Metal-Boto is a fully mechanical warrior who is a mix of Roboto and Metalhead. He is a character appearing in the Turtles of Grayskull (mini-comics) and Turtles of Grayskull (comics).
Turtles of Grayskull[]
While Man-At-Arms tells the Turtles the story of He-Man's origins, Donatello works on Roboto to upgrade his cybernetic lifeform into another entirely new cybernetic lifeform. Beast Man shows up at Palace of Eternos and then leads Teela and three of the Turtles into an ambush at Snake Mountain. Man-At-Arms and Donatello fly over in a Talon Fighter to drop the newly minted Metal-Boto, a combination of Roboto and Metalhead, into the fight. Metal-Boto tells the others to leave, saying that he can handle Skeletor's evil mutants. Belly of the Beast (Man)
At Snake Mountain, Shredder orders Bebop and Rocksteady to take the mutated He-Man into the pit to be resubmerged in mutagen. When they throw him into the pit, it is revealed that Metal-Boto was captured and mutated. Fortunately, He-Man has used the Shroud of Shape Shifting to disguise himself and is not actually a mutant. He-Man uses his Power Sword to cure Metal-Boto, Ram Man and Moss Man. They then join the fight against Skeletor, who is advancing on Castle Grayskull. He-Man in a Half-Shell
Metal-Boto is among the Masters of the Universe, Turtles, and their allies who join the major battle against the forces of evil. Turtles of Grayskull issue 1