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.
Anvilicious: Most of the Aesops are tolerable, but the one about America-as-Eagleland is just... over the top. To the point that Etranger even lampshades just how over the top it is.
Crazy Awesome: The nature of the suit itself. And in a very fast form of Fridge Brilliance, this makes perfect sense.'' How the hell else is a Hero supposed to be able to fight against the forces of evil as Disgaea conceives them?
Sign Of Courage. If this doesn't pump you up for the fight with your bizzaro family, or the final boss battle, nothing will.
Esoteric Happy Ending: Level-9 ends with the protagonist's family finally realizing that their son is a hero and that they've all been colossal jackasses to him. For the past eight years. The kid's been their personal Butt Monkey for over half his life; the idea that he could reconcile with them so easily, let alone learn the "True Power of Love" from the experience, seems painfully contrived.
Family-Unfriendly Aesop: The Troublemaker Hero's entire purpose is to drop these. The Bizarro Earthlings' problems in every level are caused by his meddling, "teaching them lessons" that end up ruining their lives until the Unlosing Ranger (temp) intervenes. As it turns out, he's Bizarro Earth's version of Darkdeath Evilman's giant robot, and his messed-up take on "heroism" is the result of his creator's poor impression of the heroes who failed to rescue him.
Game Breaker: Nothing really due to the restart at level 1 mechanic, but Cadaver spamnote equip an item that regenerates your EN based on enemies killed, and kill infinitely-respawning undead and the Tiger Dennote Recruit 10 employees in a Mastery Dungeon, your employees will now level up as you do more dungeons stand out. Leveled employees can allow you to do stuff like send back 3-4 items at a time, 9 times in a row, get a good collection of food from your home, or insure 6 items for free. Unlocking the den and figuring out how it causes levelups is a major point of the mid-late normal game and early postgame.
Or just using Shadowgrams. Also, a SERIOUS game-breaker is Unlosing Speed. It gives you extra turns based on your speed. If you've been using good parts and some chips...well, you can get about ten turns in a row, and FRAG the last boss.
Iron Woobie: The main character. Given a chance to be a superhero, he ends up becoming the No Respect Guy, getting his ass kicked over and over again, only gaining a name from himself because he's too stubborn to stay down.Then you realize what his home life is like — He did the same thing to save his sister from a serial killer, only to have her get amnesia from the sight, leading to it effectively destroying his family, having them turn on him, and them blaming him for everything that ever goes wrong with their lives.
Nightmare Fuel: The kidnapper that kidnapped Choco and the main character 8 years before the game was said to be a serial kidnapper, so this wasn't the first time he struck. He threatens to eat them alive. Think about that for awhile.
Scrappy Mechanic: If your power goes out or the game is otherwise turned off in the middle, the game treats it as you having died, meaning you lose all items and money on hand. This is to prevent save scumming (turning off the system and restarting from the last save) but does little to help if your PSP has a flakey battery, for example.
That One Boss: Although the game's already known for being a Nintendo HardGrindfest, Level-4's boss fight against Bizarro Prince Geo has gained the reputation as being the hardest story dungeon of the game.
The Untwist: Etranger is Super Baby. Given that Etranger is, effectively, wearing scaled up baby clothes, including the same clock-toy that Super Baby is...
Wake Up Call Boss: Bizzaro Geo, mentioned above. Prior to this, Boss battles consisted of pushing through a small army of mooks and then pounding down the Boss. Starting from Geo, a Puzzle Boss element is added. You now have to solve this puzzle BEFORE you can attack the boss(or expose and Attack Its Weak PointFor Massive Damage), all while still dealing with hordes of infinitely-spawning mooks, a level that is going to take much longer to solve than previous boss battles (meaning starvation becomes an issue), and a puzzle mechanic that injures you if you mess up.