Big Damn Hero - Due to the way most mission and quest fights take place, there's usually only something to fight when you get there to take care of the situation, usually just in time to help a given NPC.
Given that this is an MMORPG, being in the right place at the right time may provide you the opportunity to be this to another player, either by healing them when they're in trouble or helping out with the enemy they're fighting. (Note that they have to use a "Call for Help" function in order for the second to be possible.)
Hammerspace — Inventory items come in all shapes and sizes, but if you're not wearing them, they might as well be invisible and weightless. And then there's key items, which don't even take up inventory space, which is amazing since, for a certain quest, one of them is a whole cardian in need of repairs, and those are bigger than a taru.
Heroic Mime — Conversations are implied, but the only lines assigned to you are menu choices.
Kleptomaniac Hero — Due to the shared environment, this usually involves interacting with specific spots in the scenery, usually identified only with "???" - while it's safe to do so in towns and cities, in dungeons and outdoors, it may cause a notorious monster (or several) to spawn, depending on your quest and mission progress.
Fake Ultimate Hero - Although through no fault of his own — Zeid was the one that defeated the Shadow Lord in the war, but perhaps due to the tense relationships between humes and galkas, Volker was credited with the victory, though he's not comfortable with that and doesn't make the claim himself.
Twenty-Four-Hour Armor - Then again, we practically never see him in a relaxing situation where he'd actually take it off — that includes a secret meeting between high Bastokan officials in Wot G cutscenes, where even president Prien himself is always seen wearing armour.
Paper-Thin Disguise: He wears a gold version of his armor and just that. He makes absolutely no effort to hide his face in public, to the point of no one believing he really is the prince of San d'Oria because there's no way the prince of San d'Oria has that godawful disguise.
Sibling Rivalry: Trion and his younger brother Pieuje are often at odds with each other. The militant Trion always thinks with his sword, while the diplomatic Pieuje thinks that his brother is an idiot. Their rivalry is quite bitter as well; people of San d'Oria and their sister are actually wondering why they aren't killing each other yet.
Rebellious Spirit - Despite his responsibilities as a minister, he often goes out on his own to investigate issues which are taboo in Windurst, which gets him (and you) into some trouble.
The Ensemble Darkhorse that made her way to Dissidia. Shantotto's a Tarutaru Black Mage and a hero from the Great Crystal War. She's (in)famous for her rhyme-y speech and iconic laugh.
Appeal to Force: Her contribution in the Crystal War is basically this. She at first was fired from her position in the Ministry because she fought in a battle that she wasn't ordered to go to just for the sake of picking a fight with the Beastmen. She then basically said "Fuck you too" and led her loyal soldiers into an attack directly to the Shadow Lord's HQ, was winning, and gained intel that was vital in Shadow Lord's final defeat in the war. Nowadays, she's remembered as a hero, not as someone who disobeyed her superiors and Leeroy Jenkins her way to victory.
Paper-Thin Disguise: As Ambassador Karababa, and actually manages to have an even worse disguise than Trion. For Altana's sake, she only puts on a pair of glasses and calls it a day. Prishe subtly snarked at this.
Retired Badass: Her status is actually of a retired minister of the Orastery and veteran of the Crystal War.
Rhymes on a Dime: Her way of speaking is full of this, a chance for a rhyme she'll never miss.
Sociopathic Hero — While certainly an asset to her nation, especially during the war, her default treatment of everyone isn't pleasant - just ask the journalist outside her house who, during a quest line, ends up on the receiving side of a curse.
She does have standards though. She can be quite loyal if she finds a cause she feels is worthy, and will leave without a moments hesitation if said cause could have a negative effect on the overall populace (or... uh, if she has nothing to gain from it).
The Battle Didn't Count: In the optional Heroine's Combat, if Shantotto is fought and defeated, her defeated pose reveals that "Shantotto" was actually a magically controlled doll under Shantotto's control.
The Chains of Commanding: She sent her Star-Crossed Lovers Karaha-Baruha into a suicide mission because the council was desperate to drive the Beastmen out from Windurst. Before he went out to summon Fenrir in a Heroic Sacrifice, Star Sibyl fell to her knees and started crying in Karaha's embrace.
Only Known by Their Nickname: Star Sibyl is the title of Windurst's prophetic leader. Her real name hasn't been revealed. Note that, consistent with the term for an ancient Greek prophetess, the y comes second.
Rapunzel Hair: For a Tarutaru standard, though. Her hair is almost larger than she is.
Waif Prophet: Subverted in that she secretly lost her ability to see the future twenty years before the game's story begins. Her first gaze into the future revealed the imminent and complete destruction of her nation and prompted her to feed false information to her people. Though this devastation did occur, time travel created a new version of history in which it was averted at the cost of the Sibyl's powers. From her perspective, therefore, she has never correctly seen the future. That she continues to offer prophecies to the public ultimately makes her more of a false prophet.
The creator-goddess of Vana'diel. According to legend, she created a race called the Zilart, but after they destroyed themselves through their own hubris, she shed five tears that created the five Enlightened Races of Vana'diel.
Uncanny Valley: Invoked. They were created with the same substance Altana created the Enlightened Races from. The thing is, they don't have souls and only do what they are programmed to do. When the players finally have a chance to fight them, they are very unsettling in more than one way.
The brother of Archduke Kam'lanaut. One of the last Zilart nobles in existence, his botched attempt to open the Gates Of The Gods led to the destruction of his race. He and his brother were frozen in stasis, only to be inadvertently reawoken centuries later by Raogrimm. He is actually the elder of the two brothers, but his body was frozen in time after being exposed to one of the Mothercrystals.Eald'narche is the final boss of the Rise of the Zilart expansion, as he continues his insane vision to open the Gate of the Gods.
Big Bad: Of the Expansion and arguably the game's main storyline.
Eyepatch of Power: Notable because he uses it to cover his crystallized left eye that he got in an accident which made him stuck in the body of a child forever. Subverted because in his Final Boss battle, he throws said eyepatch away and is clearly stronger that way.
Flunky Boss: He hides behind his exoplates and orbitals in the first battle with him.
The current Archduke of Jeuno. A powerful and respected leader who united the four warring nations of Vana'diel against the Shadowlord's army during the Crystal War. In truth, he is a Zilart prince and one of the last few remaining Zilart in existence. Together with his younger brother Eald'narche, they resume their centuries-old plot to open the Gate of the Gods.
Older than They Look: And from an in-game newspaper, it seems like the entire Jeuno knows that Kam'lanaut and his brother are older then they appear because they look exactly like that since 50 years ago, yet they doesn't say anything about it.
The adopted daughter of Gilgamesh. Lion spends most of her time investigating the true cause of the Crystal War, eventually discovering the existence of the Mothercrystals that each Beastman race protects and the Zilart's role in manipulating Vana'diel to gain control over them. She eventually sacrifices herself to stop Eald'narche from destroying Vana'diel in an act of petty revenge.
And I Must Scream: Her fate in Abyssea. When the final battle against Promathia went wrong, Promathia absorbed the (Abyssea-verse) Player Character and Selh'teus, transforming into Shinryu. The only thing that prevented Prishe from meeting the same fate was her immortality, but Shinryu's influence on Al'taieu was so strong that even if there were any survivors, they would never be able to leave. So there she is, sitting cross-legged in Empyreal Paradox alone, with only constant promises and visits from the Player Character keeping her sane.
The Nicknamer: Notice that she almost never calls people by name unless she knows them for a long time or she considers them as friends? She even persistently calls the player "Dead Guy/Lady" after finding the player unconscious in some hill and only stopping when s/he saves her from the Sin Hunters.
Half-Human Hybrid - Although there are a few cases of hume and elvaan NPCs in relationships (and even one married Galka), she's the only one we ever see with mixed heritage. Might be justified by the fact that at some points Bastok (humes) and San d'Oria (elvaans) were at war.
Tsundere: Lilisette shows signs of being a Type A, to the point that her stage name of "Moonshade Butterfly" is warped into "Moonshade Wolverine" by her troupe-mates for how she treats men until she meets your character.