The Predators are a group of bandit known and feared in the Largest Black Spot in Japan. They are infamous enough that people become afraid after hearing their name. Not much is initially known about them as they are known for being quite ruthless killer bandits. They are lead by the Needless Solva, and are made up of a 5-7 person group with varying ages and gender.
They regard Simeon Company as a far larger threat to the entirety of the Black Spot than anything. This lead to them working together with the Mercenary Guild in the Black Spot to work together. Hence Seto and Solva's partnership, even though they were initially adversaries.