Big Orca

Big Orca is a main antagonist in Part 9, he is first mentioned in Arc 5: Whole Equestrian and first appears in Arc 6: Ocean Man Pt. 1

Personality
Big Orca is a confident and cocky man, but easily angered and incredibly petty, going as far as buying companies and land just to shut down an enemies income or source of entertainment, just because they mildly annoyed him, he is shown to have a lack of any morals and is willing to sacrifice sapient clones and use them as money.

Stand
Big Orca's stand is Ocean Man and it has some form of control over water. Not much else is known about it.

The Big Brothers 3
The Big Brothers 3 is a company owned by the 3 Big Brothers, Big Orca, Big Iron and Big Band, they are known for using clones as money and make big purchases disguised as "Investments", to bring down their enemies, such as buying the land that made the most money for Josuke Higashikata and the Higashikata Fruit Company and getting rid of all the fruit trees, or buying Nintendo to prevent Thoko from playing his games on his New Nintendo 3ds Xl.

History
Big Orca was fighting in the marines/navy seals alongside his biological brother and friends, however in a fight gone wrong all die except for him, who is heavily injured and temporarily crippled. When the mission is over and he returns home he is given little to nothing for his sacrifice. His grief and this hypocrisy lead him to coming to the realization that the war he was fighting in wasn't for anything other than oil rights and the profits of corporations. This causes him to take on the ideology that the only ones who have complete control over the population and the actions of the world are not the people themselves but these corporate entities. This drives him to develop extreme hatred and anger in his soul, strengthening his resolve. He procures a stand and mostly recovers from his leg injury and uses his newfound ability to create his own corporation of absolute loyalty while silencing competition. ''His main goal is to exert control over the population of the world in order to stop all wars, at the cost of humanity's free will. He believes the silver soul can grant him this ability''.