Breathsibart...forgive me...
These story bosses are the only ones that unlock new skills and out of these 4 so far only 1 gave a notable new skill with a ranged drag. 2 of them were just basic game mechanics and the 3rd was a run.
The boss itself annoyed me because in the 2nd phase when he pulls out a big sword the bgm goes full tryhard orchestra while the hitboxes and collision boxes are jank like a NES shovelware game.