Oldhead with his glasses and beard, grumpy and blasé, is quite happy to simply sit back and watch Marwin and Shorthead beating the living daylights out of each other. He often does this from his laboratory, where he invents various dooms-day machines and more or less necessary gadgets to reform the world. Like the others, he has been shown to be able of extreme greed, malice and violent outbursts, putting others on the line if it benefits his research. Much like Shorthead, however, he's been shown to be very compassionate and kind, even towards meathead. These instances are few and far between, though.