Team Skull was pretty cool, I think I liked them best just because they weren't necessarily evil, rather just manipulated hoodlums and rejects.
They seemingly just wanted to fuck around without being restricted by tradition or other social norms and such a down to earth goal is much more preferable than some sort of grandiose world ending mass genocide event or other retarded jrpg trope
Plus they had the coolest uniforms and Guzma has one of the best themes
https://www.youtube.com/watch?v=OwzjXOPbz9Q 