Ogre Battle 64/YMMV

Complete Monster: Rhade. Where do you even begin with this guy? All the other villains in the story claim to do their deeds for the good of the kingdom/empire. But this guy pretty much does all he does because he can. From the first moment Magnus meets him, even though they're on the same side he condescends to him constantly, despite Magnus having saved his life earlier (Rhade actually complained about Magnus not being fast enough), and then kills an unarmed old man as soon as he leaves the room. Then he punches you out when you try to defend a rebel leader which begins the downfall of Yumil as Rhade's the one who shows him only power can change things. THEN he forces slaves from the west to be drafted into the war by holding their own families hostage, and saying that it's YOUR fault for dragging them into the war! Quite frankly, it feels awesome when you finally get to stick a sword in his gullet (or see it, depending on your alignment).
Game Breaker: The Item Duplication Glitch. It's a method that allows you to create up to 99 of any usable item. To which you can duplicate stat upgrade items, alignment upgrade items, even Champion Statuettes!
Goddamned Bats: Several:
- Grappers, as they hit hard no matter where in the formation they are, and always come in groups of 3 or 4. Thankfully, you only face them in a few levels and you can get one.
- Faeries and Gremlins, as they're Fragile Speedster incarnate and will dodge your attacks half the time. They only get real bad when paired with a healer at least.
- "Harassment Specialist" units tend to be this way: squads containing lots of status and debuff-casters like the above-mentioned gremlins, fairies and also witches. They're typically not dangerous in terms of damage but since they can put your soldiers to sleep, paralyze them or just decrease their attack power, they can often hold off superior forces (and when you consider that 'losing' a battle, even on technicality causes your unit to retreat back a ways, it can cause a lot of issues).
- Cockatrices can petrify you and the cure for that is not cheap. Also, on your side, it robs you of experience as petrified enemies don't give any. At least you can upgrade your Golems into Stone Golems thanks to them.
Good Bad Bugs:
- The previously mentioned Item Duplication Glitch.
- While the special character Meredia is intended to join at level 17, a glitch enables players to get her as low as level 3, allowing them to abuse stat-increase-upon-level-up items to shoot her INT up to ridiculous heights. If Meredia's trained this way, she can OHKO entire enemy groups by herself, possibly making her the most powerful unit in the game (at least when it comes to most damage done with a single attack) without using the Item Duplication Glitch.
Ho Yay: Any scene featuring Yumil and Magnus if full of this. Like Yumil asking Magnus to "become his knight".
It's Easy, So It Sucks: Not really "sucks", since many fans of the game love the amount of depth that can go into character customization and army management, and also like the battle system, music, and story. However, the enemy group design is very poor and never improves, so as the player gets access to better classes and weapons, the game becomes less and less challenging. It can be a bit of a letdown that your well-trained death army never truly gets a Worthy Opponent.
Magnificent Bastard: The Glendale brothers, but Baldwin tends to be more bastard and Richard is more magnificent.
Scrappy Mechanic: Chaos Frame and alignment, two linked traits. While CF is supposed to demonstrate the difference between responsible and vicious tactics, it's so obscure that virtually all players fail to realize the difference between "capturing" a town and "liberating" it is anything more than flavor text. Alignment, while actual visible to the player is absurdly difficult to control in any meaningful as well.
That One Boss: Amrius Dulmare is one of the few bosses in the game that's actually dangerous, casting a Pedra of Bane against you twice per combat.