I've said this before and I'll say it again. When casting for a superhero film, cast an talented up and comer who is comfortable behind a mask for the majority of a film and can act with their voice. They're out there.
Hardly an 'up-and-comer', but to this day I remain impressed with the nuanced performance Hugo Weaving delivered as V (in 'V for Vendetta', of course) with only voice and gestures. But then, I've always thought Weaving has a great voice.
Fictitiously yours, Trent Roman