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.
The Untwist: Alouette turning out to be the Maiden of Light and Croix turning out to be the Dark Prince. The game does such a poor job of keeping this a secret that in the LP archive let's play of the game, which depicts the plot as Prier telling a story of the game's events to the cast of the original Disgaea, Laharl figures it and tries to say it, but Prier stops him.
What an Idiot: In the good ending to the Demon Overlord Prier storyline, Noir tries to pick a fight with Prier and Croix, despite that Prier just showed that she was strong to PURIFY THE DARK PRINCE without killing him, and Croix still having all the powers he had as the Dark Prince.