Metalhead is a robotic character that is created by Donatello and, in later episodes, begins to develop a camaraderie with all four of the Turtles. He first debuted in the season 1 episode of the same name.
There are roughly one-sh*t billion tropes so PLEASE look through them before adding one. Otherwise add what you like. ADDITION: PLEASE read through the trope description provided before submitting something. It's not a huge deal but too often people submit characters that don't fit just because they misinterpreted the title...
