Holy Hand Grenade: The Bright Shield Rune's level 2 and level 4 spells. The latter, called Forgiver Sign, which is unlockable by getting all108 recruits, deals the most damage to a single target when your whole party has full HP.
10-Minute Retirement: At one point, Nanami tries to convince him to run away from his responsibilities. Accepting leads to a 10-Minute Retirement, after which the other characters catch up and try to convince him to be their leader again. Refusing here turns the temporary retirement into a permanent one, however.
Running away will also lead the storyline to one of the Stars of Destiny, Ridley Wizen, being killed off-screen and later being replaced by his son. However, if you refuse to run away, Ridley will live.
William Telling: He participates in a traveling circus' show by having various pieces of fruit placed on his head while knife-thrower Eilie impales them with expert precision. You can throw off her aim and get hit with a knife yourself by choosing to wimp out and move to either side before she throws.
Crowning Moment of Funny: Sometimes, she lets the hero handle it himself and is seen casually reading a book, singing to herself and having a picnic. Not bad since it heals 10% of her HP and gives you the chance to do the Combination Attack again.
Conveniently an Orphan: She and the hero had been left orphaned by previous wars and were adopted by a hero named Genkaku.
Cool Big Sis: Despite not being related, she acts like this to the hero.
Player Punch: Arguably one of the most upsetting examples in videogames, mostly because it happens quite late on in the game when the player/character relationaship is strong, and also because she's the mouthpiece for the (silent) hero, until the inevitable happens.
Plucky Girl: She's arguably one of the bravest of all the Suikoden characters.
The Pollyanna: She almost always remains positive for the hero's sake, despite the hardships they must face.
Short Tank: To most of the other characters. Viktor especially, who calls her a "pug-nosed tomboy".
10-Minute Retirement: She can convinces the Hero to flee with her during the Tinto incident, if you choose the right answers during a dialogue with her. Eventually, others characters will catch up and try to convince them to come back.
Et Tu, Brute?: His betrayal of the hero and Nanami. However, it is revealed to be a False Flag Operation and he decided to destroy Highland from within after witnessing the power of Luca Blight. The hero and Nanami are completely oblivious to this plan.
Not so much that they're oblivious. They catch on eventually and even conspire with Jowy to kill Luca Blight. What makes this troupe really stick though is that Jowy decides that peace will never come between Highland and Jowston because the two countries hate each other so much, and he invites Riou and Nanami to a fake peace treaty signing with the purpose of taking them hostage and forcing the City-State to surrender. The only thing that saved Riou and Nanami then was that Shu planned ahead and used Pilika as a meat shield to get them out of there. Because of this, the war continues regardless and both countries end up being absorbed into each other as the Dunan Republic.
The Mole: Jowy joins Luca Blight, believing he can work from within to bring about a better future. Jowy eventually becomes a general in Highland, marries Jillia Blight, and secretly plots against Luca with Leon Silverberg.
Parental Abandonment: His step-father throws him out of the Atreides house and his mother will not intervene.
Break the Cutie: Following the tragic events at Toto, where her parents killed by Luca Blight. Then, after being rescued, she gets to watch as Luca Blight kills a completely helpless soldier for her viewing pleasure, and is only prevented from killing her by timely heroic intervention.
Dumb Struck: In reaction to the above events, she is no longer able to speak.
Badass Normal: Even moreso when you consider that while magic is commonplace, Luca has only a sword, heavy armor and a mere Fire Rune which he uses in conjunction with his attacks. And he's still one of the most terrifying beings in the entire series.
Determinator: His unwillingness to die after absurd amounts of pain is insane.
Pain, nothing! His unwillingness to die after absurd amounts of mortal injury is insane.
Battle Theme Music: He gets one of the famous Suikoden II one-shot (well, technically three-shot) battle themes for himself, entitled "The Chase": 
Difficulty Spike: To actually have a chance of taking him on requires an unforeseeable amount of levelling up and equipping of 18 individual characters, and even when that's done, he still provides a steep jump in terms of difficulty.
Even Bad Men Love Their Mamas: His sister Jillia is the only person he will hold an equal discourse with. Although it is actually revealed in the Gaiden game that the only reason Luca tolerates Jillia is because of her strong resemblance to their late mother.
That One Boss: In gameplay as well as in-universe. Gameplay wise, you have to buff up the Main Character's party and hopefully equipped yourself with some fire-reducing equipment. In-universe, it takes how many hundreds of arrows, three groups of six of the strongest members per group, even more arrows and finally a duel between the hero himself.
Luca Blight: It took hundreds to kill me, but I killed humans by the thousands!!!! Look at me!!!! I am sublime!!! I am the true face of evil!!!
You Have Failed Me: Luca beheads one of his generals (whose previous record was sterling) because the general had the audacity to lose a battle; it was lost not for strategic or tactical reasons, but because of a wickedly effective public relations move. In hindsight though it was a bad move, because Solon Jhee was respected by the other generals, and Luca killing him unnecessarily began a turning point for several of them to conspire his assassination.
Took a Level in Badass: Storywise, he comes off as a respected mercenary leader as opposed to the Jerk Ass he first came off as in the early parts of the first game. Gameplay wise, he's even better as a member of the team than the first game, where he was already a good character.
Ship Tease: With Ayda. Due to both of them having animal companions and a mutual love for nature and animals, they seem to get along very well. It's even mentioned that they keep correspondence with each other after the war.
Armor-Piercing Slap: If you choose the path where you run with Nanami during the Tinto events, Flik, Apple and Shu will eventually catch up to you. If you refuse to come back, you will discover that Ridley made a Heroic Sacrifice fighting off Neclord's zombies, while looking for you. Shu then slaps the Hero, and proceeds to deliver to him a What the Hell, Hero? speech.
Impossible Task: He (rather cruelly) tells Apple that if she can find a coin that he hurls into a river, he'll join the hero's cause. Nanami notices that he didn't actually throw the coin at all, but switched a rock for it at the last second. However, they find the coin anyway, because Richmond stole it from Shu and tossed it in the river bed after the sluice gate was closed.
Intrepid Merchant: Having been cast out by Mathiu, his uncanny grasp of the movements in the world quickly lead him to became rich through trading.
Henpecked Husband: He's married to Kimberley from the first game, and as Richmond notes, he left Toran to get away from her. She also has a crush on Yam Koo despite this fact, which may explain why both of them skipped town at the same time.
Stone Wall: She has one of the highest defensive stats *
Defense, Magic Defense, and HP
in the game.
Information Desk: His speciality. He can be recruited (for a small fee) to find out the whereabouts of as yet recruited characters, although a certain amount of Figure It Out Yourself is also required.
Knowledge Broker: In addition to letting the hero know the location of potential recruits, he can also investigate current team-mates, offering fun trivia and useful game information about pairings for unite attacks, for example.
The Barnum: When first encountered, but he joins the Allied Forces after the hero beats him in a coin flipping bet (where Richmond used a weighted coin). He apologizes for tricking the hero and agrees to join, impressed that the hero saw through his trick.
Action Wife: She's significantly more formidable in battle than her husband, Freed.
You All Look Familiar: His design is quite simple and he is dressed just like one of the generic non-player character townsfolk from Suikoden 1, in what appears to be a fond Shout Out to the previous game.
Fetch Quest: Required to recruit him. He sends the hero to fetch various random items, then denies having asked for them! The solution is to hurl the third item, the wind crystal, at him. Hhe then agrees to join, impressed by the hero's pluck.
Ascended Extra: He's probably the very last character you recruited in I, and plays zero role in the plot. Here? Not only he can be recruited earlier, he's also got a frigging subquest revolving around him.
Rule Of Cool: The outfit, the gun, the mysteriousness, the brooding etc.
Side Quest: A time-based mission, based around the pursuit of his rival, Elza. After a cat and mouse game throughout various locations in Dunan, this culminates in a showdown with Elza in her hometown of Sajah. If you don't complete it within 20 hours, it's unfinishable.
Sniper Rifle: His weapon. Incidently, one of the few gun users in the Suikoden universe.
Furo Scene: His speciality. He has a passion for making baths, and once recruited, he builds a large onsen at castle HQ where party characters can be seen enjoying a nice soak. The onsen also serves as an area to display any antique treasures discovered.
Bathtub Bonding: Certain combinations of characters and antiques placed within the baths will activate a variety of mini scenes.
Hot Blooded: Literally. He's very passionate and appreciates people who are as "toasty" (flushed) as he is, mostly because it shows they appreciate the benefits of hot baths.
Four Star Badass: So much so that his reputation will make every Kobold in the Jowston City States head for the battlefield without question. Bonus points for being more than happy to join his troops on the front lines.
This even comes up in gameplay, despite him not being available as a party member ([[Missed Moment of Awesome if only). In war battles, his unit has a high chance of scoring critical hits.
Batman Gambit: He and Shu cook one up to fool the Highland Army into thinking the Kobolds are still vulnerable to Fantastic Racism post-Two River so they can outflank the Highland Army later when they least expect it.
Blue Blood: He is Kobold nobility and is the General of the Two River Army as well as the leader of the Kobold section of Two River.
Drill Sergeant Nasty: He does NOT suffer idiocy or incompetence amongst his troops, and he was prepared at one point to horsewhip Fitcher for what he perceived to be cowardice/treason.
Fantastic Racism: The three races who live in Two River - Humans, Wingers and Kobolds - do not get along and live in three distinct quarters of the town.
Heroic Sacrifice: Can perform one if you run away during the Tinto events: Ridley will die fighting off zombies, while looking for you. Shu's subsequent slap and What the Hell, Hero? speech to the hero are well deserved.
Cooking Duel: The player must use the various ingredients found during the game to create recipes for Hai Yo as he battles the Black Dragon Clan members in a series of minigame cook-offs, which are judged by other members of the Allied Forces. Antonio and Lester from Suikoden 1 also make guest appearances.
Side Quest: To prove himself to Tengaar, he agrees to undertake "The Test of the Unicorn" to cure an illness she mysteriously contracts. Which turns out to be an obvious Fetch Quest sham set up by champion tsundere Tengaar to test if he cares enough about her to bother. Coincidently, the pair do encounter Sigfried, a unicorn, and Hix bravely protects Tengaar from it.
Genre Blindness: Hix, of course, has no idea the quest is fake and takes it all in.
We Need a Distraction: She acts as a body double for Greenhill mayor, Teresa Wisemail, when Highland invades the town. So she puts on a wig, and the Highland buys it while Teresa gets to her hiding hut.
Rescue Arc: The hero's team travel to Greenhill to help reinstate her as mayor from her exile.
Self-Deprecation: Felt she was not fit to take over her father's duties. In response, the citizens of Greenhill declared her the "acting mayor" instead.
Survivor Guilt: When Muse soldiers threatened to sell her for ransom to Highland, she was rescuded by Shin and hides out in a forest cottage. However, in her solitude (and safety) she blames herself for Greenhill's fall.
You Are in Command Now: She had taken over as mayor of Greenhill from her ailing father, Alec, before the Highland Invasion.
Warp Whistle: Her speciality. As bearer of the Blinking Rune, she can (most of the time, see below) transport the hero and his party to any destination previously visited.
Teleporter Accident: Her abilities can be hit and miss, occasionally landing the characters in completely random locations. In the side story, Suikogaiden, she shows that it can even land characters in completely random times.
Determinator: His defense in war battles is so high that in the battle before he can be recruited, it's almost impossible to destroy his unit. In fact, you actually can throw everything at him, and you still have to wait for the plot to take care of things because he just refuses to be defeated.
Mythology Upgrade: Unlike traditional unicorns, who's magic is mostly limited to teleportation, he possesses the unique Blessed White Lady Rune, which has 3 powerful magic attacks.
Side Quest: He first appears in Hix and Tengaar's sidequest, where Hix agrees to undertake "The Test of the Unicorn". Which turns out to be an obvious Fetch Quest sham but coincidently, the pair do encounter Sigfried, who backs off when Hix bravely protects Tengaar from him.
Shock and Awe: His unique magic rune, along with his good affinity to lightning magic.
Virgin Power: The other requirement to recruiting him is to bring a young female character with the hero to meet him.
Magic Knight: He is skilled in both swordsmanship and magic, abilities which he inherited from his parents, Eileen and Lepant. Since his three open rune slots and balanced stats make him the most customizable character in the game, the player can decide which to specialize him in, or make him a jack of all trades.
Our Werewolves Are Different: He is able to uses his Rabid Fang Rune to control his transformations, though with a twist: His rune merely helps him keep his human form easier, while being a wolfman is a inherent power.
No Sense of Direction: She's lost, looking for Jeane when the hero first encounters her, and given how she walks off in the wrong direction to your castle after being recruited, it's a wonder she got there at all.
Fire-Forged Friends: When the evil vampire Neclord turns most of the Lamp Dragon Bandits into zombies and kidnaps Lo Wen for his Bride, he joins forces with the hero's Allied Army to defeat Neclord and save his friends.
I Should Write a Book About This: He is so inspired by the hero's bravery, that he begins to chronicle his adventures. Also wrote the stage play "Neclord's End", which tells a rather inaccurate version of the Army's battle against Neclord.
Artifact of Doom: She was possessed by the power of the Blue Moon Rune, a magic artifact symbolising cruelty and compassion, that transforms the bearer into a vampire. She gained mastery over her desire to kill however, drawing on the compassionate aspect of the rune's powers and retreated into isolation.
Monster Town: However, she was soon approached by others who desired immortality and so created the Blue Moon Village, a safe haven for other vampires who had cast away their bloodsucking past. The power of the rune allowed the vampires to live without the need to drink the blood of the living.
It's Personal: However Neclord, one of the villagers, overtaken by the lust for power, stole the Moon Rune and fled, robbing immortality from the villagers other than Sierra.
Vampire Hunter: Some of the villagers, now lacking the power of the rune to stay alive, went rogue and began to feast on the living again. She was determined to stop the renegade vampires from causing suffering to others and thus she became a vampire hunter.
Badass: She can scare Neclord shitless, and even Kahn is not keen on pissing her off.
Badass Abnormal: She's a vampire and totally immune to the weaknesses of most of her kind, as she had possessed the Blue Moon Rune.
Not a Morning Person: Due to her vampiric nature. Sunlight doesn't actually hurt her, but she still prefers to sleep in.
Our Vampires Are Different: She does not need to feed on the living to sustain herself, as above. Nor does sunlight actually harm her, though she doesn't find it pleasant.
Really 700 Years Old: At about a thousand years old, she's the single oldest character yet introduced in the Suikoden series. Even the seemingly eternal Leknaat and the unseen but ancient Emperor Hikusaak of Harmonia are younger.
Noble Fugitive: He was accused of murdering the Queen of Falena, which is why he is on the run in Dunan. It turns out he did this at the Queen's own request (it's complicated), and left to avoid causing trouble for the next Queen.
Cool, but Inefficient: Pesmerga has been accused to this. He starts out as a powerhouse, but joins late, leaves no room for customization, thus the latter mentioned possible Game Breaker will surpass him. Though to be fair, for a quick-run game (for those who just doesn't want to bother with heavy customization), he's still a good choice.
Reincarnation: Implied. He and Crowley have listed years of birth after the time of their epic duel. Word Of God confirms this wasn't an error, but doesn't elaborate. Since each sought to produce power equivalent to a True Rune without actually possessing a True Rune, this presumably was their method of matching the immortality that the things grant. It's generally assumed by fans that both of them died in their duel, were reborn, and resumed their rivalry after reaching adulthood again.
The Rival: With Crowley from Suikoden 1. He is Crowley's ex-pupil but the two are now bitter rivals.
Earth-Shattering Kaboom: During a duel that took place over a hundred years ago, the force of their duel leveled three mountains and evaporated a lake.
Death Seeker: It's revealed in the Gaiden game that Elza is waiting for the day when Clive will kill her. This is in part due to the past when their friend Kelley allowed Elza to kill him during a duel they were forced into by deliberately picking a gun filled with blanks.
Parental Abandonment: Having come from a poor family Elza's parents sold her to the Howling Voice Assassins Guild when she was five.
Side Quest: A time based mission, with Clive hot on her heels. After a cat and mouse game throughout various locations in Dunan, this culminates in a showdown with Clive in her hometown of Sajah. Must be completed within 20 hours of play.
Defeat Means Friendship: After Lucia attempts to assassinate Teresa, she stops herself and Teresa promises that she will make up for her father's wrongdoing. She later makes her father's crimes public and Lucia forgives Teresa.
History Repeats: His backstory mirrors and foreshadows Riou and Jowy's own storyline. 20 years before the events of the game, he led the Highland Army and was the hero of the Highland-Jowston War. However, after Riou's master, Genkaku, rose as the leader of the Jowston forces, he was forced into a stalemate. Due to King Agares Blight's suggestion, he had to fight a duel with Genkaku. However, Genkaku did not lift his sword at all, and Han won the duel, making Jowston lose Kyaro to Highland. At some point after the Highland-Jowston War, he and Genkaku sealed their respective runes, the Black Sword Rune and Bright Shield Rune, in a cave in Toto.
Look Behind You: When faced with Jowy's murderous intentions, she feigns acceptance, but requests to finish her wine as a distraction, then leaps towards Jowy as he briefly turns away....
Anyone Can Die: .....but too late to prevent him from mortally wounding her.
Final Speech / Forgiveness: She apologizes to the Hero and Nanami for the state's treatment of their adoptive father, Genkaku, but once they confirm their happy childhood with him, she dies peacefully.
Mediator: During the Dunan Unification War, she tried to assemble the different states within Jowston to help with the opposing of the Highland Army. However, it was not a success because of the conflicts between the leaders of the states who did not wanted to cooperate.
Unresolved Sexual Tension: She and Viktor clearly have history. During their conversation over wine, on the night she is murdered by Jowy, she even laments that if circumstances were different, and she were "a little shorter", she'd have made a good girlfriend for him.
Women Are Wiser: She's far calmer with her negotiations than many of the (male) mayors/leaders of the other regions.
Guest Star Party Member: A Suikoden 1 save file saved at the very last save point is necessary to recruit him. Gremio comes with him if all 108 characters are alive in that save (and you'll get a special recipe), otherwise Ellie takes his place.
Side Quest: Once recruited, he takes part in an epic Rescue Arc to save a young boy from Banner village who has been kidnapped by mountain bandits.
If you remove him from your active party, you have to trek back to Banner to pick him up again.
Sidequest Sidestory: Ellie can be involved in the quest to recruit McDohl. It can be relatively minor or she can play more of a role in it depending on the Old Save Bonus (see Gremio's entry for more information).
Trauma Inn: She runs the inn at Banner. It's also revealed that she helped Marie run the inn at the Liberation Army Headquarters during the first game as well.
Fu Tan Chen
The Host: He's the MC of the cooking contest. He does the introductions of the judges, often slipping in hints about their tastes as well some rather daring commentary about a few of them in a personal sense.
Hilarity Ensues: Some of his comments about a few of the judges provokes some rather amusing outraged reactions.
Aerith and Bob: She and her sister have entirely disparate names, despite being sisters: Leknaat and Windy.
Amulet of Concentrated Awesome: She is the keeper of the Gate Rune, a True Rune that has the power to open portals to other worlds and dimensions. It was split in two following an attack on her village of the Gate Rune Clan by Harmonia. She kept the back half, her sister Windy kept the front half. It is assumed that Leknaat reclaimed the front half upon her sister's death.
Blind Seer: Her role is to provide astrological projections.
Cain and Abel: Her power-hungry sister Windy is desperate to reunite the 2 halfs of the rune, something Leknaat will not allow to happen. This has turned the sisters into mortal enemies.