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.
Ensemble Darkhorse: Norris Packard is an honorable old soldier who is as loyal as he is awesome, and that's why we love him despite him getting relatively little screen time.
An even odder one: an unnamed Zeon woman who only appears to report on Norris' signal to launch the Kergeren. Her cute looks and being used as a Zeon operator in various games led to a fan following on 2chan who dubbed her Kergerenko which caused her to appear in MORE games and even as part of the promotional material for said games.
Fanfic Fuel: Ginias's lightly-touched Freudian Excuse and what little backstory was given for him and his sister are just enough to get fans' word processors put to use on occasion. The fact that some fans think Ginias might've been an abused child (extrapolated from the implications of their family being dysfunctional and the belief that his breakdown was fueled by deep-rooted trauma instead of purely biological factors) doesn't help. Needless to say, Ginias probably has the greatest risk of becoming a Draco in Leather Pants out of the cast.
Nightmare Fuel: Your Mech has been disabled and its sensors destroyed, leaving you trapped in the coffin-like cockpit, completely blind as to what's going on outside, while you are absolutely aware that the enemy ace is standing right there ready to kill you like he has the last three opponents he faced in the last ten minutes. Nothing happens. Cue minor Freak Out!.
And then there was the wonderful time where you bear witness to the gas attacks as seen in Gihrenís Greed.
Purity Sue: Some takes on Aina get dangerously close.
Ron the Death Eater: Ginias is no saint, but some fans seem to think being a backstabbing, Axe Crazy murderer also makes him the sole person who should take the blame for what happened to the Keregeren (even though Colonel Lyers is the one who chose to shoot that in retaliation instead of the Apsaras), physically and sexually abusive of Aina, worse than Giren Zabi and Char Aznable combined, and completely incapable and devoid of any genuine concern or love for anyone (which contradicts many of his scenes with Aina early in the series). He's a terrible person, but there's no need to condemn him for things he didn't actually do.
The Scrappy: both Ginias and Michel get a fair share of hate from most of the fandom. The former for his villainy, the latter for being perceived as a whiny and inexperienced kid.
Strangled by the Red String: Aina and Shiro. Meeting each other once in space was all it took for Shiro and Aina to get hooked between one another.