JoJo: Starting with Steel Ball Run

One day, he woke up transmigrated as a mighty mafia boss. Unfortunately, he'd been beaten to death and tossed onto a filthy, waterlogged street in the 17th century. Determined never to suffer at the hands of a knife again, he resolutely set out to rob his way to the money he needed to kill the president. But the president turned out to be his own boss. Chen A Suo: I quit this job! Even more terrifying, Chen A Suo has no System at all. Relying solely on the original owner's memories and his own fighting skills, he has to build his life from scratch. What kind of world will he carve out for himself in the world of JoJo? (Cthulhu + crossover fanfiction + no angst)