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.
Alt-itis: Some players (usually the less frugal ones) may fall under this, especially if they create extra characters for the following reasons.
Extra inventory space when the extra bank space provided by premium service.
Event item farming for non-repeatable quests.
To dress-up and look pretty. However, this is not as common as it is in other MMORPGs, as the creation of a new character costs money. Those people are there, though.
If one counts the player-controllable pets, then the amount is almost innumerable; they are bought for various reasons such as their usefulness toward their actual humanoid characters, their appealing appearances, or... for their extra inventory space (see above).
Alternative Character Interpretation: Cichol? Yeah, he's the closest thing to "a goodguy" the world has. In fact, it's even canon that Morrighan was the one to screw up the Soul Stream in the first place, which prompts Cichol to take it upon himself to fix everything... no matter what it takes. Later on in the game's storyline, you actually manage to fix the Soul Stream yourself, whereupon Cichol promptly gets out of your face.
Angst? What Angst?: Poor Nao would have a lot to cry about, but is normally cheerful unless painful events in her past are directly brought up.
Though her pathetic...ness is slightly lessened by the fact that Tabhartas is a real challenge.
Breather Level: A whole Breather Campaign! G12 is considerably easier than G11, though not without difficulty. In particular, where G11 was stuffed full of Marathon Levels, G12's missions tend to be short and decisive.
Demonic Spiders: There are many of these, including Goblin Archers and just about anything that attacks in groups.
The black ship rats in Rundal... I hate you so....
Imps for earlier players. They're so bad that a later-released species of enemies complain about them.
Light Gargoyles for new players in Generation 1's Albey Dungeon, assuming their two partymates aren't totally overleveled. The fact that the dungeon forbids all but one form of revival adds to the frustration with them.
If you've ever done G11 or the Ghost of Partholon Shadow Mission, you'll remember the Blinkers. They're completely immune to knockback (in a game where stun is the best way to dispose of an opponent) and their main attack is to fly out of harm's way and rapidly sap the HP out of you.
Ghasts are actually the toughest foes in the game. They have a good 15,000 hit points each, soak up the first 300 points of damage dealt to them, and don't flinch from any attack whatsoever. They also spawn in packs of six. The only real way to defeat them is to surround them with Windmill attacks while mages bombard them with high-level Fireball and Thunder spells. And then there's Shock, which one would think would be the perfect counter to them... except that it completely ignores Ghasts for some strange reason.
Unknown Men give Ghasts a run for their money, and exhibit a very simple combination of abilities that make them one of the dangerous regular enemies in the game. They have the aforementioned complete stun immunity, they dual wield swords, they have Final Hit and love to spam it, (naturally, their version lacks Final Hit's four minute minimum cooldown), they have extremely wide and very persistent multi aggro, and high damage and high hp to top it off. If two or more of them gang up on you and start spamming Final Hit, you will die, and there won't be a thing you can do to stop it, no matter how many Rank 1 skills you have. As of this writing, the only saving grace about facing them in the missions they appear in, is that there are usually NPCs aiding you that can take the heat off.
Flanderization: Ruairi had always been somewhat prone to rash decisions, but even when he pulled a short-lived Face-Heel Turn in G3 he implied he had some ulterior motive behind his actions. G18 sees him go completely off the deep end after learning of Triona's death.
Fridge Horror: All Elves eventually become Desert Ghosts. Portia will too. What will happen between her and Bassanio when she does...>
Goddamn Bats: Enemies that appear in swarms, especially if some Archers are thrown in the mix. Made worse if these enemies exhibit multiaggro behavior.
Overall subverted by the bats themselves. They have less HP than you might expect from their combat power.
Bandits. They spawn all over while trading in the form of Inescapable Ambush if you come too close to them on the field, and can appear in groups of up to eight. Two of them will do their damndest to keep you busy (and god help you if it's the local archers or mages that do it) while the rest beeline to steal your trade goods. In some areas you can't go more than five steps without tripping over them.
Hilarious in Hindsight: Nao used to be jealous of other girls who "matured" (read:grew breasts) faster than she did. She certainly matured since then. Doubly so, since she's actually sensitive now about the size of her breasts.
Lugh Lavada's plan during G16 is just full of magnificent bastardry. He uses Shakespeare as his pawn to kill the king, casting doubt on Milletians, and then has Bella mind control the court into accepting him over Eirawen as the successor.
Memetic Mutation: In a more meta sense, the aptly-named "Mohawk Guy" in the background during one of Mabinogi's videos which showed their actual office environment.
Play the Game, Skip the Story: This is not as universal as most examples of the trope, but a portion of the player base does think like this. A common story involves a party leader wanting to watch the storyline cutscenes while being pestered by party members to skip.
Tarlach is frequently spoken to for Generations one and three, but you can't speak to him while he's a Bear. The frequent result of this is sitting around and waiting until Night to fall.
A majority of the content from Chapter 4 tends to get this treatment, particularly the mainstream storyline missions. Reenacting scenes from Shakespearean plays many have probably already read as School Study Media (i.e. Romeo and Juliet and Hamlet) was considered by some to be boring and tedious storywise and mechanics-wise. The last two generations of the chapter involving The Merchant of Venice and Macbeth are generally perceived as a step up from the previous two in both respects due to breaking away from the Theatre Mission format and only using their respective plays as a framework for the game's story.
“Stop Having Fun” Guys: The players dueling in front of the Healer's House in Dunbarton are very serious about their game. Fortunately, you can just ignore them and go about your business.
Python Knight's "Shadow Death" move is a One-Hit Kill, and the player can only block it by using an item in their inventory at the exact right time. This has to be done successfully three times in order to move on to the next phase of the battle
Glas Ghaibhleann, whose lightning-fast regeneration rate forces you to throw your standard strategies out the window and focus on wounding him instead. The seal scrolls help, but nowhere near enough.
That One Level: Baol Dungeon in G3. The first time time you run through it, it combines Useless Useful Stealth with Demonic Spiders with Luck-Based Mission. The second time through, it's a five-floor complex that contains the toughest foes in the game that a character of that level couldn't possibly fight. Of course, they can bring experienced players along, but who wants to go through a two-and-a-half hour dungeon without any promise of a reward? The former is totally averted if you stock a good amount of Ice Mines, or have the ability to go Demigod to throw Spears of Light at your enemies, or have a extremely high level in Golem Summoning.
Generation 11. Or, specifically (since most of the time you can rope in a Royal Alchemist to help), a small piece of hell called "Buchanan inside the Castle". You are sent in to check on the status of librarian Buchanan. To "help" you, you are provided with "assistance" from Leymore and Cai, supposedly the best alchemists around, except they have an extremely suicidal AI and their skills are generally not enough to go up to par with the poor attempt at Dynamic Difficulty Shadow Missions give you, since the exponential increase in enemy stats is far more than the Empty Levels you have, turning this into an Escort Mission; one of them dies and you fail the mission. The mission has White Orbs, which basically serve to continue spawning enemies at ridiculous rates before you can deactivate the switches. You also can't bring in a Royal Alchemist to help, and the "suggested" way to beat it according to most players is to actually wait out the time for transformations, making this mission hit at least four hours. You can't bring Royal Alchemists on, either. And Buchanan turns out to be fine anyway, ruining any plot-based pride you might have gotten.
Before Generation 1 was reworked, its final act was brutal. First you needed to run a specific version of Barri Dungeon- only accessible on real-life Saturdays- to find the gate from Errin to Tir Na Nog. Once there, you had to kill 50 zombies to bind in Tir Na Nog. Zombies are Goddamn Bats in Mabinogi since they can only be hurt by Windmill and will beat you bloody if you slip up. Next you run four dungeons in Tir Na Nog to get the Black Orb, and then run the Orb's dungeon to get the Goddess Pendant. Fail in the Orb dungeon, and you have to redo the last four dungeons to get the Orb again. The pendant opens up a triple-length dungeon with five boss rooms that leads you to the Goddess Pass. Finally, use the pass, and you go to fight Glas Ghaibhleann. The worst part? The only way to rez in Tir Na Nog is to get a Pheonix Feather from a party member. So if you wipe on any dungeon, or die while trying to solo it, you have to start that particular dungeon all over again. And if you skipped the 50 zombies quest, wiping gets you kicked all the way back to Errin and you have to wait until next Saturday to pick up where you left off.
That One Sidequest: You could use Shock anytime after getting it in the G11 storyline, but if you want to level it beyond Novice rank, you will have to collect all ten pages of its skill book. All ten pages are Randomly Drops from bosses or rewards from Shadow Missions - and the percentage for the drops can be as low as 0.86%.
This is true for any collection book quest, besides maybe Thunder and Paladin Passive Defense; buying pages often go for 2-3 million gold.
Generation 15 has made the Shock collection quest somewhat easier, with the three hardest pages (1, 2, and 10) now able to drop from field monsters with 'the Ancient' title.
Users generally use this every time Nexon releases any update; while many of them are justified, as updates often come with a new set of glitches or a need to re-train, it can get to ridiculous levels.
What an Idiot: Shakespeare's plan to kill the winged Goddess? Knock her off a building. Even if he was actually attacking Morrighan and not the King, it's highly doubtful that his plan would have worked.
Woolseyism: While the early translation (before G9) fell into "Blind Idiot" Translation, the later generations have a much better thought out translation. For example, the Beepers in the original version became Blinkers, and the G11 script contained references to memes the NA community has. However, the script still has quite a few typoes.