Originally Posted by
The Drunkard Kid
If he's following his normal MO, then most of the heroes probably never find out that he exists, since he tends to squirrel himself away and have powerful henchmen who are either fanatically loyal to him or mine controlled to the point of never voluntarily giving him up act on his behalf on the outside world, and Murray of those henchmen also had no idea what his actual power was. Also, he's usually thousands of miles away from Japan, so the MHA cast probably wouldn't be on call for anything that goes on.
Like, the only reason that he was even discovered in Part 4 was because he somehow involuntarily caused Joseph's daughter to fall I'll and Joseph has a scrying power. And if anyone tries to confront him head on, I don't think that anyone has a counter for The World's time stopping combined with Dio's vampiric stats and ability to sink into the flesh of people to drain their blood.