Whenever I see Shu and his struggles, I think this quote exemplifies his character:
"Courage does not always roar. Sometimes courage is the small quiet voice at the end of the day saying,
"I will try again tomorrow."
As much as I liked Gurren Lagann and Gaogaigar, NOTHING comes close to Shu, Sara, and everyone else in NTHT for their stoic courage and perseverance when faced with the worst adversity and atrocity that humans can do to one another.