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.
Angst? What Angst?: A lot of the times, the characters will get a little upset but move on rather quickly from the tragic, stressful events around them like discovering that your first love got gang raped to death, finding out your best friend turned into a mass murderer or Zaji dying. Justified in how the characters are constantly in danger and can't afford to dwell too much on the negative things.
Fan-Preferred Couple: If the forums of various sites are to be believed, then Akira/Rion is by far the most popular pairing, and for good reason, due to their willingness to protect and take care of each other, no matter what happens. Akira/Mami seems to be gaining popularity quickly, though.