Bulkin (ブイキン) is the major antagonist of Nobita's Great Battle of the Mermaid King.
Bulkin is a tall and imposing merman/demon fish with yellow skin and green hair. His body is covered with an iron armor and and horned viking-styled helmet that only exposes his eyes, mouth, and beard. In the manga, Bulkin has more fish-like features and his armor is stated to have once belonged to Manatia, the legendary King of the Merpeople.
Sophia ● Haribo ● Queen Undine ● Dr. Mejina