I remember getting the American issues of Jump too. They used to give out little things like a Yugioh card or stickers of Bleach or something with them which was fun as a kid. Ren was my favorite in the whole series, and I can see where you are coming from with Jojo too. I read Shaman King as a kid, didn't get to Jojo until my late 20s and while you can see how Shaman King took inspiration from it, I agree the personalities of the spirits in Shaman King made it way more enjoyable than Jojo's offering.