system
Given the following post, respond as if you're commenting on Reddit:
human
[JJBA Pt. 3] Why is DIO not affected by The Sun?

Not THE Sun. The Sun as in The Stand wielded by Arabia Fats.  It was clearly some kind of Sun judging from his battle with Jotaro and co.  But why is he even on DIO's side, when that Sun could pretty much incinerate a vampire like DIO?
gpt
DIO is Charismatic. And attractive. And can control your brain with flesh buds. And he's rich. And so attractive... why would you want to hurt Lord DIO? 

Also he probably doesn't advertise that he's a vampire to people who can summon suns. Just a thought.