History YMMV / MarvelAnimeXMen

** HarsherInHindsight:

** Hank's [[WhatTheHellHero admonishment]] of [[spoiler:Dr. Sasaki for the latter's unethical experiments seems darkly ironic given his comic counterpart would later on cross far more moral lines in the comics than Sasaki does in this show.]]

** [[SerialKiller Sublime and Kick]], aka the U-Men, make the most of their limited screen time to stand out as [[HumansAreTheRealMonsters truly horrifying monsters]]. A pair of [[FantasticRacism mutant-hating]] murderers, the U-Men are known for kidnapping mutants, specifically [[WouldHurtAChild young teens]], then sadistically butchering and vivisecting them, using their organs to upgrade their own cyborg army. Along with this, the U-Men test out an experimental serum on innocent mutants that transform them into abominations [[AndIMustScream in constant pain]]. When Kick fails at killing the X-Men, he wantonly opens fire on them along with the numerous teenagers and police officers in the area, trying to kill anyone he can. Sublime, having left Kick to his fate, returns with a powerful suit of armor and before blowing himself up in one last attempt on their lives. Both spend their last moments proclaiming their hatred and disgust for all mutantkind.

* {{Moe}}: Hisako is peppy, childlike, protective of her surrogate mother Emma, and every bit as adorable as she looks. Being voiced by Creator/StephanieSheh definitely helps.
* MoralEventHorizon:
** When the U-Men try targeting ''kids'' just to improve their power, you know they've gone too far.
** Mastermind just loved to do this:
*** He started the whole plot by framing his ex-girlfriend Emma for driving Jean into becoming Dark Phoenix, leading to her suicide.
*** He posed as a loyal scientist who seemingly wanted to help his friends cure their infections, even though he himself indirectly caused it through Takeo.
*** And speaking of Takeo, he almost doomed the whole world by sadistically torturing the boy and driving him to destructive insanity, which led to him snapping and nearly destroying the whole universe, resulting in the boy’s father going so far as to attempt to commit psychic murder-suicide just to stop the damages already done.

* TheWoobie: Hisako has had it bad before she joined the X-Men, and even during. First she gets kidnapped and almost torturously experimented on a gang of xenophobic psychopaths, then she almost saw her teacher and surrogate mother Emma get killed, then she goes through a scary training session with Cyclops (which even the X-Men voice their shock and horror), she lost several of her classmates and friends along the way, and then she was forced to witness her childhood friend go crazy and try to destroy the world.
* WoobieDestroyerOfWorlds: Takeo has had a horrendous life, and it wasn’t even his fault. As soon as his mutation developed, his scientist mother had to lock him away from public view so that no one, not even his father Charles Xavier, knew about him until years after he grew up. And that’s not even scratching the surface. After being tortured to suicidal insanity by Mastermind, Takeo finally snapped, crushed Mastermind to death, spiraled completely out of control, and finally attempted to destroy the universe in the hopes of killing himself too. His powers were considered to be Omega-level, on par with Jean Grey, so he could not be stopped by the X-Men as if he was a normal villain, and his powers only exponentially got stronger and more unstable. He ultimately did so much damage that his own father was perfectly willing to shut down both Takeo’s, and his own, minds just to put a stop to his rampage, even though this would kill them both immediately. On top of that, he was even the unwilling instigator of the viral “Demon-Hall Syndrome” infection, which can destabilize and kill other mutants. Poor kid indeed.

* MoralEventHorizon: When the U-Men try targeting ''kids'' just to improve their power, you know they've gone too far.

** [[MasterOfIllusion Mastermind]], real name [[TheChessmaster Jason Wyngarde]], is the leader of the Inner Circle, a group of mutant supremacists, and the one responsible for Jean Grey's rampage across a city and her death by transforming her into [[PersonOfMassDestruction the Phoenix]], framing his former lover, Emma Frost, as revenge for Frost leaving him. Working with the mutant-killing U-Men, he fully endorses their crimes, using them to learn of a powerful mutant residing in Japan, where he uses his abilities to ingratiate himself into the lab staff of mutant researcher Yui Sasaki. Learning that the powerful mutant is Sasaki's teenage son, Takeo, who has [[RealityWarper reality-warping powers]], Mastermind spends months secretly using his powers to [[MindRape psychically torture]] the boy, eventually into a horrifying state of death-longing insanity. While holding numerous X-Men hostage, and using his powers to torture Cyclops, Mastermind reveals he plans to unleash Takeo's powers on the world like he attempted with Jean Grey, then watch the worldwide destruction and chaos that unfolds before him. Believing himself and all mutants to be the Master Race of the Earth, Mastermind treats his atrocities as his "right" for being at the top of the evolutionary food chain.

* SurprisinglyImprovedSequel: While the entire series being better than the [[WesternAnimation/WolverineAndTheXMen2009 last X-Men show]] overall would be a bold claim, the handling of Cyclops in comparison has unarguably been greatly improved. Both shows have Cyclops at roughly the same stage in his life: He lost Jean and is still grieving. But, in ''WATXM'', Cyclops was largely just a moody loner who didn't deal with it properly. Here, however, he starts with minor DeathSeeker tendencies, but evolves to the point where he overcomes his despair. Largely, people prefer the way he's written here compared to the previous show (and compared to the entire live-action film series).

* SurprisinglyImprovedSequel: While the entire series being better than the [[WesternAnimation/WolverineAndTheXMen last X-Men show]] overall would be a bold claim, the handling of Cyclops in comparison has unarguably been greatly improved. Both shows have Cyclops at roughly the same stage in his life: He lost Jean and is still grieving. But, in ''WATXM'', Cyclops was largely just a moody loner who didn't deal with it properly. Here, however, he starts with minor DeathSeeker tendencies, but evolves to the point where he overcomes his despair. Largely, people prefer the way he's written here compared to the previous show (and compared to the entire live-action film series).