History YMMV / XenobladeChronicles3

** N, for achieving the previously-unthinkable feat of [[spoiler:'''[[EmasculatedCuckold being cucked]] by [[HeelFaceReincarnation himself]]'''[[note]]Well, not exactly. M elaborated a plan so that she would trade bodies with our Mio and act as them until her homecoming, causing the one to die to be M, and Mio to live on her Moebius body. M still loved N, but just wanted to show him that she didn't want immortality if it cost the lives of many. Still, N ''does'' treat it as if Noah stole his Mio, so that's why everyone treats it as such.[[/note]]]]. Any discussion regarding him will usually end up circling back to that, for better or worse, and will almost always bring up him screaming about Mio like in his VillainousBreakdown.

** While the Queen of Agnus [[spoiler:(specifically, the real one) ended the last game having confessed her love to Rex, and is heavily implied to have had a child with him, the nature of her relationship with Pyra and Mythra who are also strongly implied to have become Rex's wives is more unclear. As a recruitable postgame Hero, she wields spectral copies of their swords and incorporates their appearance into her outfit and hair, but it's left ambiguous whether it's for platonic reasons ([[MarryThemAll as friends content to be Rex's wives together]]) or romantic reasons (not just being co-married to Rex but to each other {{Polyamory}}, continuing off some LesYay implications between Nia and the Aegises from ''2''). The fact that Rex is revealed to have become a temporary avatar for Aionios via HeroicSacrifice in ''Future Redeemed'' in Aionios while Pyra and Mythra shapeshifted into Matthew/Noah's gauntlet (and thus no way to see the characters clarify these relationships) probably didn't help with the ambiguity.]].

** Like Agnus Castle, the Upper Aetia Region hosts a few story highlights,[[note]]namely Mio's Side Story and the entire final confrontation with D and J and first encounter with Queen Nia,[[/note]] but is generally seen as the weakest SlippySlideyIceWorld in the series -- which is even odder considering that Swordmarch already exists as that kind of environment. Upper Aetia is generally seen as an underdeveloped region with a lack of variety or interesting features, and it doesn't help that very few sidequests take place there.

* AssPull: The official artbook includes [[WordOfGod an interview with series creator Tetsuya Takahashi]], in which he [[MindScrewdriver answers fan questions about the plot]]. While most of these details were either already heavily implied or make sense, some fans were upset and befuddled at [[spoiler:the ability of humans to directly transform into inanimate objects once transported within Aionios]], a take which caused the other ''developers'' in the interview to be just as baffled as the fans were.

** The Machine Assassin class (from Segiri) is a debuff-focused offensive class which has the problem of being available at the point of the game where enemy debuff resistance is too high for it to be relied upon. There's also the added "[[UselessUsefulSpell bonus]]" of having a debuff resistance-reducing Art that itself ''can be resisted'', as well as its arts being ''incredibly'' slow to recharge. It can work decently well when paired up with Taion's Ouroboros form, which massively decreases enemy debuff resistance simply by being active, or with a Shackle Ring, whose special effect dramatically increases the chances of debuffs landing, but as with Stalker, it gets easily outclassed by Attackers that require far less setup.