If you had to play a character in the movie series who would it be and why?

If you had to play a character in the book series who would it be and why?

For me it's Sirius Black for both because he had so much power and passion in his role...and of course such a heart wrenching death.

But let's be honest as soon as he posed the idea to Harry about moving into House Black you knew he was going to die.