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.
Narm: Nearly every character or dungeon, no matter how minor or irrelevant to the overall plot, has a needlessly "tragic" backstory. In many cases, this backstory is the only actual character trait they ever receive.
That One Level: Gladius Towers, a pair of huge eight-floored towers with confusing overlapping layout, lots of dead ends and switching to the other tower every few floors. Then you'll go back and goes through the other tower from the beginning. It'll take some time.
The Untwist: Just about every character can be described as having some dark secret that is easily guessed the first time it's hinted at.
Whatever happened to the conflict between Longardia and Draxil after Chapter 5?
They build up Seed to be this awesome and eventually tragic villain, but then he just gets beaten and thrown aside. We end up with a last minute "Mother" of Rune and a Valkog/Battleship chimera for a final boss. If only they'd kept him around as a Final Boss...