Check the Beast Wars character sheet for the returning cast.
- The Big Guy: He tends to be the most hands-on member of the team.
- Emo Teen: He whines a bit and is kind of egocentric.
- Jerk with a Heart of Gold: He's rather abrasive at times, but he still helps out the other Maximals and assists them in putting an end to Megatron's reign over Cybertron.
- Make Me Wanna Shout: His power is a sonic scream.
- Our Vampires Are Different: Nightscream can shoot his fangs at an enemy and drain the energy from them via a connecting cable.
- Sole Survivor: As far as the Maximals know, anyway. Nightscream is the only one they find, but then they never really leave Cybertropolis.
- Survivor's Guilt: He feels really bad that he was unable to save those who fell during Megatron's conquering of Cybertron.
- Tagalong Kid: He's implied to be younger than the other Maximals and pretty much joins them because he tags along.
- Department of Redundancy Department: He turns from beast mode (upright-walking wolf) to beast mode (alligator-dragon).
- Heroic Sacrifice: Sacrifices himself to save Nightscream's life in the third part of "Sparkwar".
- Instant Awesome: Just Add Dragons!: Savage is a dragon-like being.
- Jekyll & Hyde: Noble is benign to a fault and Savage is uncontrollable. Initially this turns out to be an act since Noble is actually Megatron stuck in his organic half. After they split, the trope is played somewhat straight - though neither Noble nor Savage display any sentience.
- Mix And Match Creature: Of a dragon and a wolf.
- Noble Wolf: Fittingly enough, the wolf aspect calls itself "noble" and is a pretty Nice Guy.
- Redemption Demotion: A very strange case. After Megatron's spark takes over the Grand Mal his Noble/Savage body continues to live on with only a primitive animal intelligence.
- Team Pet: After Megatron's spark leaves him, he pretty much becomes the Maximals' pet.
- Action Girl: Although she dislikes violence.
- Affirmative Action Girl: She is the first female Transformer to debut in Beast Machines
- Belligerent Sexual Tension: With Rattrap. The two initially don't get along, but later become an Official Couple.
- Department of Redundancy Department: While all robot modes in Beast Machines have aspects of their beast mode, and all of the beast modes are cybernetic, she turns from humanoid plant to humanoid plant with the main differences being one has four arms. In her initial "feral" state, the hands were the jaws of a two-headed Audrey II-like creature, but her reformatted alt mode was a completely new form based on an orchid.
- Green Thumb: She helps Optimus Primal restore the plants to proper health.
- Plant Alien: She's a Cybertronian who turns into a plant.
- Shock and Awe: A rarely-used chain lightning attack that vaporised a swarm of tank drones in her debut.
- Shout-Out: The planet where she got her "beast mode" comes from Mainframe Entertainment's other toyline based cartoon.
- Technical Pacifist: Was originally a Actual Pacifist, but after she has a vision she becomes this to save Cybertron.
- The Smart Guy: She serves as the brains of the team.
- Toyless Toyline Character: She never received a toy, possibly due to the fact it would be too complex.
- And I Must Scream: Subverted. Waspinator was fully aware of what was going on, but didn't care because he enjoyed it so much. It's also slightly implied that he had greater control than Jetstorm and Tankor, citing his "the brooding loner bit."
- Badass Biker: Well, bike, anyway.
- Brainwashed and Crazy: Certainly brainwashed, though he was always crazy. Turns out Thrust was created from Waspinator's spark.
- Butt-Monkey: For a while mid second season, it seemed as if Thrust resumed Waspinator's old role, being bashed by everyone. Given that he is Waspinator, this was likely intentional. By the end of the series, he has regained the respect of his fellow Vehicons and is no longer bashed around.
- Card-Carrying Villain: He knows that he's in the wrong and couldn't care less.
- The Dragon: For part of season 2, he serves as Megatron's remaining lackey.
- Enigmatic Minion: He is suggested to have plans of his own, but it's never revealed what they are.
- Evil Sounds Deep: He has a deep and sinister voice.
- Honor Before Reason: He doesn't care about what Megatron will do to Cybertron.
- The Slow Path: It eventually turns out that he's Waspinator, who was rejected by the anthropods who worshiped him as a god at the end of Beast Wars and went back to Cybertron, his journey apparently taking long enough that he doesn't make it back until the series' present time.
- That Man Is Dead: Actually, he's the only one of the original three not to bother with this trope at all.
- Took a Level in Badass: In contrast to his time as Waspinator, Thrust is no longer an inept fool who keeps getting blasted apart.
- Undying Loyalty: He was Megatron's faithful servant until the very end even when the latter was seemingly killed. He has nothing but hatred for any perceived traitors, especially Jetstorm/Silverbolt.
- And I Must Scream: As Silverbolt, he indicates that he was aware of what Jetstorm was doing as well.
- The Atoner: After returning to being Silverbolt he tries to make up for what he did as Jetstorm.
- Ax-Crazy: Even by Transformers villain standards, Jetstorm is completely out of his mind.
- Badass Boast: Which doubles as an Establishing Character Moment.
- Battle Couple: With Blackarachnia.
- Brainwashed and Crazy: Jetstorm was created by implanting Silverbolt's spark into a Vehicron body.
- Card-Carrying Villain: He's really proud of being evil.
- Everything's Better with Samurai: After his reformat, his robot mode is designed to look like a samurai.
- Evil Has a Bad Sense of Humor: Which doesn't stop him from being absolutely hysterical at times.
- Evil Laugh: "Whoa-AH hahahahahaha!!!"
- Faux Affably Evil: He acts friendly towards the Maximals even while trying to destroy them.
- HeelFace Turn: After being reformated he joins the Maximals again.
- Jerkass: He is extremely mean to the Maximals.
- Knight in Shining Armor: Subverted. He's a nasty person through and through until he's reformatted back to Silverbolt.
- Knight In Sour Armor: After his reformat, he's back to being a good guy, but isn't quite as idealistic as he once was.
- Laughably Evil: Jetstorm is without a doubt, insane. But he's also loads of fun to watch.
- Sixth Ranger: Joins the Maximals after being reformatted.
- Something Only They Would Say: When Silverbolt's spark briefly overtakes Jetstorm, he dramatically holds Blackarania and calls her "dark venom of [his] heart!" She notes that there's only one person who could say something like that with a straight face.
- That Man Is Dead: Jetstorm is actually just a shell program created by Megatron, so he "dies" when Blackarachnia reformats him into Silverbolt.
- Conversely, after finding out the truth, Jetstorm was emphatic that "Silverbolt had left the building!"
- In the finale, it appears Silverbolt is back to his pre-Jetstorm self.
- And I Must Scream: Rhinox says that he was trapped inside Tankor, fully aware of what was going on, but unable to reach the surface and communicate.Rhinox: Trapped! Abandoned!
- Brainwashed and Crazy: Subverted, he was always on the evil side.
- Diabolical Mastermind: After regaining his intellect.
- Death Equals Redemption: After his death, Rhinox acknowledges that his actions were wrong and becomes one with the Matrix.
- Dumb Muscle: Subverted. Tankor is inarguably dumb and powerful, but exactly how aware or in control Rhinox is of Tankor's actions is never really clarified.
- Hulk Speak: His initial speech style has him speak in third person with limited vocabulary.Tankor: Tankor destroy! Tankor destroy! Tankor DESTROY!
- Manipulative Bastard: To the point of forcing Megatron himself to do whatever he wants, without his knowledge... until Megatron turned all the gambits to his favour.
- Obfuscating Stupidity: Upon regaining his true personality, he still pretends to be a dim-witted minion.
- The Starscream: Once he regains his intellect, anyway. He would have succeeded if Megatron hadn't been smart enough to hardwire his programing to ensure that he could never kill him.
- Tank Goodness: It's in the name.
- That Man Is Dead: His spark is actually that of Rhinox, but he fully embraces being on Megatron's side.
- Third-Person Person: He initially refers to himself in third person.
Obsidian & Strika
- Affirmative Action Girl: Strika was made a female to address the gender imbalance. The writers also introduced Botanica, a prominent character with no toy, for the same reason.
- Anti-Villain: They don't care about Megatron or the Maximals. They serve Cybertron, and since Megatron essentially is Cybertron, they serve him. Anything else is details.
- Awesome Personnel Carrier: Strika. She's even named after a real life example, the Stryker.
- Badass Bookworm: Obsidian is very intelligent and also a very powerful lackey of Megatron.
- Battle Couple: They often fight together and Strika is described by Obsidian as his consort.
- Brains and Brawn: Both are brilliant tacticians, but Strika is easily the more combat oriented of the two. Obsidian's more of a strategist, co-ordinating drone attacks.
- Co-Dragons: They become Megatron's two most prominent minions.
- Evil Brits: They have British-sounding accents.
- Evil Sounds Deep: Both of them have deep voices.
- FaceHeel Turn: According to supplementary materials, they were Autobots during the Great War.
- Future Copter: Obsidian's basically a futuristic version of the V-22 Osprey.
- Genius Bruiser: Strika is as intelligent as she is strong.
- Hero Killer: They are said to have fought in Cybertron's ancient past and have implied to have killed many noble Cybertronians.
- Hulk Speak: In their Establishing Character Moment, they use this to trick the Maximals into thinking that they're just another pair of mindless Vehicon drones.
- Knight Templar: They honestly believed that Megatron's intentions were right for Cybertron.
- Multiple-Choice Past: Were they Maximals, or Predacons, or even Autobots? No media has ever been consistent on that one, though they're usually former Autobots more often than not.
- My Country, Right or Wrong: They are both extremely loyal to Cybertron - even if the guy running it happens to be an organophobic lunatic with a God complex."Megatron is Cybertron. To defend one is to defend the other."
- Thrust calls them on it.Thrust: If you're loyal to everyone, can you really be loyal to anyone?
- Thrust calls them on it.
- Obfuscating Stupidity: They lure Primal's team into a trap during their first appearance by pretending to be mindless drones and deceiving the Maximals into believing that they're trying to escape.
- Pet the Dog: Obsidian made his debut by backhanding Thrust for annoying him. In "Spark of Darkness", Megatron refers to Thrust as "utterly useless", but Obsidian states that it was Thrust who reminded him and Strika where their true loyalties lie. note
- The Strategist: They were two of the most brilliant Maximal/Autobot generals in the history of Cybertron.
- Tiny Guy, Huge Girl: Obsidian is quite frail while Strika is huge.
A small, spherical drone that acted as, more or less, Megatron's butler.
- Brainwashed: Is reprogrammed by Tankor to serve him in his vendetta against Megatron.
- Cyber Cyclops: His eye is actually the middle one, not the two lights on the side of the "face".
- Demonic Possession: Killed by the energy storm started by Tankor, his body comes to house Megatron's wayward spark.Megatron: I live! I live! I...what kind of puny body is this?!
- Flight: Floats around.
- Evil Brit: Despite being Cybertronian, he has a British accent.
- Non-Action Guy: As he has no offensive capabilities, and could probably be taken down in one shot.
- The Soulless: Despite his intelligence and personality, it's explicitly stated that he has no spark.