Vampire and Pillar Men characters convert half the damage they receive into silver health, which they can heal with one of their supers. However, damage inflicted by Hamon will not create any recoverable health. This is also true of at the very least Star Platinum, a nod to how in early part 3 Stands were thought of as a ghostly form of Hamon.
Also, they can't be used in stages that take place outdoors in the daytime, with their characters in VS mode or Campaign mode labeled with a Stone Mask. If the player beats portions of Story Mode, this Stone Mask label gets a Red Stone of Aja added onto it, allowing players to access all stages.
Not only is there specific dialogue for mirror matches, but there's also specific dialogue when a character fights against his past/future self, such as Joseph and Old Joseph, Kira and Kosaku, and Dio Brando and DIO.
A few specials where the character performing the attack gets hurt (Bucciarati and Ermes's HHA and Okuyasu's GHA) actually chips away the lifebar.
Both played straight and averted with bubbles. Bubble attacks (like those used by Caesar and Gappy) can actually be popped if hit with another projectile. The aversion is that this also works on Kosaku's air bombs - in the manga, when Josuke cuts one in half, it still comes after him, because Killer Queen's power solidified the air. This is an aversion for game balance, since the explosion is unblockable, meaning that making the bubble invulnerable would make it far too powerful.
Dio Brando's "Space Ripper Stingy Eyes" HHA has a special animation which plays when Jonathan is defeated. In it, the screen zooms in on Jonathan, who attempts to block it.
Joseph has a unique counter taunt wherein he predicts his opponent's next line (one of their default taunts), for all 41 characters, including himself twice, followed by their accurate reply and unique humorous reaction shot.
The Battlefield (a.k.a. Skeleton Heel Stone) has both Lisa Lisa and Kars on the background. They won't appear if any of them is fighting.
Using any of the Pillar Men in this stage will have the vampire army cheering them on. Using Wamuu specifically will also have Kars saying that he can't lose.
Lisa Lisa (if not chosen) will also cheer on Joseph or Caesar.
Defeating Esidisi with powerful attacks will cause his brain to pop out of his skull, similar to how he escaped being defeated for a time after his fight with Joseph.
If you defeat Caesar with a light attack, he leaves behind a blood bubble with his headband in it.
Ultimate Kars does not evaporate when exposed to the sun during the DIO's Mansion Situation Finish like all other vampire or Pillar Men characters (including Normal Kars) do, reflecting his new immunity to sunlight.
DIO's "It's a Road Roller!" GHA has new animations when done against Jotaro, where Star Platinum appears to defend his owner. If the Jotaro player inputs the command for his Time Stop ability during the GHA animation, an extra scene plays out after the steamroller explodes. This also reduces the damage Jotaro takes from the attack.
Once per round, when DIO sucks the blood of Jonathan's bloodline, he gains 1/4th of a Heart Heat bar and has a unique follow up animation of his "This is the greatest kind of high!" quote. This doesn't work on Johnny and JoJolion!Josuke, seeing as they aren't of the same Joestar bloodline.
If the DIO player inputs the time stop attack, and then attempts to use his HHA, instead he will just throw a wave of knives at the opponent.
Iggy has two separate animations for his GHA dependent on whether or not the player has chosen the alternate costume for Iggy's original appearance (the more realistic dog). The normal costume has Iggy end the attack by biting the opponent's nose, and the alternate costume has Iggy ending the attack by grabbing onto the opponent's face and farting.
Furthermore, Iggy has different low health/taunting/being taunted cut-in panels depending on what costume he's in.
Subverted with the Cairo Streets stage. It features a stage hazard where, if a player gets knocked in a certain area, Wilson Phillips goes to his car, only to find DIO threatening to kill him if he doesn't drive the car through a certain path, where it hits anything in its way. If DIO (or, for that matter, Part 1 Dio Brando) is in play, this still happens anyway.
The DIO's Mansion stage's Situation Finish involves the defeated player getting thrown through a hole in the wall. If a Vampire or Pillar Man character is thrown, instead, they'll be reduced to dust by the sunlight.
One of the Story Mode episodes is set immediately after Polnareff kills J. Geil, leaving Hol Horse in a severe bind. During this fight, Hol Horse cannot use any moves that involve Hanged Man. Because his throw's animation involves Hanged Man, this even disables his throw.
Josuke has a counter taunt that makes him temporarily invincible so long as he has Heart Heat Gauge. This involves every character insulting his hairstyle, including himself.
His Barrier move visually changes depending on which stage he's in. The Morioh stage is a white brick barrier, the Colosseum stage is a brown brick barrier, and the Prison stage is a green leaf barrier.
Kosaku's GHA rewinds 10 seconds of the timer, which not only allows him to recover some health, but also reverts Giorno's Gold Experience Requiem back to Gold Experience, Pucci's Made In Heaven back to Whitesnake, and Ultimate Life Form Kars to Regular Kars. This will also restore Jonathan's Heart Heat gauge if he just used his "My final Hamon" move and got back up from it, as well as restoring Valentine's Heart Heat gauge after he just used his "Back from the other side!" move.
If his GHA finishes Rohan, this results in him shouting "Koichi-kuun!" when the bomb goes off.
It's possible to use Koichi's HHA or the standard move "S.H.I.T." to slow down Kira's Sheer Heart Attack. This also forces Kira into a crouched state, supporting one hand off the ground with the other.
The Morioh stage's stage hazard is a bolt of lightning that stuns everyone hit, except for Akira Otoishi, who absorbs the lightning to recharge his Stand.
Giorno's Heart Heat Attack involves a close up of someone's face as Gold Experience punches them. This HHA varies depending on the character receiving the punch.
Guido Mista lists both his stand and remaining bullets just above his super meter. If he has exactly four bullets remaining, the meter starts to go down as though he'd been taunted.
Love Train blocks every normal projectile in the game (Heat Attack projectiles still hit). This includes several attacks you might not think of as projectiles at first, including the explosion attacks of both forms of Kira, Hol Horse's Hanged Man attack, and Valentine's summoned doppelgangers.
Because Ikuro doesn't talk properly at all in his Baoh form (His speech is nothing but "BARUBARUBARUBARUBARUBARUU!",) the game's narrator will call out his attack names and actions for him.
His reaction to getting hit by Giorno's HHA changes depending on how much health he has. At full health, his face will not change in the least.
Said inability to talk properly leads to this gem, courtesy of Joseph Joestar.