RULES OF THIS CHALLENGE:
Part 1: Not much hax here, only
Jonathan Joestar and
William Anthonio Zeppeli with not really good touch based mind hax, and Part 1
Dio Brando, with High-Mid regen but reliant on Dio's brain, and durability negation with Flash Freeze.
Part 2: Not a lot of hax here,
Caesar Anthonio Zeppeli with same mindhax, and
said character that is basically a composite living being with the powers of every life form ever and is 8-A.
Part 3: Here we start with Non-Corporeal Stands, though you can still defeat the user if you can get past the stand. Oh, and they're also invisible, but they cause air-pressure so character with extreme enhanced senses can still detect them. Possession with
Noriaki Kakyoi, Time Stop and High-Mid Regen always with
Dio Brando, Existance Erasure with
Vanilla Ice Cream, who also has High-Mid regen, as well as being able to enter his stand and both becoming a blind and invisible (even to stand users) ball that EEs everything that it touches. D'Arby brothers would work only if your character decides to play a bet against them, so meh.
Part 4: So, we start to get haxy characters.
Yoshikage Kira who can can transmutate characters into bombs that explodes and also destroy the soul of the character.
Okuyasu Nijimura who can EE everything he touches. Highway Stars that can absorb and weaken people. And
Rohan Kishibe that points and you get info manipulated into not being able to attack anymore. Probably one of the strongest Stands in the series, though not the strongest.
Part 5:
Ghiaccio with AZ,
Risotto Nero who can manipulate the iron in blood and kill via eliminating iron from your character's body and makes them die as blood can't carry oxygen anymore.
Cioccolata that can attack with fungus manipulation that destroys your body by basically eating it from the inside every time the get to a slightly lower location, but it only works with living things.
Prosciutto with age manipulation.
I'm getting hungry.
Jean Pierre Polnareff with Chariot Requiem, who passively puts to sleep people and swaps souls.
Diavolo who just precogs every thing and erases time and manipulates Causality in order to literally never get hit, and even if he can't ignore durability, he's pretty OP if he teams up. Lastly
Giorno Giovanna with Willpower Manipulation and return to zero.
Part 6:
Weather Report for passive subliminal message in the sky that turns you into a snal. Yes.
Enrico Pucci for everything. If your character survived long enough to reach here, there's not much else that can bring him down with the only possible exception being the Children of Dio.
Part 7: High 3-A
Gyro Zeppeli and
Johnny Joestar with a good deal of Gravity, BFR and some hax,
Funny Valentine with basically 2-A immortality and 2-A dimensional barriers,
Diego Brando with a dinosaur virus and
Diego Brando from Another Universe who's just Dio but weaker.
Part 8:
Josuke Higashikata (JoJolion) and
Yoshikage Kira (JoJolion)
Non-Canon:
Dio Brando (eyes of Heaven) who timestops infinites and has 2-A Reality Warping.
Kars (JORGE JOESTAR) with wall of hax.
Last round: the entire verse teams up.
Ragna the Bloodedge (BlazBlue):
Part 1: Ragna pretty much stomps this part with great ease and would probably have so much fun destroying Dio Brando. Ragna would taunt him saying he fought vampires stronger than him (Referencing that one vampire in Mai's own spin off manga series called Remix Heart and Rachel Alucard).
Part 2: Ragna stomps but would have a funny act with Joseph that has some Gintoki ref (Same Japanese voice actor as Ragna and Joseph) though he would get annoyed by the Pillar Men but in the end would win in this part easily.
Part 3: He would stomp Part 3 but run into slight trouble with DIO and Vanilla Ice but he would just get past them and slaughter them with ease. He can do this against almost every stand user some might take some time but in the end he stomps.
Part 4: Ragna stomps Part 4 but he would get annoyed by Kira or Rohan.
Part 5: Honestly Giorno and Diavolo might be a hassle due to their Stands that could incon Ragna but given Ragna's hax and passive hax he might negate those abilities and managed to defeat them.
Part 6: He will run into some issues with quite a few of the stands but he would overpower them and managed to win. Though Pucci would be annoying to face though he would in the end lose to Ragna.
Part 7: Ragna will have the most trouble against President Valentine but I feel like due to his keys in CF he would manage to win against President Funny Valentine though with great effort.
Part 8: Ragna stomps this verse.
Part Non-Canon: Well its been known he stomps Dio Brando (eyes of Heaven) who timestops infinites and has 2-A Reality Warping but when against Kars (JORGE JOESTAR) with his wall of hax? I am not so sure since Ragna might lose against Kars from JORGE JOESTAR, but maybe he might win given his CF key as well as his Black Beast Ragna key.
Final Part: Well Ragna would struggle against Part 5, 6, 7, and the non-canon parts given some characters would incon with Ragna...
Yu Narukami (Persona):
Part 1: Yu stomp Phantom Blood.
Part 2: Yu stomps Battle Tendency.
Part 3: He would run into some slight trouble with DIO and Vanilla Ice but would probably use his various Personas to get past them.
Part 4: He would incon with Rohan if he used his stand on Yu Narukami but maybe he would get past it. Kira would be a hassle but would lose to Narukami.
Part 5: He might incon with Giorno and Diavolo but if he doesn't then he finishes Golden Wind.
Part 6: Honestly Pucci might be the only threat to Narukami but given Narukami's will and the usage of Persona he might be able to pull it off given he has Izanagi-no-Okami in his power.
Part 7: Same with Part 6 with how Narukami might be able to pull a win against President Funny Valentine's Stand.
Part 8: Yu Narukami stomps this verse.
Part Non-Canon: He might be able to stomp DIO (Eyes of Heaven) given that Narukami has various Personas that could alter and change the battle against DIO. Though against Kars from JORGE JOESTAR, but maybe he might win.
Final Part: He would stomp most of the parts but would run into trouble against the people he struggled with and given he is fighting them all at once he would probably lose.