Mads Mikkelsen

Since the rumor of Darth Vader’s appearance popped on the web, everybody started believing that Mads Mikkelsen will be the one to portray him. We highly doubt it.
First of all, since he was announced for Rogue One, Mads has signed quite a few autographs with the name Galen – who is known as being none other than the most famous pupil of Vader. But we doubt that the actor will bring Starkiller to life. Instead, we believe that this is just a hint for the arc of the character he’ll portray.
In The Force Unleashed, after being betrayed by Vader for a couple of times, Galen switched sides and embraced his Jedi origins, siding with the rebels. Basically, he was the one to aid the Alliance into making its first true steps towards the defeat of the Empire.
In a way, we believe that Mads Mikkelsen’s role from Rogue One will mirror this story. Thus, according to the same Making Star Wars website, this new character will be the one to come up with the design of the Death Star. However, after witnessing the atrocities the Empire commits, he joins the Alliance and helps them come up with a plan to destroy the super-weapon.
Which makes sense, seeing how easily the Death Star was destroyed. Who knows? Maybe this new character is the one to purposely come up with a faulty design…
