Doppio's transformation to Diavolo, at least in PV 5, is quite unsettling. We see Doppio pop up and be his usualself, when suddenly his eyes turn uncharacteristically sharp and aggressive, and his voice drops several octaves. For the brief seconds we see Diavolo!Doppio, the whole thing comes off like he's possessed. Then he steps through the panel divider, taking off his shirt, and Diavolo comes out the other side. (It's based on a scene in the manga where Doppio took off his shirt while walking behind a column, emerging on the other side as Diavolo, but you can't tell from the game's cutaway.)
Fugo's GHA has him infect his foe with the Purple Haze virus, which is known for inflicting a swift and painful death to its victims. Enjoy the screams of pain and anguish. Fun fact: when a fighter is hit by this GHA, the game plays their "knocked out" voice clip, which is why their screams are more intense. The only reason the game isn't rated M is that the screen turns black-and-white for a moment during the attack.
In All-Star Battle R, one of the battles in All-Star Battle Mode has DIO go up against Yoshikage Kira in the latter's Kosaku Kawajiri form, and when he wins, he decides to implant Kira with a flesh bud rather than kill him. If you think Kira was already bad to begin with, imagine him with Blind Obedience and Undying Loyalty to DIO.
Another fight in the Stardust Crusaders part of All-Star Battle mode is Pet Shop vs. Shigekiyo Yangu, which amusingly starts off with Shigechi telling Pet Shop not to go after his sandwich. Considering how ruthless Pet Shop is, the fact you play as Pet Shop for this fight, and especially the events that led in the original canon to Shigechi's death starting with a missing sandwich...
While it's also a badass Call-Back to his fight against Mista and Bruno, Prosciutto and Pesci's GHA ends with Prosciutto capping his opponent three times in the head with Mista's gun. This is all well and good, but against certain opponents, things can get a bit disturbing when you think about it. You can basically watch a mobster mercilessly execute teenagers and small animals.
Risotto's GHA essentially shows what would have happened to Diavolo/Doppio if Risotto's final attack hadn't been interrupted by Narancia. After perforating his opponent with a veritable storm of scalpels made from the iron in the ground, Risotto turns the iron in their blood into razor blades, making them essentially explode from the inside out in a cloud of blood and razor blades. Like Fugo and Valentine's respective GHAs, it is censored by the game briefly going black and white.
Tōru and Wonder of U are depicted here as being as unflappable and Nigh-Invulnerable as they were in the final arc of JoJolion, and it works to terrifying effect. There is absolutely nothing in the way of animations or voicework that shows Wonder of U or its master with any sort of distress or frustration, only a placid, almost apathetic serenity, as it knows full well that its opponents are already on the losing side from the moment they arrive. Not even Joseph's "Your next line is..." does anything to phase it, and it's the only character not to take the bait and respond, to the point where it's the only fighter who doesn't lose meter from the attack.
, is quite unsettling. We see Doppio pop up and be his usual self, when suddenly his eyes turn uncharacteristically sharp and aggressive, and his voice drops several octaves. For the brief seconds we see Diavolo!Doppio, the whole thing comes off like he's possessed. Then he steps through the panel divider, taking off his shirt, and Diavolo comes out the other side. (It's based on a scene in the manga where Doppio took off his shirt while walking behind a column, emerging on the other side as Diavolo, but you can't tell from the game's cutaway.)
