Want an OC apart of the Seven Warlords of the Sea? Absolutely not. It's called the SEVEN Warlords of the Sea for a reason. Besides, even if there was a spot open, majority of OCs made for this position are far too young. All of the warlords are AT LEAST mid thirties+.
Going back to if there was a spot open, what reason would your OC be a warlord? What reason would the government have to fear your OC more so than other pirates of a much stronger degree such as Marco? That's correct, they don't have a reason to fear your OC.
In short. Just don't make a Warlord OC.
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One Piece OC Advice
FanfictionOne Piece OC advice for all your OC advice needs! If you have a topic send it in and I'll talk about it