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.
Moral Event Horizon: Georca, when he "activated" Tina and started a revolt culminating with a siege in the royal palace.
Tear Jerker: Lots of them. Some that really stand out are when Hiisuma dies, Duma's Dark and Troubled Past and pretty much the second part of the Greecia flashback arc.
What Do You Mean, It's Not for Kids?: The title and art style, plus the focus on young protagonists (even for anime) might convince some that this is a kids' show. Luckily, the series opens with some rather dark imagery which should help get the message across that this series isn't for the little ones.
The Woobie: Tina after The Reveal and Sess when Tina is saved by Soran when she goes into a Heroic BSOD while he, despite his best efforts, can't bring her to normality.