Anyone can be beaten .. also kuma is a cyborg just unplug him lol! But yeah i think he can be beaten like anyother it will be hard but doable. I think the two ppls who can beat him easier are Logia-users, but, expecifically, Enel, since Kuma and any pacifista isnt eletric-proof, and this include Nami's thunderbolt tempo (her thunder lance already did a significant damage on a pacifista)