Kind of surprised King hasn't used his hybrid form more tbh, but I don't really mind because I like his zoan and base forms designs much more.
Queen did switch from Hybrid to zoan once iirc, but yeah, King switches forms every chapter lol.
King does seem to be a really balanced fighter in general. Skilled with the sword, monstrous physical strength, capable of using ranged attacks with fire, his beak is dangerous too.