https://astroboy.fandom.com/wiki/Pluto
Pluto (プルートウ Purūtō) (also known as Bruton in the 1980's version) is a giant metal fighting muscular robot with horns and red stripes on his face. He was built to destroy the strongest robots in the world, including Astro.
im forced to conclude. pluton is a giant robot hidden in the magma at the heart of wano.
