These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Draco in Leather Pants: 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 tragic backstory. Predictably, he has tons of fangirls.
His Heel-Face Turn near the end of the series, his sincere grief and regret over his actions when Shadow is killed, and his Pet the Dog moments with Reese probably have a lot to do with this as well.
Ensemble Darkhorse: O'Connell has quite the fanbase in the US despite having a relatively minor role.
Fan Nickname: "Guardian Force" for the Post-Time Skip episodes. These episodes were still officially titled "Chaotic Century".
Hilarious in Hindsight: In one instance Fiona is caught by one of Rosso and Fiola'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.
Idiot Plot: Chaotic Century suffers from a SERIOUS case, to the point where the plot moves foreward not because of the skill or resourcefulness of the protagonists, but because of the stupidity of the villains.
Tear Jerker: When Irvine's Command Wolf bites the dust after being hit by Raven's charged particle cannon. More specifically, the monologue that Irvine delivers to the dying Zoid is what pulls the heartstrings.
It gets better though, in the form of a Mid Season Upgrade.
To this Troper, Rudolph's blood-curdling scream when Van's Shield Liger gets destroyed.
Rosso and Viola's romantic exchange in the cockpit of an Iron Kong before it gets electrocuted to hell by Raven's Geno Saurer.