* BadassDecay: Reese gets hit with this pretty hard towards the end of ''Guardian Force.'' For most of the show she's a competent warrior and a constant threat with her piloting skills and ManipulativeBitch schemes, however once Hiltz disposes of her and she starts traveling with Raven she's demoted to a sideline position where she can't do anything for the final episodes other than cry and scream Raven's name.
* CompleteMonster:
** Gunther Prozen, the EvilChancellor of the Guylos Empire and the BigBad of [[Anime/ZoidsChaoticCentury season 1]], keeps a pointless war with the Helic Republic going so that [[AmbitionIsEvil he can seize control of the Empire]]. Attempting to [[WouldHurtAChild murder the child emperor Rudolph]], Prozen sends his personal killer, a boy he indoctrinated from childhood named Raven, after him while also sending "rescue squads" that he has Raven destroy in order to cover himself while he continues the war. Prozen then attempts to awaken the ancient weapon the [[SealedEvilInACan Death Saurer]] and demonstrates its power by attacking his own capital. Even after defeat, Prozen adopts the identity of the Dark Kaiser with intention of re-awakening the Death Saurer and [[OmnicidalManiac wiping out organic life]].
** The second BigBad of the series, from season 2--''Guardian Force''--Hiltz is an Ancient Zoidian who [[KillAllHumans desires to exterminate all human life]] and rule Planet Zi himself. Initiating a series of terrorist attacks to destabilize the hard-won peace, Hiltz [[YouHaveFailedMe kills any men who fail him]] and even tries to kill his [[TheDragon right-hand woman]], another Ancient Zoidian named Reese, just because [[YouHaveOutlivedYourUsefulness she's no longer useful to him]]. Revealing his secret weapon the Death Stinger, Hiltz proceeds to bombard civilian targets and announces that when he proceeds to the Guylos Empire, he'll destroy every civilian town and city he sees along the way. Finally fusing with the Death Saurer, the {{sadist}}ic Hiltz dedicates himself to exterminating all organic life on Zi, gloating how he will be the one to rule over everything.
* [[SugarWiki/AwesomeMusic Crowning Music of Awesome]]The music for the anime is some of the best around, and it's used frequently for non-fiction history and military shows in the US.
** The [[https://www.youtube.com/watch?v=GPmJPMzKFmM English intro]] really gets your blood pumping.
** The best example for Crowning Music Of Awesome in the anime would probably be [[http://www.youtube.com/watch?v=07cNDoNinww this]].
** [[http://www.youtube.com/watch?v=chUgh-EXJmQ Death Saurer! Complete with the bells in the background.]]
* DracoInLeatherPants: Raven is an egomaniacal bloodthirsty killer who starts off as Prozen's attack dog, and later goes rogue and becomes a terrorist. He abuses and belittles Shadow, wants to commit genocide against all Zoids, and will even murder his own allies; yet we're meant to feel sorry for this jerk because he has a [[FreudianExcuse tragic backstory]]. Predictably, he has ''tons'' of fangirls.
** His [[spoiler: HeelFaceTurn]] near the end of the series, his sincere grief and regret over his actions when [[spoiler: Shadow is killed]], and his PetTheDog moments with [[spoiler: Reese]] probably have a lot to do with this as well.
* EnsembleDarkhorse: O'Connell has quite the fanbase [[GermansLoveDavidHasselhoff in the US]] despite having a relatively minor role.
* EpilepticTrees: Fans have speculated that an uncut dub for this series (as well as ''[[Anime/ZoidsNewCentury New Century/Zero]]'') exists in some capacity considering some of the slip-ups of swearing and blood occurring during it's American broadcast. Since the series has been absent from western shores for many years now, this may never be known.
* FanNickname: "Guardian Force" for the Post-TimeSkip episodes. These episodes were still officially titled "Chaotic Century".
* FanPreferredCouple: Let's see... [[ImpliedLoveInterest VanxFiona]], [[CargoShip VanxZeke]], [[FoeYay VanxRaven, SchubaltzxO'Connell]], [[HoYay VanxIrvine]], [[TheLancer Irvine]][[CoolBigSis xMoonbay]]... Mind you, these are just the most common!
* FirstInstallmentWins: Most fans agree that the best storyline and CharacterDevelopment happens in this series. The others have their charm but are not as respected.
* HilariousInHindsight: In one instance Fiona is caught by one of Rosso and Viola's henchmen, who comments that she's cute and will be a "real knocker in few years." Come the timeskip in Guardian Force, we see he was right on the money.
** Season 2 villain Hiltz is very much similar to [[Franchise/{{Naruto}} fellow Akatsuki member]] Sasori, an EvilRedhead who have a scorpion-like machine (or doll in Sasori's case) as a weapon. They even share [[Creator/{{TakahiroSakurai}} the same japanese voice actor]]!
%%* IdiotPlot: Chaotic Century suffers from a SERIOUS case, to the point where the plot moves forward not because of the skill or resourcefulness of the protagonists, but because of the stupidity of the villains.
* NightmareFuel: [[http://oi39.tinypic.com/fmjp1g.jpg Hiltz when he merges with the True Death Saurer's Core.]] [[http://oi41.tinypic.com/2unycur.jpg Which then starts sprouting the faces of the Death Saurer's previous hosts.]] Try to even describe what that looks like.
* TearJerker: When [[spoiler:Irvine's Command Wolf]] bites the dust after being hit by Raven's charged particle cannon. More specifically, the monologue that [[spoiler:Irvine]] delivers to the dying Zoid is what pulls the heartstrings.
** [[spoiler:It gets better though, in the form of a Mid Season Upgrade]].
** Rudolph's blood-curdling scream when [[spoiler: Van's Shield Liger gets destroyed]].
** The death of [[spoiler: Shadow. Raven's breakdown after shows that he really did care about his organoid. Shadow was the only familiy he had left and now he's gone.]]
* TooDumbToLive: Van's Shield Liger's E-shield is almost never used.
* ToyShip: Van and Fiona in Chaotic Century.