Raph- darker skin, bolt plastron scar, green eyes, and simply the attitude face he has. Leo- more like a bluish green skin, blue eyes, smoother head, and the calm look. Donnie- Oval head, gap tooth, paler skin, taller thinner look, and that grin. Mikey- Freckles, Lime green skin, baby blue eyes, flatter head, slightly more pudge, that big goofy grin and silly personality.