These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Yu-Gi-Oh! Forever
Ass Pull: The protagonists tend to get just the cards they need, right when they need them.
Abel Drake. He mind-raped Miriam and Malachi when they were small children and made them join his Lightbearer cult, and this was after murdering their mother before their eyes. Then years later, he forced Jillian to mentally relive her sister’s gang-rape and suicide before stealing her soul afterwards.
Bryce Zabel. He had no qualms about implanting a mind-control chip into four-year-old Seta’s brain stem without his knowledge or consent as part of an attempted Xanatos Gambit to take over Kaiba Corporation for himself and get revenge on Seto in the process.
In relation to the above, Gozaburo had sanctioned the creation of the chip for just such a purpose. And then he willfully and knowingly brainwashes his own grandson with the power of that same chip years later, then holds an entire stadium of innocents hostage with the threat to kill ANYONE who wouldn’t bow down to him; not to mention the Sadistic Choice he forces Yugo to face at Tokyo Dome.
Evil Is Sexy: Regina Brissett; in fact, when she's first introduced with the other Zodiacs, the establishing shot the text gives of her is to emphasize her Most Common Superpower. Zander is a male variant of the trope, catching the eye of two girls in his introductory chapter.
Malachi Jordan is an odd case. He would have arguably crossed the line with how he tortured Raven Pegasus during their duel in the Intercontinental tournament arc; however, in his defense, he was Ax-Crazy and had a Dark and Troubled Past and, following his Heel-Face Turn, has since become The Atoner.
Abel Drake's was slaying Malachi and Miriam's mother in front of their eyes, stealing the woman's soul to power Zorc Necrophades' resurrection, and then brainwashing the two to serve his bidding.
Jude Lassiter crosses the MEH in a big way: by brainwashing Grandma Muto and using her in an attempt to butcher Yugo inside his own house.
Zander crosses this when he knocks an unconscious Kyo off the side of the liner at the end of their duel.
In Chapter 231, when Stephen and Kyo meet up to duel each other, Stephen threatens all sorts of violence to Kyo in revenge for beating his face in with a crowbar when they were in high school together. Kyo’s unfazed, noting that Stephen, a bully at the time, had it coming. Then Stephen hints that after he defeats Kyo, he’s going to have... "fun" with Miki and force Kyo to watch. The language he uses suggests that it wouldn’t be the first time he’s done such a thing, either, which means he’s crossed the MEH off-page already.
Stephen Ingram: I especially love it when they struggle. It becomes more...gratifying that way.