Dear, Vector Prime.
Who is this TF that looks like Optimus in blue chest and red limbs? He was among the Decepticons that attacked the Ark in Marvel TF #1.
Dear Insurgent Invader,
This poor spark is Omicron Magnus, a former low-ranking Autobot Councilmember who suffered from a combination of Primus apotheosis and hubris. He even chose a paintjob with bolder colors to draw attention away from Optimus. During the famous Xaaron/Traachon debate, Omicron argued that there was enough energon for the ruling classes at least, and wondered if perhaps a deal could be struck with Megatron in order to spare Iacon. Optimus Prime tossed an energon drink at Omicron, who scrambled to catch it, spilling it over the Council floor. As Omicron tried to scoop up the energon in vain, Optimus lectured him: "Look how precious this fuel is to you. You, who would bargain your privilege with evil! Never. Never surrender!" The other Council members began to chant "Never surrender!" in unison with Optimus, and Omicron left in disgrace, later tendering his resignation.
Desperately seeking power, he approached Ravage with details about the Autobots' Ark launch plans. Megatron took him in as light infantry, enjoying the mockery produced by the former Autobot's appearance. In fact, when Omicron led a raid onto the Ark, the moment of surprise was just enough of a distraction to overwhelm the Autobots on the Ark's hull. He met his end when Ironhide turned an asteroid Pathblaster on him and obliterated him with one shot.