Giorno's and Kars's transformation GHAs. While both offer new moves, properties, and very increased mobility, it's far too easy for a player to shoot themselves in the foot if their opponent smacks them before the transformation is finished.
The menus have, among others, Robert E.O. Speedwagon, Wang Chan, Cyborg Rudolf von Stroheim, Oingo and Boingo, Ringo Roadagain...
Nukesaku as a stage hazard of the DIO's Mansion stage.
Wilson Phillips as part of the stage hazard in the Cairo Streets stage.
Yoshihiro Kira as a stage hazard of the Kira Estate stage.
Reimi Sugimoto as part of the Morioh stage's Situation Finish.
Pesci and Prosciutto, as both the stage hazard and Situation Finish of the Naples' Train Station stage.
Secco as the stage hazard of the Rome Streets stage.
Green Baby is part of Pucci's stand Whitesnake's evolution to C-Moon.
Weather Report as the stage hazard of the Green Dolphin Street Prison stage.
Emporio Alnino as part of the stage hazard of the Kennedy Space Station stage.
Lucy Steel and Stephen Steel as the stage "hazard" of the Atlantic Coast stage.
Yasuho Hirose and Joushuu Higashikata as both the stage hazard and Situation Finish of the Wall Eyes stage.
Cast of Snowflakes: The game mixes aspects of Araki's evolving art style without completely succumbing to the homogenization and lower muscle mass of his current art, and as a result, there's a lot of diversity. This is easily seen when comparing JoJolion!Josuke and Jotaro. Canonically, they are nearly identical to each other, with the same body type. In the game, they're more or less on opposite sides of the appearance spectrum.
Cast Full of Pretty Boys: Most of the male heroes in the JoJo universe are attractive as a given. But the character roster for Part 5: Vento Aureo is composed exclusively of this, even the Big Bad is handsome, young-looking, trim and muscular.
When most characters get low enough health, they enter Rumbling Mode, where their health meter turns red, and they gain increased attack and defense. A select fewnote Giorno, Bruno, Mista, Fugo, and Hermes instead get Resolve Mode at low health, where their health meter turns yellow, and they get super armor while not attacking and increased defense.
Ikuro doesn't get Resolve or Rumbling mode. Instead, his health bar turns purple when his health is low enough, and he gets Regenerating Health.
Fugo gets a new move that he can only access while in Resolve Mode. This move lets him evolve Purple Haze into Purple Haze Distortion without spending meter, when he can usually only do so by using his Great Heat Attack.
Jonathan has a move called "My final Ripple" that can revive him from defeat with 20% health and give him permanent Ripple-infused attacks at the cost of locking out his HH meter.
Valentine can expend 3 HH bars to have D4C replace him with a full-health Valentine at the cost of all his corpse parts and the usage of his HH meter.
Bruno auto-revives in Resolve Mode if he's about to lose the match for one last chance to win.
Damn You, Muscle Memory: The R1 Button is used to charge the HHA meter for Ripple using characters when you hold it down; for Stand Users (whose HHA meter charges as they perform hits), one press of the R1 button turns your Stand On, and one more turns it off. This can cause mistakes at the worst times if you start using another type after using one type too long.
Difficult, But Awesome: Pucci. Made in Heaven is insanely hard to pull off in a normal match, but Pucci's disk stealing specials and knockdown moves can help to buy enough time and meter to set it up.
Disney Villain Death: The Sitiuation Finishes of Dio's hideouts in Parts 1 and 3. Exaggerated with the Situation Finish of the Kennedy Space Center, as the loser falls forever.
The fourth trailer began with the words "To all those that love JoJo".
Downloadable Content: Alongside DLC characters, there's also the possibility of non-character content, such as Jotaro's "Looks like I've found an idiot" taunt, a code for which is included in a character guidebook for the game.
The confirmed DLC characters are, in availability order: Yoshikage Kira, Shigekiyo Yangu, Panacotta Fugo, Iggy, Old Joseph Joestar, Lisa Lisa, Narciso Anasui, Vanilla Ice, and Baoh.
Dragged Off to Hell: The Situation Finish for the Morioh town stage is the victim suffering this after looking back in the ghost alleyway.
Dub Name Change: The English version has some name changes, naturally, even if it hasn't been released yet. The Pillar Men use their romanized names (Wamuu, Esidisi and Kars) whilst Santana from Part 2 has been confirmed to have had his name changed to San Tan as of a press release.
When Johnny uses a HHA, Tusk will evolve to its next Act, or if he uses the GHA it will automatically become Tusk Act 4. Each version of Tusk has its own moveset.
The Corpse Parts that appear on the stage when he, Gyro, or Valentine are in play also affect the characters. Getting knocked down makes a character lose a Corpse Part. One part gives Johnny an increased attack power, Gyro gets to use Scan, and Valentine's Guard Guage does not decrease as much. Two parts gives Johnny unlimited nail bullets, Gyro gets to more easily retrieve his Steel Balls, and Valentine's received damage decreases. All three parts increases Johnny's HH Gauge restoration, Gyro gets the Golden Rotation, and Valentine gets D4C -Love Train- and is immune to projectile attacks.
Pucci's moveset is based entirely on this. He first starts the match with his stand Whitesnake, which is rather versatile but underpowered. By speaking all 14 of Dio's secret words to Green Baby, his stand permanently transforms into C-Moon and gives him several new moves, including his GHA which allows him to further evolve his stand into Made in Heaven.
Johnny also fits to a lesser extent, since he gains more moves the further Tusk evolves throughout the match.
Finishing Move: This game features "Situation Finishes", stage fatalities of a sort.
Some infinite combos (and really easy ones, at that) were discovered.
If Josuke's GHA hits just before time runs out, he heals the opponent but does not reduce his health again with his punch barrage.
Not quite a bug, per se (closer to poor coding), but the game's online multiplayer has bad netcode, and as a result matches are rife with lag.
Guest Fighter: Baoh, sort of, as he was one of Araki's creations too.
Handicapped Badass: Johnny is actually crippled in gameplay—he can only move by dragging himself around with his arms, using Tusk's wormholes, or riding Slow Dancer—and he's more than capable of holding his own.
Improbable Weapon User: Being a staple of the series, some characters have weaponizing seemingly mundane, everyday items as parts of their move sets. The best example, however, is Kosaku, who weaponizes Hayato, via his Stand's "Bites The Dust" ability but still.
Limited Special Collector's Ultimate Edition: Every first edition copy of the game come with a notepad designed to look like Hayato Kawajiri under the effects of Heaven's Door and a code to download Yoshikage Kira as a playable character. There's also the Gold Experience Box, which comes with a gold placard of Giorno/Gold Experience, a statue of Jotaro/Star Platinum, and a soundtrack CD that resembles the Star Platinum Stand disc created by Whitesnake.
Never Trust a Trailer: PV6 showed footage of Jotaro fighting Dio, where Dio is wearing his jacketless costume. In the actual Story Mode, he's wearing the same outfit as all his other fights.
Nice Guy: Giorno proves he is as sweet and kind as his biological half-father Jonathan in the "what if" DLC scenario for Vento Aureo.
Power Creep, Power Seep: In the JJBA universe, Stands are only visible to those who have another Stand. Here, the non-Stand users can presumably see them, allowing them to avoid attacks and strike at the users through the Stands.
Power Up Let Down: Gold Experience's ability to transform objects into living things is one of the most diverse and creatively applied Stand abilities in the manga, and Giorno being The Chessmaster that he is, it's his most frequently abused one. It's not really represented at all in the game, with his Rapid Fire Fisticuffs and his perception-slowing punch taking precedence.
Reaction Shot: A panel of the character panicking appears above the special gauge upon being knocked down and taunted. If running low on hp, they'll look really angry instead. The third version of the panel appears when taunting Josuke or Joseph during their special taunts.
Spoiler Opening: Like the trailers, the opening displays some of the plot twists, battle climaxes and even deaths from the manga, though too fast for a viewer to really understand all the details at first.
The Stinger: In all of the trailers but the fifth and sixth. The first introduces Dio, the second shows off Gold Experience Requiem, the third demonstrates Jotaro's time stop, the fourth introduces Yoshikage Kira and the Limited Special Collector's Ultimate Edition, the seventh introduces Baoh, and the eighth introduces Vanilla Ice and Anasui while showing off more of Baoh.
Story Breaker Power: Subverted with Gold Experience Requiem, whose power is to nullify any action taken by an opponent. It's not nearly as broken as it is in the story; they balance it by limiting the Requiem form to Giorno's Super Mode and turning its ability into a Counter Attack with strict timing. Also, Requiem takes three real seconds to activate.
Shigechi as DLC came right out of nowhere and added yet another Part 4 character to the roster. To further add to the surprise factor, it had previously been made known that a guidebook for the game covered "32 characters + 2 DLC", when 33 of those characters were already known. Needless to say, people were expecting someone a bit more momentous for the final, single character reveal.
The same somewhat goes for Fugo. Not only did the man only have one real fight, and thus, not a whole lot to use for a playable appearance, but he pretty much bowed out right at the end of the first half of Part V (Araki wrote him out as he found it difficult to write fight scenes around Purple Haze's powers). Still, there are others definitively more unexpected than him...
...Such as Ikuro Hashizawa, who is not from JoJo but from Baoh, a manga Araki wrote beforeJoJo. This has caused a rift in the fanbase; see the YMMV page for more details.
Weirdness Censor: Most of the stages have onlookers, most of whom watch the fight, with some commenting on hazards. However, the background characters for the Cairo stage simply do not care about the insanity occurring right next to them. Granted, Stands are Invisible to Normals, but they should still see such things as a man teleporting around and dropping steamrollers, a woman unraveling herself into string, a man's bullets being redirected in a zig-zag pattern, or a long-dead president of the United States (though to be fair, not one from this present timeline) disappearing into an American Flag, or any one of the crazy things from the first two parts, but no one bats an eye. They don't even react when a car speeds right past their table.
What Could Have Been: Interestingly not for the game itself, but a case from the manga being adapted in the game. If Fugo is pitted against Giorno, Bruno, Mista, or Diavolo the special conversations play out as if the dropped plot point of Fugo being a spy for the Boss had actually happened.
Against Narancia, however, the special intro instead regards Narancia's mathematics lessons and how upset Fugo gets over an incredibly wrong answer. If Narancia wins, he immediately begs forgiveness from Fugo.