Optimus Prime and Megatron, but they're people.

Let's imagine a truce between the leaders. They unite to exterminate all the Insepticons remaining on Earth.
how their appearances are described
Megatron's appearance:
He has short, slicked-back gray hair, thick dark eyebrows, a light stubble, and deep-shadowed, reddish eyes. Small scars cross his face and neck, and his large, muscular build is accentuated by a light-colored jacket with red stripes on the sleeves.
Optimus:
He has neatly styled dark blue hair with a strand of hair hanging over his forehead, blue eyebrows, and a small, neat beard. He smiles with his eyes closed, has a strong build with muscular, sculpted arms, and is wearing a tight-fitting dark top with wristbands (and I wrote, don't think I'm that fucking smart). *

• And now they are sitting on the grass after a long mission, both tired.