Going back even further, one of Ash's win quotes in 2003 was "Don't play your trump card till the end... the very end!" In hindsight, SNK was pretty much telling us, "Keep your eye on this guy. Something's gonna happen."
In XIII, Ash's a single entry character. Quite odd, given that he's The Hero of the saga... You'd think that it's because he'll become the True Final Boss at the end as Evil Ash, and that's right - but it's deeper than that: he's prone to manipulate his teammates to his own ends. So him being a single entry is a subtle Gameplay and Story Integration - He can make team with any character in the roster, but he'll end up leaving them in the end.
There are three people that are able to sense that Ash's intentions aren't as malevolent as they seem. One of them is King, who refers to Ash's behavior as "a cry for help" among other things. Why would she sense such stuff, considering that she's not a psychic (unlike Athena) and has relatively limited experience (unlike Chin)? Easy: she's a bartender, and bartenders are typically used to listen to the problems of people who are drowning their sorrows. This means she can catch body language signals that others cannot, whether the person she's speaking to is toasted or not; then, it's not surprising that she can see that Ash's plans and mindset are more complex than he lets other see, even when she obviously doesn't know what he wants (and never will, now that he's gone forever).
Yuri's Neomax, the Haoh Raiouken, seems lackluster compared to flashier Neomaxes, save for the mushroom cloud at the end. Unlike fellow Kyokugen practitioners Ryo and Robert, she was only taught the very basics of Kyokugenryu, aptly named the Raiou principle. In a way, her Neomax serves as a Take That! to her father and brother, showing that she can throw away Raioukens like atomic bombs.
Also, when you examine Yuri and Ryo's relationship, some interesting conclusions can be deduced/speculated. Ryo is the dutiful son, the one trained from childhood by his father Takuma to become the heir of Kyokugenryu, alongside his natural talent; Yuri is a late-bloomer, who only started when she was a teenager and mastered the basics within a year. While they love each other dearly, they also intensely clash: Ryo objected to her being trained (though he doesn't object to otherAction Girls being around, like King or Mai), Yuri decided to keep training and then add her own variations to the style. Ryo's current objections to have her around don't only come from her being a girl (though that does play a part), but because he sees Yuri's additions to the Kyokugenryu roster as an insult to the Kyokugenryu style itself... and also as a part of their interactions outside the ring. Ryo had to work very hard for his martial arts skills and to make the Kyokugenryu style widely known ever since he was a young boy, adding an It's Personal layer to what seems to be a mere "Stayin The Kitchen"-like Sibling Rivalry, even when it's not very fair to Yuri herself.
For XIV, the "villains team" and why Chang and Choi (two reformed criminals) of all people would join. Then the Villains Team trailer shows just what kindof person Xanadu is.
The meanings behind the name of Warspite, a historical Royal Navy battleship in WW2. Apparently it can either mean "despising wars" (a more modern interpretation) or "a symbol of hate/spite towards one's enemies" (an older interpretation). This could explain Iori's apparent hate of violence and yet overly violent persona and style. It can be said like this: "Iori's hatred of violence makes him act like a hateful person towards their enemies so he could scare them or at least make them surrender" or "Iori's hatred of violence fuels a hatred towards his enemies who makes him fight in the first place, so he tries to violently finish his foes quickly so he won't be violent for long".
In "Team Another World" ending, it might look like that Nakoruru has been taking a little levels in either cheerfulness or ditziness, whereas Love Heart's concern about getting back to their world made her the Only Sane Woman. However, according to Nakoruru's earlier words, she knows that while Verse was beaten, this does not mean the end, there will be an after-effect which will happen in the current world and will cause a mess, and it can strike at any time, in a day or year. So her idea of 'vacation' just meant a softer way to say 'we're staying in this world to be ready if the after-effect will ruin the multiverse again'. And Love kind of missed the point, while Mui Mui caught on quick, but only because she's also an excitable girl in the beginning.
Plus Nakoruru is now in a new world, one that she barely understands and is a novelty to her. Who's to say that she can't experience it now that she has a chance, before Verse or any other upcoming villain comes up and fucks up everything?
Rock could also be counted as an unofficial member of the Another World team based on one school of thought. Assuming he didn't age up normally in the background, which is a theory that has one hole in logicnote Rock appeared as a child in the opening to 2003, the 9th tournament. If the tournaments are yearly events, he would have only aged 5 years around the events of XIV., he has an out via the same magic which brought all of the Another World members to the tournament; he could very well be ripped from the original Fatal Fury timeline.
The original Japan Team members Kyo, Benimaru, and Goro are the personified homages to a Japanese phrase of giving birth to fire. The quote translates to "lighting strikes the earth which sparks the flame" Benimaru is the lightning due to his power to control electricity, Goro is earth due to his ability to cause seismic waves due to his incredible strength, and Kyo is fire due to his Kusanagi heritage's ability to control flames.
Why are the New Faces Team now called Team Orochi? Because of their actions back in '97, they are now branded as the ones that revived Orochi albeit temporarily. Once Done, Never Forgotten, even with Orochi sealed away.