Shuichi Aizawa is oddly intense . He has a hair trigger and is willing to jump to action at a moments notice. He isn't as compassionate as he was in the original series, but I think that makes him more lovable. 

For voice: Again, a simple average adult male voice (perhaps with a smidgen of frat boy vibes) should work nicely, though I encourage creativity.

Like Raye Penber, Aizawa only has a handful of words to speak in his first appearance, however he will feature prominently in future installments. Unlike Raye, he has no active involvement in episode 2 however, instead first appearing in episode 3.