The user of Yellow Temperance.
Who is Rubber Soul?
Jotaro above 60MPH
What is "Highway Star Platinum"?
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Who is DIO?
The part that introduces Stands, part 3, names them all after tarot cards. Starting with part 4, Stands start being named after musical references.
Um, actually: There are two Stands in Part 3 named after songs. Cream, and Tenore Sax.
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What is DIO approaching Jotaro?
The user of Wired.
Who is Pork Pie Hat Kid?
Captain Tenille in the Kennedy Space Center.
What is "Dark Blue C-Moon"?
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Who is Diavolo?
While most parts are self-contained, some things cross over. The Stone Mask and Arrow feature in several parts, but the only characters to cross over are DIO, and 2 Jojo's, as well as Jonathan's body used by DIO.
Um, actually: Koichi and Speedwagon feature in several parts.
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What is "Jotaro losing his Disks"?
A user of the Stand "Tomb of the Boom"
Who is...(A secret for later)?
DIO reborn with an Italian PC.
What is "The Green Babyface"?
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Who are the heroes of Morioh?
Stands can do all sorts of crazy things! Like Mandom rewinding time by 6 seconds, Manhattan Transfer manipulating air currents, Kraftwerk quantom locking objects, and Pole Jam clearing your pores using Italian cooking. What a bizarre world!
Um, actually: Manhattan Transfer doesn't manipulate air currents, it only reads them.
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What is "Gold Experience Requiem"?
The real name of the possibly alien possible stand user.
Who is Nu Mikitakasho Nshi?
Thus Spoke the end of Time
What is Made in Heaven's Door?
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Who is Josuke Higashikata?
Like the artist Cher, many characters in Jojo have only one name. Diavolo, Doppio, Kars, Whammu, Esidisi, Iggy, Forever, and Nukesaku are example of such characters.
Um, actually: Doppio's first name is Vinegar.
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What is "Kill-A explosion"?
The names of all Boom-Boom Family members.
Who are Andre, Benjamin, and L.A?
Rock, Paper, Scissors in Pompei via train.
(This one's a triple!)
What is Beach Boy II Man in the Mirror?
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Who is Enrico Pucci?
While the first Stand VS Stand battle is vs the Boom Boom family, the first enemy stand user we see in Steel Ball Run is Diego Brando (although he doesn't become a Stand User until later).
(I only count enemies up to Philadelphia)
Um, actually: Sandman/Soundman is the first stand user (and first named character) we see in Steel Ball Run.
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What is "Hot Pants"?