I imagine he played an integral part in Jabba's Palace or Mos Eisley.......
I like to think of him as TK421 2.0. Born on the planet Lothal shortly after the dawn of the Empire, TK was the son of an Imperial trooper, TK421, Sr. and Lothal fruit peddler. TK, Jr. was raised mostly by his mother as his father was off on secret missions to safeguard the Empire against insurgents. One of TK's fondest memories as a child was of his father giving him a stuffed Wookiee that he got while stationed Kashyyyk.
As he grew older, TK saw less of his father as he was working for a hero of the Empire, Tarkin. He witnessed several attacks against Imperial authorities by terrorist cell groups that left troops dead, which angered him to the point of action. Any one of those peacekeepers could have been his father. This fear led TK to join the Imperial Youth movement and later became a future Stormtrooper. TK was present on a field expedition to watch the destruction of a communications array, which had been hacked by a terrorist cell that was rumored to be led by a Jedi. TK was awed to be in the presence of the man his father respected, Grand Moff Tarkin. Sadly, in a few years TK lost both of the men he looked up to when the insurgents destroyed the Death Star.
When the Rebels dethroned Palpatine, TK was stationed out in the Rim. Fearing for his life, he laid low for years until he received a signal that the remnants of the Old Empire were regrouping as the New Order to bring back peace to the galaxy. TK was a diligent and loyal soldier, who was tabbed by his superiors to be brought into the fold of the Elite Guard. Unfortunately, as the New Order was making progress in their quest for peace, a group of terrorist attacked a New Order hangar and TK was caught in the blast. The details of the attack are sketchy at this point. The New Order sends their sincerest condolences to TK's family and comrades and vow to make those Rebel scum pay for their treachery.
This is fun. We should just have a thread for people writing about this guy's backstory.