It doesn't matter what the Decepticon leader's name is - Thunderwing, Jhiaxus, Bludgeon, Ratbat, Liege Maximo, Deszaras, Devil Z, Octus, Legonis, Seizer, Zarak, Straxus or Violen Jiger - he'll almost certainly get exactly the same 'characterisation', i.e. none. The only time Megatron was even vaguely interesting in the first three films was when he was a beponchoed hobo. That said, I hope the rumour that the new films will feature 'a new line up' from the first three is true. Anything that distances and refreshes Transformers 4 (and 5) from the existing films will be an improvement.