So, Adio Suerte is indeed the main villain. However, he's like a male counterpart to Robin. Even the way he uses his powers mirrors Robin's pose.
It turns out Waford was originally a Sky Island that fell into the sea, and they had such advanced weather manipulation technology that their main device, the "Divine Breath" was considered an Ancient Weapon! So, naturally, the WG slaughtered them all. It also turns out that a member of his tribe was going to sell him to the WG to save her skin, but he escaped, so she was killed in his place. Meaning he is the last of his people.
Also, Lim isn't actually human, and was "made" by Adio's tribe to help regulate the Colossus, whose power cores are the keys to the Divine Breath with her cube power. Basically, he used Lim and the Straw Hats to get his hands on the Divine Breath so he could destroy the world in the name of vengeance against his slaughtered people.
And I do believe he has the highest non-canon bounty at 2,009,430,000.