Father Styx

Father Styx (ステイクス) is a minor character appearing in Part I: Phantom Blood.

History
Father Styx was a presumably Catholic Priest that boarded the ship to America, the same ship Jonathan Joestar and Erina Joestar went on for their Honeymoon. It is revealed in a flashback that he was assigned a mission by the other priests to travel to a Mexican village in order to convert more people there to their faith.

Phantom Blood
After the ship set off, around the time Jonathan discovers Wang Chan, Styx is seen gorging himself in alcohol, apparently unhappy with his assignment. He mentions that his superiors usually send him to undesirable places. He had also dropped his crucifix into one the metal grates located inside the ship. The grate connected to the Ship's hold where the cargo was stored, so the priest had to make his way downstairs.

In the hold, he finds his crucifix on top of an ornate style box. He picks up the cross and notices that the lock to the box is actually unlocked. Styx goes in for a closer look, but having touched the box caused a security mechanism on it to activate, causing the gem located above the lock to shoot out and fire straight into Styx's face. The impact from the gem causes Styx's head to explode and he dies abruptly. It is later revealed that this box was actually the coffin that contained Dio Brando's severed head.