As the four characters met in the Tinkerer/Academic quest chain are implied to be the canonical player characters, this page will refer to them by their names from said quest chain.The characters have tropes specific to them, as well as those that apply to their entire group. This is for the latter.
An adventurer training to follow in the footsteps of his father, the warrior attempts to rescue a girl of Ironwood Village from attacking monsters. Little does he know, she's no ordinary girl, and his fateful journey has only just begun...He can become either a Mercenary (and later a Barbarian or Destroyer) or a Sword Master (and later a Lunar Knight/Moon Lord or Gladiator).
It's still murderous in PvP if you're dumb or unlucky enough to get caught in it.
Parry Stance (100% parry chance — read: invincibility) also qualifies especially when paired with Counter Slash or Counter Wave. The Lunar Knight's Flash Stance is even better, allowing him to barrage enemies with Sword Beams.
Disappeared Dad: Trying to find him is the reason the Warrior initially sets out.
No Sell: The Warrior's Highlander ability negates all damage for up to one minute when an affected character has a single hit point remaining while the Mercenary's Iron Skin resists most debilitating Standard Status Effects.
Stuff Blowing Up: The Mercenary's specialty, with multiple skills that cause massive explosions and one that produces a grenade from thin air.
Sword Beam: Sword Master's Magic Skill tree has these. The Lunar Knight/Moon Lord elevates the trope to an art form.
Sword Plant: The Warrior has this pose during the character creation screen.
The Archer (Triana)
An elf learning her place in the world, she too sets out from Ironwood Village to rescue the red-haired girl. As she travels, she undergoes her telezia, a process by which she learns her destiny, which is tied to the destiny of the Prophet herself...She can become either a Sharpshooter (and later a Sniper or Warden/Artillery) or an Acrobat (and later a Windwalker or Tempest).
Automatic Crossbows: The Archer's crossbow acts for all intents and purposes like a three-round-burst submachine gun.
Multishot: Go on, guess which skill! It's Multi Shot.
Not Quite Flight: The Windwalker is capable of leaping high distances, and can extend her air time indefinitely (with practice) while the Showtime! buff is active.
Rain of Arrows: One of the Sharpshooter's skills is a one-elf version of this.
The Cleric (Edan)
A young member of the Divine Order, sent to Mana Ridge to guard the Sage's Staff. It is soon stolen by Dragon Cultists, and as he sets out to retrieve it, he discovers that someone he knows may not be who he appears... After discovering that his close friend is actually a Dragon Cultist, he leaves the Divine Order so that he can protect the Prophet from anyone who would try to abuse her power, without allegiances to any side or organisation getting in the way.He can become either a Priest (and later a Saint or Inquisitor) or a Paladin (and later a Crusader or Guardian).
Reverse Grip: The Cleric does this during his turn animation with his mace in the character creation screen.
Shield Bash: One the the cleric's first skills is this, with the Mace and Wand having a Shield Bash in their normal attacks. The Paladin can also perform this as a Counter Attack after blocking an attack.
Shock and Awe: The cleric has a few skills that do this, especially after getting his third class.
The Paladin: ...Yeah, if you can't figure it out, we're not gonna tell you.
White Mage: One of the ways the priest can be played, focusing more on buffs & heals than on his relics.
The Turret Master: The priest has access to a few relics, which he can use to support the party.
The Sorceress (Angelica)
Once a member of the Astral Coven, she left to see the world, and ended up gambling her money away. Retreating back to her former home to escape her debts, she stumbles upon a cleric caravan under attack by monsters. By saving them, she is drawn into a nefarious plot that could change the future of the world...She can become either an Elementalist/Elemental Lord (and later a Pyromancer/Saleana or Ice Witch/Elestra) or a Mystic/Force User (and later a War Mage/Smasher or Chaos Mage/Majesty).
Trapped by Gambling Debts: She uses her scholarship to gamble in hope of getting more money for her poor family, and she failed.
The Academic/Tinkerer (Camelia/Commelina) (XD-26)
Sent back in time to stop a rogue automaton known as Apocalypse and save her future, she emerges from her time machine to find herself deaged into a twelve-year-old girl. As she looks for a way to save her time, she keeps running into four legendary adventurers, and becomes drawn into their quest despite her attempts to keep herself away. In saving the future, will she become a legend herself...? After finding another girl that looks exactly like her, she discovers her true origin and Jasmine's true intention of sending her back to time.She can become either an Alchemist (and later an Adept or Physician) or an Engineer (and later a Gear Master or Shooting Star).
Artificial Human: She was created by Jasmine using a jewel with mysterious power. The jewel was split into 30 fragments and implanted into 30 clones of herself. She was one of the test-clone with short life-span.
The Kali was born on the same day as Rose and raised in secret as another destiny girl by Sage Arno. Her adventure starts when her hometown is destroyed and all the residents killed by Lambert, including her master Gaharam. Being the sole survivor of the village, she summons Gaharam's soul to find out what happened and ends up being entrusted the mission to find and protect the Prophet in Prairie Town where the Star of Destiny appeared.
A young woman attacked by minions during the warrior/archer tutorial, she is rescued by the player. A descendent of the ancients known as the Prophet, she is wanted by practically every villain for their own nefarious purposes.
A mysterious woman in red (but not a Lady in Red) who opposes the Black Knight, the player encounters her early in the story. She saves the player after the Black Knight either kills or gravely injures him/her, and attempts to prevent him from unlocking the power of the Ancients (but fails). It is later revealed that she is a dragon, and is using most of her power to hold the world together.
Badass: Is capable of powerful healing magic and holding her own against the Black Knight, although he eventually wins. It is later revealed that most of her power is used to keep the world together, implying that she could easily curb-stomp him if not for that.
Barrier Maiden: She devotes most of her power to holding the world together. She's still almost a match for the Black Knight.
Big Eater: She is always hungry and she is always angry about being hungry. The majority of the quests she gives until you get to Saint's Haven are to fetch her numerous edibles and remedies for her to snarf down in one fistful while your character watches in horror at how fast she can eat it. She guzzles ten bottles of booze in one sitting and then complains that you took too long to get so little.
A one-eyed Master Swordsman with the same name as one of the legendary heroes, and an ally of Argenta. It is eventually revealed that he is the legendary hero Gerrant, not just someone named after him.And also that he, too, is a dragon.
Humans Are Special: He desired to be among humans and learn about them, unlike his present self who speaks despicably about them.
However, it's implied to be just a facade as result of the events at the end of the Black Dragon Raid. He doesn't hesitate to sacrifice himself to save the Player. Argenta and the new Geraint point out how he forgot about his duty and how stupid it was from him to die protecting a human.
An Apostle of the Dragon Cultists, who kidnaps the Prophet in order to use her power. Things get complicated when you learn that he's actually betrayed the Dragon Cultists, and is now working against them.
Wild Card: Originally joined Geraint's team as The Mole. But after befriending Geraint and promising to protect him, he seems to have turned into Reverse Mole, making his alignment hard to determinate.
Don't You Dare Pity Me!: He tells the Player to stop pretending they are able to understand him, right after they ask why he never cleared his misunderstandings with Geraint.
Declarationof Protection: To Geraint. Argenta as well to some degree, though he forgot her name while making the deal...
False Friend: He believes Geraint used him and the army to obtain the Black Dragon Jewel. Being hurt by his betrayal, Velskud attacked Geraint damaging his right eye.
To make things confusing, Geraint thinks Velskud attacked him to steal the Black Dragon Jewel from him to give to his Master, when at that time he was only trying to get Geraint to explain why he lied to him.
My Greatest Second Chance: In the future he asked Jasmine to let him go to the past for a second chance to save Geraint. However he was denied with the excuse that his past and present self couldn't coexists.
No Brows: He has eyebrows only in the Japanese localization.
The young king's guardian and uncle, he is at first glance simply an arrogant man who seeks glory for himself and the king, and believes that the ideal king would rule with a mix of love and fear, mostly fear. However, underneath it all, he desires what's best for the kingdom, despite not always showing it.
An NPC in Saint's Haven who helps jump event characters (basically, free Lv.45 characters given out in an event) acclimate to the world of Altera, she serves to explain how to play the game to the player. ...In conversations with the player's character, who thinks she is completely and utterly insane.
A Dark Elf who ran away from her land, you meet her in Port Hermalte. She's actually next in line for the Dark Elf throne, and comes to power after her sister Elena is... removed. Her quest chain involves playing games with her, then helping her quell a rebellion against her once she reveals her royal lineage.
Break the Cutie: The rebellion against her, and the ensuing loss of dark elf life, does a number on her.
Dark Is Not Evil: Despite her Dark Elf heritage, she's one of the nicest NPCs you'll ever meet.
A powerful sorcerer who appears in seemingly unrelated quests at first. He eventually reveals himself to be an Apostle of the Dragon Cultists, and the former sole male heir of the Astral Coven, who was banished for his power-hungry ambition. He's also Kasarana's older brother. During the events of Lotus Marsh, he attains his ultimate goal: to obtain the power of a dragon. He's the boss of Green Dragon Nest.