gen Kurai/Tenkai Knight Dromus (Gen Inukai)
- Adorkable: Gen is Not So Above It All as he believes himself to be. Demonstrated when he's reluctantly covering for the knights when Toxsa is brickified by distracting Wakamei.
- Animal Motifs: Since Dromus is Bravenwolf except black, he also gets a dragon motif.
- Blow You Away: Gains wind powers from his Elemental form.
- The Dragon: He acts as Villus right hand man, organizes some of his plans in the background, contributes to his plans on both worlds, and is the the most competent of the four generals in terms of combat, but he has his own agenda and plans to usurp power from his boss.
- Emo Teen: Gen has the appearance (although not the personality) of this. Lampshaded by Toxsa himself.
- Evil Counterpart: Dromus serves this to Bravenwolf, said same goes to Gen to Guren and in addition to being The Rival.
- Expy: Gen strongly resembles Sasuke with the hairstyle, clothing, personality, emo appearance (this is lampshaded by Toxsa himself), and even share the same voice actor, Yuri Lowenthal. He also works with Vilius under the guise of Tenkai Knight Dromus; and serves as The Rival and Evil Counterpart to Guren.
- HeelFace Turn: Joins the Tenkai Knights in episode 26 when he assists them in defeating Villus, but is worried about formally joining them as a team for while. He still assist them in episode 27 and onward, trying to atone for most of his actions.
- Lightning Bruiser: Hes just as strong and speedy as Bravenwolf. In terms of defense, he can tanks hits from Villus and rise back up. In Elemental Mode, his wind attacks boost the speed and range of his physical abilities, his hand to hand combat, and has defensive options with tornadoes and whirlwind attacks.
- Perpetual Frowner: Even after he joins the Knights, he does little smiling.
- The Quiet One: Gen doesn't like to socialize with other people. This is because he is working with Vilius and prefers to work alone in secret.
- Sixth Ranger: Joins the Tenkai Knights in "A New Knight" when he realizes that destroying both worlds isn't what he really wanted. He acts as an Aloof Ally in the second half of the show, but continues to assist them more in his human form. Once he official accepts them as his friend, his transformation into Dromus Tenkai Whirlwind cements him as an official member.
- The Starscream: Gen's not even being subtle around Vilius about the fact that he's just using him to get the Tenkai Dragon's power for himself.
- The Stoic: He isn't really that emotional.
- Straw Nihilist: Whatever happened to his family caused Gen to become this and seek to destroy all worlds. Guren calls out how pathetic he is for it and makes Gen start to realize this.
- Used to Be a Sweet Kid: As seen in a flashback, Gen was able to smile once.
Beni/Tenkai Knight Venetta
- Action Girl: As Venetta, she can match most of the Tenkai Knights and the Corrupted without relying on upgrades or powerups.
- Animal Motifs: Look at Venetta's back and you may notice there's a spider there. The green dots all over her body are also meant to resemble spider eyes.
- Cute and Psycho: Beni likes flirting with Guren and planning the utter annihilation of her own species, all in the same sentence.
- Dark Action Girl: Beni becomes one when she is Venetta. It depends on whos side shes willing to support, but nonetheless effective at her fighting prowess.
- Dark Chick: She serves Villus as part of her alliance with Dromus and occasionally supports his team. Shes dangerous, manipulative, and often the one Guren tries to redeem, but her selfish nature usually lands her on the side of villainy. This was eventually averted when she learns the truth and joins the team.
- 11th-Hour Ranger: Joins the Knights in the last 5 episodes of the season as The Chick with her Women Are Wiser and Holier Than Thou attitude on the side of good.
- Expy: She resembles Simca the Swallow, as they both have pink hair and both share the same personalities.
- Femme Fatale: Beni prefers to use her charms to try and manipulate people, most notably Guren. It doesnt always work, but she still powerful and knows it.
- High-HeelFace Turn: It takes her long to switch sides, but with Gurens heart and Kinos innocence, she eventually switches sides, helping out the Knights, albeit repaying her debt to Guren and Gen.
- Lady of War: Venetta certainly is one of these.
- Pink Means Feminine: Ceylan openly assumes that the newest Tenkai Knight must be a girl due to "Venetta" wearing almost completely pink armor. Chooki calls him out on his bias and tells him not to make assumptions. Turns out, Ceylan was right.
- Women Are Wiser: Seems to have this attitude since many of her insults involve things like "he's just a typical boy". That attitude contributes to her decision not to side with the Knights in the beginning: thinking logically, Villus and the Corrupted have the advantage, and Guren cant win with idealism alone.
- Cool Old Guy
- Eccentric Mentor: Loves espousing weird Ice Cream Koans.
- The Mentor: To the boys, teaching them about Quarton, the Tenkai Knights, and their enemies.
- Mysterious Past: He has a Core similar to the boy's, he often vaguely alludes to his past but never explains himself fully.
- Retired Badass: Once implied to Guren that he used to go to Quarton.
Mr. Nash (Mr. Ogami)
- Parental Neglect: While he does spend most of his time working, he really does care about Guren.
- Workaholic: Instead of seemingly being distant from his son, he acts like a pretty cool dad onscreen and hasn't been seen actually working yet, but it's said that he spent the last two years working instead of paying any attention to his son and has had moved do to work three times during that period.
Wakamei Dalton (Wakame Kameyama)
- Cool Big Sis: Despite their differences, Wakamei does her best to be one for Toxsa.
- Double Standard: Abuse, Female on Male: She beats Toxsa whenever he annoys her (that's pretty often).
- Hot-Blooded: Like brother like sister.
- Secret Secret-Keeper: She eventually finds out about Quarton, the Knights and everything. She pretends not to know to humor Toxsa.
- Tough Love: Wakamei's a big fan of this.
- Cannot Tell a Joke: Or trash-talk.
- Hero-Worshipper: Beag practically worships the ground the Tenkai Knight's walk on and often marvels at every thing they say and do, not knowing they're four pre-teen boys from earth. He's also usually the one explaining to them how things work on Quarton and what's going on at the moment.
- Honorary True Companion: Beag is not an official member of the Tenkai Knights, but as the leader of the Coredaki, he is the strongest and closest ally of the Knights army.
- Large Ham: Has a rather grandiose style and tone of speech.
- Sixth Ranger: The Knights consider him as one, especially after all the times he's supported and allied with them.
The Guardians (Boreas, Eurus, Zephyrus, and Notus)
Voiced by: Steve Blum (Boreas), Kyle Hebert (Eurus and Notus), Matthew Mercer (Zephyrus) (English), Shigenori Soya (Boreas), Hideyuki Umezu (Eurus), Junichi Yanigata (Zephyrus), Michiko Neya (Notus) (Japanese)
- Apologetic Attacker: Notus while fighting the Knights under Vilius' control.
- Balance Between Good and Evil: Their task is to oversee this.
- Big Good: They watch over the peace in Quarton.
- Bigger Bad: Eurus served this in the first half before realizing he let Vilius go to far.
- Brainwashed and Crazy: By Vilius in the second half of the show.
- Color-Coded for Your Convenience: Blue, red, green, and yellow, respectively. No relation to the Knights, tho.
- Dub Name Change: Minor example, but, for some reason, Zephyrus and Notus' names are reversed from the Japanese version.
- Evil Makeover: Their silver armor becomes black under Vilius' control.
- Greek Mythology: Named and styled after the Anemoi, Greek deities of the wind.
- Hufflepuff House: Zephyrus and Notus don't get as much focus as the other two.
- Mentor Archetype: In the first half of the show, Boreas directly guides and advises the Tenkai Knights.
- One-Winged Angel: They all have the ability to fuse with multiple robots to become giant beasts. This is called Mega Fusion.
- She's a Man in Japan: Notus is female in the Japanese version.
Kiro Mason (Kiiro Hachisuka)
Voiced by: Laura Bailey (English), Maasa Kobayashi (Japanese)
- Annoying Younger Sibling: She's Chooki's cousin, but otherwise behaves like the essence of this trope, constantly nagging him to let her have fun and crying loudly when she can't.
- Chekhov's Gunman: Is the one to finally give the Knights the Tenkai Stone.
- Girls Love Stuffed Animals: Has a rabbit or dog-looking thing named Sandy that she carries around at all times.
- Morality Pet: Makes Beni take a definite turn for the better.
- Strong Family Resemblance: Blond hair, green eyes, and same facial structure as Chooki. Lampshaded by the others.
- Everything's Better with Monkeys: If the name didn't clue you in.
- Informed Species: His name evokes orangutans, and while he is red, he is otherwise too hairless and has too light skin to really be one.
- Screwy Squirrel: While he claims to be doing the things he does to humor Scorpidon, his glee while doing them suggests otherwise.
- Small, Annoying Creature: His nonsense really grates on the protagonists' nerves.