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.
Draco in Leather Pants: Mewt Randell and the Li-Grim. Neither is necessarily evil, but they qualify in a sense due to people seeing them as more sympathetic as they are, especially considering that Mewt is mainly selfish and willing to make the laws harsher against his subjects' wishes on a whim.
Esoteric Happy Ending: Yeah, Mewt's no longer nuts, but you're still a cripple, Doned. Ha ha ha ha.
Fridge Horror: The scene where the real world transforms into Ivalice includes random bystanders turning into monsters. That's right, the main characters might be better off in this wonderful fantasy world, but there are plenty of other people who now exist to be beaten up over and over until they either die in a Jagd or are captured and sold into slavery.
Note also that "Lost Souls" you fight the first time you save Professor Auggie have the same names as the bullies who picked on Mewt in the beginning . . .
Also, the "Fire! Fire!" mission, involving the player having to stop a group of Bombs from burning down a neighborhood, with the implication that if you fail, the judge watching over the fight won't do a damn thing to stop the arsonists.
Game Breaker: Concentrate breaks most skills clean in half, since low accuracy is what keeps them balanced, and three races can learn it. Double Sword is also fairly ridiculous, but that's Human-only. Doublecast is terrifying when you consider that it works on Summoner abilities - yes, including Madeen.
The only thing worse than the above skills is using them with other classes' moves. A ninja with two swords? Unnerving. A paladin wielding two swords, both of which are insanely powerful? Scary. A paladin wielding two of the aformentioned swords and toting Ultima Shot, arguably the most powerful human spell in the game? Freaking terrifying.
Ultima Blow is unnecessary if you get Sonic Boom, which deals normal damage to multiple enemies at a nice range. Paladins are also capable of equipping a combination of equipment - Nagrarok, Sequence, Peytral, and Ninja Tabi - that allows them to have a total movement range of eight squares, over twice what they ordinarily have and more than enough to cover half a map by themselves. In combination, this gives them the same attack range as a Gunner.
Also, equipping a Bangaa Dragoon (highest attack base stat and growth in the game) with the Gladiator's Ultima Sword (triple attck damage) and the Templar's Weapon Atk+ (guess) can kill litterally anything. Yes, even the Stone Wall Toughskins. Even the 999 defense Flans. It is even possible to one-shot the final boss with this.
Raising a Gunner as a Mog Knight gives you access to Ultima Charge from across the screen. If it's not possible to scrounge up the MP for that, you can also spam Stopshot or Charmshot, which disable any enemies they don't outright kill. Add Counter and you have a killing machine.
Steal: Ability, intended as a late game accelerator pedal, can be acquired with a couple of hours of cheesing, turning it into a Disc One Nuke for both Humans and Moogles. This frees munchkins from having to waste time learning abilities and lets them move straight into stat optimization.
Goddamned Bats: Sprites/Titanias (particularly those with White Wind), enemy Gunners or Illusionists (who can hit you from far away), and anything equipped with Damage > MP. The latter ability results in damage reducing the target's MP instead of HP, and, worst of all, as long as the target has any MP, they will not lose HP.
They Changed It, Now It Sucks: Many of a Tactics' fans outcry when they saw Advance. Most complaints lie in the storyline for being too childish.
On the other hand, Electronic Gaming Monthly, nominating the game as a good holiday gift, notes that "the plot actually makes some damn sense this time."
If you think Marche is the Villain Protagonist because he wants to remove what's making everyone happy. (Especially Doned!) and would be committing genocide against Ivalice. However...
Marche may also see this as a Lotus-Eater Machine simply because in order to make four kids happy, the entire town of St. Ivalice essentially ceases to exist
Tastes Like Diabetes: Every moogle except for the Moogle Knight, who had a low voice.
The Woobie: Doned. Despite that he acts like such a little shit, his wish was simply to be able to walk and not be ill. And in the ending, he goes back to being an Ill Boy in a wheelchair. Despite getting friends, come on...