Lieutenant-Colonel Von Hacke
Commanding officer of the Hanoverian Duke of Cumberland Hussars.
He disgraced himself and his regiment by fleeing the battlefield and ignoring orders to return to his position.
After the battle of Waterloo, he was subsequently removed from command.
Lt-Col Hacke (behind Captain Seymour)
In my opinion this site is the best source of uniform reference for the 100 days (Waterloo) campaign: