Well... Scorponok created a Headmaster army using Sunstreaker as a template, but the robot bodies were just drones piloted by human Headmasters ...and they all got summarily pasted by the Dinobots and Monsterbots. But yeah. Just Sunstreaker and Scorponok. Chromedome, Brainstorm, and (now) Nightbeat are all major players in the comics at the moment. Fort Max, Hardhead, Siren, and Highbrow have also put in notable appearances. Weirdwolf, Mindwipe, Apeface, Snapdragon, and Squeezeplay have shown up in the background here and there. Fangry has yet to show up, Skullcruncher is assumed dead, and Horri-bull is very probably dead. He, like all Decepticons on Cybertron at the time, had explosives in his head should they get out of hand. He did. Bumblebee pressed the button. Horri-bull's head exploded. People inhaled sharply, their eyes glinting with the hope, "NOW HE CAN BE A HEADMASTER!" ...but he literally has not been seen since. But yeah, the long and the short of it is, the IDW universe, while featuring the G1 characters -- hasn't been married to the old toys in terms of dictating a characters' features.