The Ammo Baron is a buff cyclops military leader, and is one of the Barons of Sequin Land. In  Risky's Revenge, he resides in a military tent in Baron Desert, from which he commands his army. His goal appears to be military conquest of Sequin Land. He wants to use Scuttle Town as a staging area for his new campaign, and to this end negotiates the purchase of the town with Mayor Scuttlebutt.

Though a bit of a sleazy jerk, he is not overtly evil. Of the three barons, he alone does not attempt to fight Shantae. Additionally, his negotiations with the Mayor suggest he will sometimes choose diplomacy over bloodshed. Once he owns Scuttle Town, he renames it Ammo Town and grants all the townsfolk citizenship, giving them the same rights as citizens of his army.

The Ammo Baron owns Battle Tower and uses it as a training compound. He stored his Magic Seal in the final chamber for any victor to claim. It's not clear if he really valued it that much and simply misplaced it - Barracuda Joe did not even recognize the artifact as important, and perhaps didn't recognize it at all.

Though the Ammo Baron claims he doesn't need another girlfriend, he later makes a pass at Shantae.

More info: http://shantae.wikia.com/wiki/Ammo_Baron