He was already perfectly capable of drawing the human body, but his choice in design was brought on by trends of the time that co-existed in both Japan & America in the 80s with Marvel & Image comics. I initially detested this art style when I started the franchise, but after experiencing the full evolution of Araki's art, I had a new perspective on it, & it's grown on me.
Jonathan & Dio are supposed to be about 12 years old in the first book, but you can be forgiven for thinking they're college aged. These thicc boys have the type of bodies you'd typically find in Freak Shows around the time the story takes place. The quickest way I can describe the character designs is "what if Rob Liefeld was a bara doujinshi artist." & for some reason they all have really tiny feet. But the background art is super detailed & every bit as good as the anatomy is bad. The art can also be very amusing when you get a weird action pose, or the unfortunate way the color pages muddied the faces when reprinted in B&W. There''s also some funny perspective issues & impossible anatomy poses that will make you chuckle. By volume 2 you can see a little art evolution in the face.
The 19th century (1800s) fashion & hair styles are a little baffling on the men due to proportions, but they just seem totally off the mark most of the time. He gets it right with adult Erina, but she does wear a 1920s swimsuit. In chapter 21, there's a woman in a mid 20th century sheer chemise, & Jojo's Deetstalker has a short front bill & an elongated back bill to imitate wearing a backwards baseball cap. Liberties like this in period pieces annoy the hell out of me; it shows laziness & a lack of research.
Ogre Street is where the story starts getting into the fantasy elements hinted at in the very first chapter. It is basically the slums, but with a Mad Max vibe to it.
It has an interesting take on Vampires & zombies.
In the time of the Inca & Aztecs, the was a warrior tribe in Mexico that brought immortality by turning the wearer into a vampire. Vampires curiously enough somehow drink through their fingers, so what are the fangs for? The sun turning them to ash still stands. Sofar this is the oldest example I've seen of the super strong, super fast zombies. They heal their flesh & talk normally, making them barely different from vampires.
Jojo is a buttmonkey punching bag with the worst luck in the world who, despite growing up rich, has no class at all. Dio is like a psychopathic take on Geston from Beauty & the Beast, who is 200% spiteful sadist & is somehow sophisticated despite growing up lower middle class. The story definitely makes you want to root for Jojo to get his act together & come out on top. Unfortunately for him, this is one of those seinen series that likes to kill off & replace its cast.
There's an animal death scene on par with Michael the Cat from Mad Bull 34 that may not sit well with some readers.
The characters seem to predominantly be named after music bands & actors from the 80s. I hear latter seasons expand to using fashion designers.
Xeno Zoldyck from Hunter x Hunter bears a striking resemblance to the man who sold Dio poison in volume 2, from his hair down to his clothes.
Speedwagon seems to have gone from robbing random people on the streets to being a goldhearted boot-licker after a single punch to the face. The best way to describe him is loyal dog, cheerleader, non-action guy, dude in distress, Captain Obvious, or exposition guy.
Zepelli comes off as a complete weirdo who knows too much, until he explains his backstory & how he's involved with the mask. The backstory was great, but the introduction to the character was beyond akward.
The weirdest character has to be Jack the Ripper.
It takes him 3 seconds to decapitate a rider & 3 horses & then cram his gigantic meat body into one of the horses so that he could make a dramatic spooky entrance. I almost laughed. Then he tries to intimidate Jojo's party by cutting off his own finger & stabbing himself in the face...to prove a point?