Hi!
I am trying to collect strange events that are never(or Barely) explained in the series and at the same time, explain a little strange world of JJBA. I mean this is not timely to errors, but "rules that apply in that world." I'm considering one-shots as part of the manga in this regard.
Feel free to suggest new ones.
Some Examples:
Afterlife in JJBA
We have a few examples:
Soul in Torment(PART VI): After her death, Reimi began to live on a "ghost alley", a interdimentional place were living people can access. Within this place, she can talk and interact with people. In the Alley, the live beings are in danger if they look at their backs.
Ghost(Dead Man's Questions) : gives light about this. He can't interact with people but can hide things withing things. Also,a type of Ghost-Eaters creatures appears.
Vindictive soul(Thus spoke Kishibe Rohan - Chapter 16: At a confessional)
Divination
There are several examples of this. The most rare will be the man who discover doppio's real identity only reading his hand. In this category Enya and Joseph can be included.
Futuristic Tecnology(PART VI)
Gender-Bender
Shrinking People
Part IV has several examples.
Aliens
Mikitaka Hazekura is an alien or not??
The Bow and Arrow's meteorite and the Silver Chariot Requiems powers.