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.
Shocking Swerve: Ys SEVEN pulls this off in spades once you reveal the real main villain of the piece... that is to say, Tia. All of a sudden, a lot of people you thought were enemies are now victims, several people you counted as friends are now out to kill you, and even the characters can't believe whatjust happened.
Tear Jerker: The ending. While Tia is fading away after her defeat, Maya shows up and speaks for the first time, telling Tia not to disappear. This is followed by Tia's final farewell to her.