Here he is, inspired by Chris Roach's build, he's G1 chunky LEGOformer Omega Supreme!
About this creation
Omega Supreme is one of the largest Autobots there is. He isn't much for words, preferring his massive frame and equally massive weapons to do the talking for him. Omega is the last line of defense for the Autobots, a titanic guardian robot capable of instilling fear and panic into the sparks of Decepticons that dare face him on the field of battle.
Millions of years ago, Omega Supreme was a member of the legendary Guardian robots, and was charged with defending Crystal City, the most spectacular city on Cybertron. He befriended the Constructicons, the city's creators. However, as it would happen, the Constructicons were attacked by Megatron's Robo-Smasher and converted into Decepticons. The now-evil Constructicons convinced Omega to leave his post to help defend the capital city, and promised to look after the city in his stead. When he left, they demolished the Crystal City, to Omega Supreme's horror.
He hunted them down, trapping them in a pit, and tried to reverse the reprogramming done by the Robo-Smasher. Though he appeared to be successful, the programming was irreversible, and Megatron had given the Constructicons a new combined form named Devastator. The treacherous Constructicons lured Omega into an ambush and in their new form attempted to use the Smasher to convert him into a Decepticon, but he destroyed the machine and they fled before he recovered from the attack.
Some time after these events transpired — after the launch of the Autobot and Decepticon starships — the Constructicons left Cybertron in a starship and tried to locate the missing Megatron. Omega Supreme pursued them, "for millions of years, across the galaxies"; eventually, the Constructicons rejoined Megatron on Earth, and Omega Supreme followed them there, still seeking revenge.
Okay, so he's a glorified minifig! STILL better than any Kre-O version Hasbeen, er Hasbro could come up with. And unlike the Krap-O stuff, MINE ACTUALLY TRANSFORMS!
As always, feel free to leave comments / critiques, definitely build on and always HAVE FUN!
P.S. All info on Omega supplied by our good friends at TFWiki.