Was the identity of Mr Zero done differently in the manga and anime? I didn't feel like it went right here. She's gonna tell who he really is and who he really is is someone I've never heard of. It felt like it was going to be someone I had heard of. Had the others heard of him?
He's one of the Seven Warlords, like Mihawk. He's not anyone the viewer knows, even when it was first revealed in the Manga or Anime; but his being one of them makes him infamous in the OP world, and is why he was hiding his identity. He's kinda trying to have his cake and eat it too by using his position connected to the Marines and World Govt to help further his criminal organization.