Tales of the Abyss/WMG

Auldrant is Derris-Kharlan

 * It makes sense, doesn't it? The Qliphoth looks like Derris-Kharlan, it's a world where mana/"fonons" is everywhere, it's implied that every inhabitant can use magic/"fonic artes" (thus making them elves, further cemented by the fact that there is only one race), and the Tower of Rem is an Expy of the Tower of Salvation, which linked Derris-Kharlan to Sylvarant/Tethe'alla.

Tales of the Abyss takes place in Tales of Phantasia's negative mirror universe, and the God Generals are the evil versions of the Phantasia cast.

 * Largo=Cless. Revenge-based tough guy characters who often resort to violence before logic.
 * Asch=Chester. The outsiders. They are closely related to the main protagonist in some way (Chester is Cless's childhood friend; Luke is Asch's childhood clone) and spend the majority of the story separated from their parties. Both are playable for a small portion of their respective games.
 * Legretta=Arche. Both have ponytails. Legretta's apocalypse-bringing devotion to Van is an exaggeration of Arche's fangirl mannerisms toward Chester.
 * Arietta=Mint. Mages who talk to animals. Both are very close to their dead (adopted) mother. Arietta's forest friends may be a reference to Mint's general affinity toward druidism. Also, just look at their character designs. Look at them.
 * Dist=Klarth. The silver-haired scholars of their team. Both use indirect combat abilities that are treated as obscure trades in their respective universes (command over Summon Spirits in Klarth's case, command over robotics in Dist's).
 * Synch=Suzu. Ninja characters with virtually no attachment to the main plot.

Van and Tear aren't real siblings

 * Seriously, considering the age gap, perhaps Van's mother had an affair with another man before Hod fell, and the man died during Hod's fall, and she never revealed her affair. In that case, thank goodness Tear and Van had the same hair and eye coloring, or people might've suspected that they were half-siblings.
 * Actually; I know people who have similar age gaps in real life. My eldest uncle for example has two siblings who're young enough to be his children. I think Amy Carter was also like that, too. (Her siblings were way older than she was, right?) I assumed Tear was like that.
 * It's easy to justify the age difference: their parents had each of them and gave Van that Name To Run Away From Really Fast Because The Score Said To. If Van was allowed to read the seventh fonstone as a child, whichever one of his parents was descended from Yulia certainly did, meaning they must have been aware that Van was going to destroy Hod. That just adds another level of hell to Van's already awful childhood...

Kristoph is Jade's Evil twin.

 * They are too similar. Scarily similar.
 * Oh God. Poor Klavier.

Deader Than Dead is the end of all Non-Seventh Fonists

 * While normally injuries can be healed and the dead revived on the battlefield, dies because it takes him too long to get to a seventh fonist, which would explain why Jade  instead of telling his companion to run for a seventh fonist. According to mythology, seventh fonists go to the Fon Belt when they die, since their seventh fonons would contain their memories  even though he died of fonon dispersal and there was nothing left to heal. This means that when Jade or any other non-seventh fonist dies they will be Deader Than Dead, due to lacking Auldrant's version of a soul.

The Zao Ruins were built by Dorfs.

 * The place almost seems to have been designed by someone that embarked in an arid biome:
 * The ruins are almost completely built within a large, extensive cavern.
 * The ruins can collapse upon themselves when given a sufficient shock, as Sync claims. Stone-fall and cave-in traps are extremely common and fairly easy to set up in Dwarf Fortress.
 * The Zao Desert was supposedly much more fertile than it is now. What are Dwarf Fortress dwarves really good at? Why, tuning otherwise habitable places into inhospitable wastelands.
 * The civilisation that built the ruins no longer exists. In Dwarf Fortress, the failure of a fortress isn't just an option, it's a staple of the game.
 * Dwarves have a fondness for building massive, sprawling structures which frequently double as weapons of mass destruction, for no apparent reason. Said structures also have a tendency to backfire spectacularly when the wrong lever is pulled. Now, why would you build an underground city around and on top of a piece of ancient technology that's holding up the planet's crust, knowing full well that any failure in the machinery will drop said city into the Qliphoth? Because it's dwarvenly.
 * And finally, Giant Desert Scorpions are highly prized pets and war animals in Dwarf Fortress. You must fight one in the second visit to the Zao Ruins.

There will be an Enhanced Remake of the 3DS Version on a Sony system
Because Namco LOVES Sony, and they love to give the middle finger to Nintendo, Microsoft, NA, and PAL Territories. (PAL especially.)

Leia is the living reincarnation of

 * It just so happens that ended up in Xillia where she was reborn as Leia.

The Score doesn't actually say anything.
The Score is just sound, and a Scorer reading it is analogous to a fortune teller reading tarot cards, but with notes and chords instead of pictures. It explains why the Score is vague on important things like the world's future, yet detailed enough to tell people what to cook for dinner, and completely leaves out important things like fomicry. Yulia developed the guideline for interpreting the seventh fonon, and the Planet Score is just her personal interpretation of what she observed when she asked "what does the future hold?," and nobody ever questioned it because the Order of Lorelei has a monopoly on Scorers and questioning Yulia would be heresy. The Score is purely a Self-Fulfilling Prophecy, and the characters aren't screwing destiny because there isn't actually any destiny to screw.

Noelle is psychic.
Whenever you leave the Albiore in the middle of a continent, if you go to any port and "depart", you'll be in the Albiore outside said port. Even if you park it in Yulia City and take the Yulia Road to Daath, she'll fly to the Outer Lands to pick you up. While this may be explained by her just figuring if you're not in the city, Daath is the only other place you could be, this is not the only evidence. If you're on the Kimlascan continent, you can either depart from Baticul or go through the marsh and depart from Sheridan; either way, she's at whichever one you go to. If you go halfway into the marsh (from the Baticul side) and then head back to Baticul, she'll be waiting for you there. This means she's not just heading to the other side if you take too long, she knows where you're going and decides to meet you there.

Lorelei knows Luke & Asch's names because...
...They're mentally linked, and a person's identity tends to be among their strongest memories. Lorelei can read their identities from their minds, but their other memories (including others' names) are too faint for it to read. Hence referring to as "one who would seize glory": it didn't know his actual name.