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.
Designated Hero: While no one will argue Artha's intentions, it's a bad sign when his most heroic episodes usually required one of his friends or someone in authority to hold a massiveIdiot Ball to set it up.
Moordryd (due to his Anti-Villain, Whip It Good tendencies), Beau (for being just so funny) and arguably Pyyrah (first and main female crew leader, fun to imagine a personality for, since she really exited to swap alliances as the plot demanded).
Rivett tended to have a high rating among fans, due to being "cute," cunning, and Badass.
Marty Stu: Lots of people accuse Artha of being one of those in the first season. But after episode 13, Artha STARTS to develop a personality.
And even more of an ego. And since only a few episodes (a Wham Episode, usually) had an effect on continuity, it was never truly dealt with. Pride of the Hero and its implications went ignored by the writers (but not the fans), Artha the Drac had no impact overall outside of introducing Vociferous as a One-Episode-Wonder, and everything not explicitly related to him tended to go by the wayside, despite having a personality.
One-Scene Wonder: Most due to the efforts of fans making them memetric, since no one got more than an episode as anything other than a Living Prop, but:
Vociferous: set up as a rival to Moordryd, but it was never followed up on. Fans tended to make plots out of that dropped idea.
Marianis: either because unlike Pyyrah she had a personality, or because the fans liked pairing her with Moordryd.
Rivett: got an episode and short scene in another, becoming the main Ensemble Darkhorse out of sheer awesome and cunning.
Periphery Demographic: A big one—most of the fans on the forums were girls older than 12. They were mostly brought in becuase of Moordryd, and later Rivett.
Villain Sue: Word never really got any serious come-uppance, and he never displayed too much Magnificent Bastard, just barely not being proved guilty or just never being considered (Moordryd and the Dragon Eyes being the one with the bad PR).
Until Moordryd became the Shadow Booster, and started breaking away from him, that is. Word actually got an Enemy Mine with his son (that he did not recognize), Mortis, and the Dragon Booster in the finale.