Hmh... I can help with the Decepticon part. I have a 'Con OC called Backslash. He's a crimson red GTA Spano, and he's traitorous and thinks only for himself. He has served as a double agent for both factions, and betrayed both a couple times before finally settling with the Decepticons. He's a backstabbing, murderous traitor, but not as cowardly as Starscream. He tends to avoid fighting, as his mind lies with money and his own life, but he does not hesitate in fighting for his life when cornered. He usually retreats if he's damaged enough, and goes to hiding for some time before returning to his "master" to heal his wounds. He's particularly skilled in close range combat and melee, and he's equipped with razor sharp twin blades on his both arms and a hidden knife in his left arm's sub space.


(I haven't drawn him yet, but I have a few ideas.)