A mercenary for hire working for the empire. L'Arc is a stubborn swordsman who does what he wants to do. And once he is revealed to be a Child of Eesa, L'Arc has a hard time dealing with everything that's being forced on his shoulders. To make matters worse, his Childhood Friends become his sworn enemies, his Clingy Jealous Girl does a NASTY Face-Heel Turn, and he has almost no idea what to do but to look for a solution to solve everything. L'Arc's encounter with Ryfia is the first event that changes everything he has stood for.
The Dulcinea Effect: Averted, surprisingly. L'Arc initially refuses to take Ryfia to Jada as she's a stranger from the enemy country, despite it being her mother's dying wish. It's Alf who has to convince him.
The Exile: As he knows that Weiss wants him dead, he understands that he's no longer able to return to Diamant or his old life.
Extreme Doormat: A slight case, as he does do as he pleases—it's knowing what that is that he sometimes struggles with. Part of his Character Development is about him deciding for himself what he wants to do, rather than simply follow whatever Ryfia says regarding the Child of Eesa business or take orders from the military as he's used to.
Hero with Bad Publicity: After he unintentionally helps to destroy Antrax, the world hates him. Later on, when Alf makes him a wanted criminal, he's not welcome even in the Empire.
Heroic Sacrifice: In order to purify the Hozone, the party needs the power of the Singing Stone, but they also have to destroy the core as a result. But without the core, their objective would be pretty much impossible to achieve. Therefore, L'Arc is secretly instructed by Dr. Sonia to become the new core (as he's the only person left with the Eesa Factor), meaning he has to say goodbye. Don't worry though, he's only going to sleep. He wakes up 500 years later, his goal achieved, in the epilogue.
Take a Third Option: He ultimately decides to screw both Imaginal and Real, as both will doom humanity.
Tsundere: And very, very bad at hiding his dere side.
Turn the Other Cheek: He rarely holds a real grudge, despite the number of people who betray him/screw him over. Particularly notable with Weiss, whom L'Arc admits that he can't bring himself to hate, because even though he didn't know, L'Arc is Weiss's half-brother.
Wise Beyond Their Years: When offered the chance to take revenge on Rastan, the man who killed his father, he refuses because he states it will only continue the cycle of revenge.
A very naive young girl whom L'Arc finds wandering in the forest. Ryfia pretty much behaves like a young child as she has no idea what her words mean to others like saying she likes L'Arc a lot. This is one of the reasons Adele hates her guts so much. She happens to be a Diva meant to direct the Child of Eesa to offer Imaginal's Law to Eesa to help the world and its people. She doesn't really know the full extent of Imaginal's Law, though.
Action Girl: While she's geared more towards healing, she's still one of the best mages in the party.
Angst Coma: After getting hit with Ignacy's code conversion, the reason she stays unconscious seems to be because of this.
White Magician Girl: She initially has a level one water orb, and the only spells that provides are a healing spell and a water resist buff. Her first excel act is also used for healing. Plus, she equips staves.
The very good and benevolent second prince of the Empire and L'Arc's best friend. Alf worries too much about what goes with the Empire whenever it looks like it's trying to Take Over the World. As it turns out, he's a Child of Eesa like L'Arc. Once the Empire launches a surprise attack on Antrax, Alf defects from the group to fulfill his role by siding with Adele, considering L'Arc as his sworn enemy. His benevolence is thrown out the window just for the sake of proving Real that humanity can live without Ray for a year, though it greatly twists his old self.
Anti-Villain: Type III at first, as he's aiming to save the world using Real, before eventually shifting to Type II after Adele's death.
Big Brother Worship: A mild case, in that Alf's well aware of Weiss's many flaws, but still looks up to him and doesn't take kindly to people suggesting that he should be next in line over Weiss. This opinion sharply goes downhill after Antrax, however.
Crazy Jealous Guy: He has been hiding his feelings for Adele for a very long time now, but he acts a bit restless whenever her romantic partner L'Arc doesn't give her much respect. In case you haven't noticed, Alf has way too many scenes and skits worrying about Adele the most.
Deal with the Devil: He makes a pact with Real; that if he can prove humans can live without Ray for a year, Real will stop all Hozone pollution.
Foil: To L'Arc, in multiple ways. In terms of similarities, they're both swordsmen with similar stats and a Child of Eesa. In term of general differences...
For starters, whereas L'Arc is an 'uncivilized' Jerk with a Heart of Gold who's grown up trying to make ends meet, Alf is a refined Nice Guy who happens to be a prince.
Despite L'Arc possessing a temper and Alf typically being calmer, this gets reversed as time goes on, with L'Arc being much better at adapting and accepting trauma compared to Alf, who suffers from Break the Cutie. A short story also illustrates their differences in thinking: Alf is wary of what the future holds and so wishes for time to stop, whereas L'Arc accepts the passage of time and believes that it'll heal all wounds.
Family-wise, Weiss likes L'Arc but hates Alf.
Regarding what they intend to do as a Child of Eesa, they're on the reverse ends of the Order Versus Chaos spectrum. Both also choose to Take a Third Option, ironically doing the opposite of their supposed alignment.
Hammer Space: His sheath can hold swords much larger than itself. Just see that Giganto Sword fit into it!
My Rules Are Not Your Rules: In the first boss fight against him, he can summon multiple Rogress over a couple of turns. Hey, why can't we do that with L'Arc!?
Nice Guy: In contrast to L'Arc. If you've read the spoiler tropes, you know that this goes horribly wrong.
Order Versus Chaos: Opposite to L'Arc, he's Chaos, having chosen Real's Law. Just like L'Arc, though, this gets flipped, as his way of negotiating with Real involves him being a dictator for the Empire, putting him on the Order side of things.
Red Oni, Blue Oni: Somewhat subverted in that he's Blue for the most part, but has a few Red traits (namely when it comes to Adele. Eventually goes even farther into Red Oni territory, with L'Arc being more of a Blue Oni.
The most cowardly soldier of the entire empire, Niko is quick to flee during most dangerous situations though he still manages to be a loyal friend to L'Arc and company, having some undying admiration to L'Arc. It's beyond many people how he still works for the empire to these days.
Jerk with a Heart of Gold: He can be abrasive at times, such as his near Running Gag of walking into people and immediately acting like it's their fault—not to mention his bad habit of constantly ditching the party.
The Load: While he can be useful in battle due to his long-range attacks and high AP gain, his cowardly acts during cutscenes often end up with one of the team members getting hurt. L'Arc is pretty much at the end of his rope about it by the time he leaves the party.
Manchild: If the game didn't tell you, the player might not realize that he's actually older than L'Arc.
The Mole: His special pardon from the stockade involved him following L'Arc and telling Weiss and Freya what is going on. Overcome with guilt (which the team just assumed was him being a coward all the time), he left the team and joined the resistance.
Older Sidekick: Lampshaded when Alf comments that Niko's somewhat of a sidekick to L'Arc, who points out that Niko is older than he is.
Opt Out: After the events of Carbunculus and Leslie's sister Angie, Niko asks to go to the lightship, apologizing. The group is wary that he is ashamed of being a coward all the time though that might have been only part of it. By the time they get back, he leaves a letter saying he isn't cut out to help the group fighting Rogress and saving the world, and has returned to Diamant.
A very energetic girl who is a very skilled fighter despite her age. Cecille thinks of herself as a Hero of Justice, and she idolizes anyone in the world recognized as a master. She is Dynos' older twin sister. However, Dynos grew older than Cecille because he woke up from his magic-induced sleep earlier than she did, thus he aged first.
I Call Her "Vera": Yep, she named the 1000 year old lightship after herself: Cecille the Brave. That's even the name highlighted just before you click to get on making it official, replacing Old Lightship.
A mysterious man that helps the party to escape death. Serge is a man who only follows those who hire him to do anything regardless what the job might be. He turns out to be Leon but changed his name to forget about his troubled past. He has an ill sister that he loves with all his heart.
Anti-Villain: While with Alf's party. He has no real grudge towards L'Arc and co. and is merely working with Alf for his own goals.
Paper-Thin Disguise: Averted and justified. He's really "Lightning" Leon of the Lord Knights, but since you can count the number of people who know this on one hand he doesn't feel the need to conceal his identity.
Retired Badass: It's implied that he may have become this after the game, claiming that if no records are written about him in the future, he probably ended up living a peaceful life, plus the fact that he likely returned to Maria in Ebur after everything.
Rastan is a skilled swordsman who wanders the land seeking revenge for the death of his family. For some reason, he travels with L'Arc. That reason being his atonement for having killed L'Arc's father due to Ignacy's blackmailing him. Much later, L'Arc finally brings himself to pardon Rastan, welcoming him as a loyal friend.
Barrier Warrior: Comes with two Excel Acts that provide self protection status. He also starts out with Earth Magic (primary defensive buffs) and some of the weapons skills he unlocks in his swords lean towards this.
Cassandra Truth: Nobody believes him when he says he isn't the legendary Leon. He really, really isn't.
Noodle Incident: Nothing's ever stated clearly, but there is a serious dominatrix vibe to some of her conversations with Serge that makes one wonder just what they were doing during their time in Alf's party.
Ship Tease: Her flirting with Serge has led to this.
Sibling Triangle: In her backstory. She and her younger sister both fell in love with the same man.
Adele is one of L'Arc's childhood friends. She harbors shy but strong feelings for L'Arc, and everything goes down the toilet for her when Ryfia gets into the picture. She turns out to be the next Real's Diva, her mother having been killed moments before she got promoted.
Ax-Crazy: And how! The fact she has a few nice moments with L'Arc (like saving him from being crushed by a boulder) post Face-Heel Turn don't balance the rest of her bitchyness as the story progresses.
Jumping Off the Slippery Slope: She goes batshit insane when L'Arc summons Simmah to protect Ryfia Weiss from Girtab, assuming that it means he doesn't care about her. In her viewpoint, L'Arc would save Ryfia from an army of undead, but could care less if she got hit by a Rogress attack.
The Load: She isn't one, but some of her lines about how she can hold her own suggest that she's afraid of becoming this.
Manipulative Bitch: Sure, it was for revenge on Weiss for what happened at Antrax, but if she never had Dynos stir up confusion by having Undead Meridian Soldiers attacking Batrachites, the treaty would have gotten off without a hitch and the Meridian citizens wouldn't have the need to raise a rebellion.
A retired general in the Empire who is very fond of L'Arc and Alf. He is in charge of Jada. He eventually joins Alf in his quest to propose Real's Law to Eesa, but he feels that only L'Arc can make Alf change the error of his ways. That doesn't mean he'll disobey Alf for the better, though.
What Happened to the Mouse?: His fate remains unclear by the end of the game. The last we see of him is him helping to defeat Real with Alf.
AKA Deathchanter, Dynos roams the world looking for Real's Diva. He eventually finds the next Real's Diva (Adele) and decides to protect her. He's also Cecille's (age-wise) younger brother who got out of his sleep, resuming his aging earlier as a side-effect.
Anti-Villain: After Adele's death, once you learn about his backstory.
Bare-Fisted Monk: Worth mentioning is that he can't initiate combo attacks. This is balanced with the fact that he is equipped with some of the deadliest Arm Forces.
Berserk Button: Though one might not realize it until looking back, especially given that Dynos isn't the calmest of people to begin with, he really doesn't react well when Cecille claims that their father loved him more. Take aguess why.
Big Brother Instinct: The 'big' part is debatable, given the age confusion, and he definitely doesn't have this while alive, but his record in Allwise displays this towards Cecille, expressly asking the others to look after her.
Jerk with a Heart of Gold: Despite being quite the Jerk Ass, especially in the beginning, he does have some positive traits that mean Alf keeps him around in his party. The main one is his loyalty to Adele.
Bastard Bastard: Ayup. There's quite a few people who believe that he shouldn't be on the throne because he's a concubine's son, but his response to them is pretty much "Up yours".
Blessed with Suck / Cursed with Awesome: Sure, Eesa's Curse gave him a pretty cool wing that gives him a buffing Excel Act, but it was that same curse that was used on him when he tried saving his own mother. Not to mention it made his father, the other victim of the curse, deadly sick to the point of committing suicide. Okay, sure, the Meridian Bible that cursed him had been tampered with, but it's a bit harsh.
Cain and Abel: Given the personalities, you'd think Weiss would be the one that offs Alf, he even attempts so back at Antrax. However, in the end, he dies by Alf's hand. By that point, their roles in this have been switched; Weiss the fallen Abel, and Alf the traitorous Cain.
Easily Forgiven: Does the party forget that he tried to genocide the crap out of a religious order, in which there were bound to be lots of totally innocent people who didn't have ulterior motives? Apparently so.
Even Evil Has Standards: He agrees to a peace treaty. Considering how, until that point, he's expressed very strong imperialistic sentiments, it's something of a surprise to the party.
The Evil Prince: Let's see here... Invading a nation to kill their religious leader through a sneak attack with no formal declaration of war no less, manipulating his half-brother to help carry out said plan, fully intending to kill his other, younger half-brother after he (quite rightly) tried to stop him, taking pleasure in slaughter and conflict in general, being an unrepentant militaristic bastard... are we missing anything here?
He Who Fights Monsters: He spends a lot of time talking about how religious types are Manipulative Bastards and that he doesn't think their gods are much better. However, it's very clear to anybody who sees him that he's become exactly the kind of insane tyrant he believes himself to have been fighting against.
Hypocritical Heartwarming: It's A-OK for him to insult L'Arc, but when a senator of the Republic does it, Weiss is far from pleased.
Jerk with a Heart of Gold/Pet the Dog: While undeniably a Jerkass most of the time, he did have a bit of a soft spot for L'Arc in hindsight, in spite of what he put him through—Freya mentions that Weiss was actually worried about him the entire time, hence why he had Niko spy on him, and he may have intended to pass the torch to him all along.
Big Bad: Due to the story having multiple villains, it's not quite clear who's the real Big Bad of Arc Rise Fantasia. Ignacy's list of atrocities means that he's a more worthy candidate for the title than most, however.