Protagonist of Namco X Capcom, Reiji Arisu is an agent of Shinra (no, not that Shinra), an organization that investigates paranormal activities. A specialist on Fluxes, portals that open from one world to another, Reiji's a skilled fighter using multiple swords, a shotgun and a revolver simultaneously. Ten years before Namco × Capcom, his father, another Shinra agent, was killed while fighting Saya; the scar on his forehead was from that battle. Since then, Reiji has harbored a strong grudge against Saya. In contrast to his partner Xiamou, he's very serious-minded and never hot-headed.
Achey Scars: Whenever Reiji clutches the scar on his head, it's a sign that Saya is nearby.
Heroic Sacrifice: Tries to pull one at the end of the game to destroy 99 once and for all, until suddenly every single character goes Big Damn Heroes and offers to help him just beat the stinking crap out of her.
A 765 year-old "sagefox", Xiaomu is another Shinra agent, who previously worked alongside Reiji's father. Energetic, silly and an all-around nice person, Xiaomu raised the young Reiji after his father was killed ten years ago.
Anime Hair: Her multiple ponytails; the kicker? Those are actually her tails.
Ass Kicks You: One of Xiaomu's attacks in Endless Frontier ends with this at the end of the string.
The Atoner: She was the one Saya forced to deal the killing blow on Reiji's father.
Yaoi Fangirl: Xiaomu often comments about how she enjoys writing slash fan fiction. In fact, if she is in the same party as Haken Browning and Reiji in Endless Frontier, there's a chance in her post-battle banter she'll whisper "Reiji Cross Haken..." to herself, just loud enough that Haken overhears her and asks her not to ship them.
Main antagonist of Namco X Capcom, Saya is an agent of Ouma, a rival organization of Shinra seeking to bring chaos to the world. Like Xiaomu, Saya is a "werefox". She has a history with the Arisu family.
Two previously unnamed minions of Saya, Dokumezu and Dokugozu are based on "Gozu" and "Mezu", the Japanese mythological guardians of hell with an ox and horse's head, respectively.
Ascended Extra: Neither of them had any characterization, let alone voices, in Namco X Capcom and were simply no different than the mooks of the game. They reappear in Endless Frontier with distinct personalities.
Jerkass: Exaggerated, as he's incredibly callous, looks down on anyone and will backstab or eliminate anyone in his way in his path of power with a smirk on the face, there's a good reason he's one of the villains of his series.
Jerkass: Ultimately everything the Tekken series is and has been is a result of Heihachi's heartlessness and zeal. He sealed his father away under the Hon-Maru compound to seize the Zaibatsu, he threw his son off a cliff to "make him stronger" and later in his life (upon learning of his survival), held the first King of Iron Fist Tournament to draw him close. Then 22 years later he brings his grandson into the third tournament (also one he hosted) to use as living bait for Ogre and then shoots him when things don't go the way he wants. Despite the fact that Kazuya and Jin are bitter enemies too, Heihachi has definitely earned every bit of contempt from both.
Blessed with Suck: A "child of destiny"? A more accurate descriptor would be a "child of suck". He seems to have inherited no spiritual powers from Jun, instead being plagued with the cursed blood of the Mishimas. At the very least, Jun's influence tempers his demonic tendencies to a certain degree.
Big Screwed-Up Family: The fourth generation of a family that just doesn't quite see eye-to-eye... to say the least.
Humble Hero: Where most other characters meet the party with introductions that at the very least indicate what they do and what they're capable of, he simply tells them his name and country of origin.
I Hate You, Devil Dad: Has an intense hatred of Kazuya, from whom he inherited the Devil Gene he so desperately fights to get rid of. In this game, he's pretty much out to beat the hell out of Kazuya.
Mr. Fanservice: Jin isn't regarded as Tekken's most attractive male for nothing.
Gentle Giant: Obviously. This is also pretty notable that in spite of many things taking a Darker and Edgier turn, King II remains as one of the most genuinely positive, good and nice persons from the Tekken universe. Unless you touch some of his Berserk Buttons.
Running Gag: Felicia repeatedly calling her a Darkstalker despite his explanation to the contrary becomes this—only to conclude with its counter-equivalent, where he realizes she is truly a Darkstalker and not merely a cat-cosplayer.
The Voiceless: In terms of voice acting. Subverted in that he does get text dialogue.
Armor Is Useless: He doesn't seem to need to fight with his armor on. And it certainly didn't save his skin against Marduk...
Blessed with Suck: If you remember his Dream Traveler duties, having fantastical adventures in multiple worlds, making many friends along the way, and having to leave them all behind in the end, happens a lot. Furthermore, despite his insistence that he and Guntz won't forget the other heroes at the end of the game, he has a tendency in his own canon not to ever bring up major events from a previous game to the one you might be playing at any given time, so it's unclear that he even remembers those, let alone crossover adventures.
Jerkass Façade / Loner-Turned-Friend: Has already formed his True Companions bond with Klonoa here, but generally acts aloof and rude towards the others, with bounty and adventure being his primary motivations. However, once he slowly comes to see the gravity of the situation he contemplates turning tail in order to stay alive. However, with his father's killer among the main plot's recurring bad guys and with the good guys' propensity to have his back, common enemies and unpaid debts become his reason for sticking around. He initially has complete tunnel vision about revenge on Janga for killing Butz, flying into a rage anytime the cat shows up, but gradually becomes more patient about his goal, loyal to the party, and immersed in the actual quest to stop the Ouma plot. Ultimately Guntz develops into a Knight in Sour Armor, and even after accomplishing his revenge to the applause of the Unknown Soldiers he earnestly stays with the crew and helps them sees the real mission through to the end.
Roaring Rampageof Revenge: Wants to hunt down Janga at all costs, but the story's main plot and Janga's knack for escape are both constantly in his way. Ironically, it's after he mellows out, gains perspective, and becomes a true hero over time that he's able to finally kill the bastard.
Badass Normal: Mitsurugi, so far as we can tell, has no special powers and no connection to either spirit sword. The katana he uses is perfectly ordinary metal. He's made up for this by being so skilled entire armies of normal men, including ones with guns can't beat him, and he's considered a worthy adversary and ally to the cast of his game, which is mostly filled with blatantly supernatural or otherwise fantastical characters both good and bad.
Katanas Are Just Better: Played straight enough, but also subverted with his desire to capture the Soul Edge for its power.note This is probably during the time in which he wants the Soul Edge in hopes that it can overcome the power of the Tanegashima rifle, which he and his katana were once bested by in a duel.
Fighting a Shadow: In this version, Charade is a Mook type generated by the Soul Edge's power.note This is a reference to Soulcalibur II's Weapon Master Mode, where Inferno is shown creating Charades to fight in its stead
Blood Knight: Fighting is everything for Ryu, though he does not share Gouki's love of carnage. In other words, he's a Lighter and Softer Gouki. No wonder Gouki tries to corrupt him with the Satsui no Hado even in this game.
Nice Guy: While somewhat of a social recluse, he is still a sensitive and kind-hearted man with plenty of good advice to share with his friends and fellow warriors. The only major downside to befriending Ryu is how much of a pain it is to contact him.
But Not Too Foreign: He has a 3/4 Japanese heritage (fully Japanese mom, half-Japanese/half-American dad), but he lives in America. Speculation abounds that (due to his eyebrows) he's naturally raven-haired and dyes his hair blond.
Calling Your Attacks: "Hadoken!", "Shoryuken!" and "Tatsumaki Senpuukyaku", which is rendered unintelligible.
Cutscene Power to the Max: Can perform the Shin Shoryuken in a cutscene, something he can't do it in gameplay afterwards. It might be a nod to Brainwashed Ken from the mid-90s SFanime movie and Violent Ken from SNK vs. Capcom: SVC Chaos, where he could do all sorts of wicked stuff. It could be argued that as one of the top practitioners of Gouken's style, Ken has learnt at least the theory of all of his school's moves.
Beauty Equals Goodness: A beautiful catwoman, and is possibly the kindest of the cast (though she does have more competition here than in her canon series).
Beware the Nice Ones: Just because she chose a pacifistic lifestyle, and just because her motto is always turning the other cheek, it doesn't means that she cannot punch your head off or cut you into ribbons if you piss her off enough.
Boisterous Bruiser: She has a bit of it. She is also fond of tossing horrible puns here and there.
Meaningful Name: Felicia (and male name counterpart Felix) means happiness. Fits well for Felicia since she wishes to coexist with humans in peace. There's also the obvious similarity with "feline" too.
Also, Felicia constantly calling King a fellow Darkstalker despite King explaining to her over and over that he isn't a Darkstalker, he's just a human Luchador wearing a jaguar mask. This long running gag also serves a a setup for another joke, as King (after complaining endless times about how dumb and dense Felicia can be) suddenly realizes that Felicia is a Darkstalker instead of a woman cosplaying as a cat as he believed all along.
Sexy Backless Outfit: Like with the rest of her body, Felicia bares her back wholly, then again, she's technically naked.
She-Fu: Combines fighting with her natural cat-grace and flexibility. Some of her moves even flash her butt.
Absolute Cleavage: Her iconic outfit technically "only" possesses an Impossibly-Low Neckline and a cut-out right below said neckline that, combined, reveal her entire cleavage and the top part of her stomach.
Anything That Moves: Standard fare for succubi. Downplayed, as the nature of the game doesn't usually allow her to do more than flirt and find people "interesting" and "fun".
Capcom Sequel Stagnation: This game is her first appearance with updated voice work and sprites since the original Darkstalkers. Keep in mind we're talking about the difference between 1994 and 2005. Fans looking for fighting games in particular had to wait even longer for the advent of Tatsunoko vs. Capcom to fix this.
Upper-Class Twit: An insanely powerful demon who just wants to party. She also mixes this with shades of Rebellious Princess (she is the adopted daughter of the former ruler of Makai). For the most part, Morrigan's dialogue basically involves her causing headaches for the other characters, only becoming somewhat more serious when Lilith comes into play.
Winged Humanoid: With an extra pair of miniaturized, presumably decorative ones on her head.
Absolute Cleavage: A departure from the typical self-imposed A-Cup Angst…well, at least the A-Cup part. The angst is still there when we see her.
Meaningful Name: Lilith, originally appearing in myths as a Mesopotamian storm demon who was associated with the element of wind and a bearer of disease, illness, and death, is known in Jewish folklore as Adam's first wife (apparently, Eve was his Second Love) who refused to become subservient to him. She is usually referred to as a succubus herself.
Assist Character: The Mobilsuits from Side Arms: Hyper Dyne serve them as support characters.
Continuity Nod: There are a few references to Bios, the Big Bad from their origin game, in the game. They were in the middle of fighting him just when they were yanked into the Namco x Capcom plot, actually.
The Nameless: Both have never been given any names, and have went on without one their whole life. They don't really mind or care, and tell the others to call them whenever they want. Sylphie is the one to christen them "Unknown Super Soldiers" after Felicia's failed attempt.
Infinity+1 Equipment: The dress she makes available for 9999 G before starting the final chapter is this, as it raises all stats by 25.
Lethal Joke Character: Nothing about her is openly badass. She's not even an active party character. Yet the nature of her shop and everything in it indicates that she in some ways may be among the most powerful characters in the game.
Split Personality Takeover: Nebiroth was created when Astaroth's soul was split into two, a punishment he suffered after losing to Arthur in the past. When he's killed, Nebiroth takes over his body entirely.
Red Arremer Joker
Continuity Nod: Plenty of hints are thrown throughout the game about Joker being the Red Arremer from the Gargoyles Quest series, more specifically the protagonist of the third game, Demon's Crest.
Defector from Decadence: Seeing the chaotic state of the Demon Village and the bad guy's side, which reminded him of the chaos back during the "War of the Crest", Joker decides to abandon his duties, even if it meant "living in disgrace", and die fighting Arthur and the good guys in order to test their strenght and see if they could restore balance to all worlds.
The Dragon: To Astaroth, to the point he refuses to assist Nebiroth once he takes over.