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.
Game Breaker: Stacking enough ATK+999 or MAG+900 is enough to turn anyone into your best fighter or mage. Stack your entire party with them, and you can literally K.O. the final boss in one round.
The DLCs are very broken too, for example one of the DLC provides you with Gate of Heaven one of the most powerful scythe weapon and the other DLC pack gives you more than enough EP to fully enchances it.
Les Yay: Not quite but this reminds me of it so so much.
Deeth probably counts as this and Ho Yay, being a hermaphroditic god that flirts with Dyshana while appearing as a female and doesn't seem to mind Thoma trying the same toward her. He does this after she states that she probably should've shown up as a male.
Memetic Badass: Go on, just ask people who have played the game. Most of them would bow down to the greatness of The Rock.
As far as characters go, Reverie is one thanks to a bug. She's the only one who's able to wield the most powerful spear of the game.
Moment Of Awesome: Ever pull a 6 character combo on a boss before? Well its really, really Awesome once you use high level multi-hitting combos that chain into special attacks for the sweet sweet overkill message.
That One Level: Alzai Fen. Populated with enemies that are on the level of Goddamned Bats, some of them literal bats. And that's assuming you're not going for the Apostle of the Swamp title ASAP. Tree Spirit's intervention makes those Bats into Demonic Spiders.
Too Cool to Live: Every main protagonist except Rex. Even him need to be in the true ending route to survive.
This is actually a common misconception amongst players. Vashtor lost his memory after the battle with Leo in the first generation, so from the time where he meets Ladius (before the second generation starts) to the time where he regains his memories (about halfway through the fourth generation), he IS on your side. Even then, he will rejoin you in the fifth generation if you redeem him; between that and his backstory in ZERO, Vashtor himself can hardly be called evil.
Base Breaker: Linda is one of the most popular brides in the series in Japan, and yet gets quite a bit of hate in the US for being a Jerkass and forced as Sieghart's Love Interest.
No Fear EX Skill plus a really high vitality stat = almost no enemy can kill you at all. Pair it up with some Change HP Up+ and enemies might as well not even bother trying to kill you at all.
Hilarious in Hindsight: Kana Ueda voices the high elf Ellis in the first game. Fair enough. In Agarest 2 AnotherKana voices the high elf Fiona. And you can have them both in the same party. Too bad no combination attack with Ellis and Fiona.
Moral Event Horizon: Danaossprints with it. He was a pretty decent guy in the first generation (seeing as you don't do much in Graccea at that point), but once generation two starts rolling in, he tricks the party to do a long Fetch Quest for him, uses his daughter as a way to kill the party, drugs Luster to morph into a monster, kills Gideon just because he can, and kicks Melvina around whenever she fails her mission. All to summon Summerill at Aegisthus.
Nightmare Fuel: Eva's dream sequence where the darkness is invading her entire body. You could not help but scream tentacle rape with this CG.
Rasta's death. You will cry because he really didn't deserve any of this and that he had to die by Yumil's hand.
The Woobie: Chaos in a nutshell really. Let's see, he happens to be the leader of the dark gods who really just wants to be with Varna but Lenion gets to marry her first. Heartbroken, and being taken advantaged of Mobius to start the war, he gets defeated and sealed in the Zaint Luke pillar for a really long time.
That One Boss: Sophia and her golem is one in the third generation, but only if you were unprepared for the fact that you lose four party members in this fight and if you rely on them too much: Janus makes a Heroic Sacrifice, Fiona gets a Damsel in Distress moment, Eva is still recovering from a Heroic BSOD, and Sophia is the one you're fighting against. Needless to say, if you did not have a back up save, and a back up party to replace the four of them, you might as well restart the game. This battle is still considered as a Boss Rush too. What this means is that whatever HP you had from the last boss fight, your HP is still going to be the same in this fight.
Ellis's 2nd EX is healing all characters on the fields. The game-breaking part? It has 10 range, which means just connect your character with Ellis you can strike any enemies on the field.
Plum's 2nd EX Maiden Prayer has 100 SP recovery effect which means focus on raising her SP to 100 on the 1st turn, next turn use Maiden Prayer and hello EX Spam.
Growing the Beard: The game starts to really pick up in the third generation, with a greater emphasis on plot and character interaction, a more interesting environment, and the introduction of Thoma as a playable character. The fourth and fifth generations follow suit ad are generally very fun to play.
Moment Of Awesome: Thoma Raglen pulls off an awesome speech when an elf was badmouthing Lavinia due to discrimination. He then recites word for word as to why men should protect women, and that race has nothing to do with it. He leaves the arrogant elf speechless. Up until this point, Thoma is nothing more than just a funny guy who loves women.
Scrappy Level: The second generation is hated by many due to being incredibly similar to the first generation plot wise only with less memorable characters. Ladius is also seen as the most boring protagonist in the game.
Lavinia. Gets discriminated by high elves wherever she goes.
Winfield may be all about laughs, but if one takes the time to look at his character, he's an extremely broken man who experiences excruciating pain every moment of his life due to his cursed bracelet and will never be able to be with his beloved again. Some of his dialogue implies him to be a Death Seeker, which only makes things worse.
Jerkass Woobie: Duran may be a massive jerk, but you can't exactly blame him for hating a world that destined him to die before he was even born. None of his companions ever really take the time to talk to him about it, making him an even more miserable person.