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.
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.
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.
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.
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.