[Bullshit, Noriaki wants to say it. On the way to Egypt, mr Joestar told him all about Dio way back when.
Practically saint Mr Jonathan Joestar, who to Noriaki sounded like an angel from the tales (just don't think about the fact that that saint body was Dio's now...), Mr Jonathan Joestar who was as kind and innocent and forgiving snd quiet as Mrs Holly, as reliable as Mr Joestar, as "nuh uh, not over yet" and loud as Polnareff and as awkward sometimes and as "he's not dead yet" as Jotaro - he was that Dio-long-ago loving adopted brother. And yet, upon becoming a vampire, DIO---

There was no goodness in vampires. Noriaki Kakyoun, a month ago, made a simple and elaborate plan of a quick and solid and very secret (it was exciting! And thrilling!) suicide (by a sea or by Polnareff or by Jotaro, it was going to be grand, and uplifting! And motivational and very sweet) in case Dio ever turned him into a vampire.
Still, that damned Dio knew him too well, seeing as that never happened. One of many things that slightly disappointed Noriaki Kakyoin while dying (if he truly died). He wanted to do a cool vampire killing, dammit! Dio, that bastard, surely saw through elaborate plans and robbed him of that, not even sucking his blood. And if you asked Kakyoin, Kakyoin's bloodline was neat, thank you very much, also, surely a good bloodtype for Dio, so surely Dio was just petty, not sucking it.]

[Scoffs] If she's a good vampire then I'm somebody whose grave won't be forgotten the moment my parents leave this world and Polnareff's a somebody who can manage to make a girl fall for him.
Sorry, it's a bit of a tall tale, miss.