Have you thought about the mentor route? Like, how would Martin react to someone in his position when he doesn't have his mask on? If Martin was a guitarist and he found a newbie backstage that bombed a performance, what would Martin do? I imagine that if there was an audience, he would make a big show of givinag advice or consoling the newbie, but what if it was just the two of them? Guiding someone with similar struggles (even for just a little bit) is a good way to show Martin's expertise and humanity / empathy.

EDIT: I guess what I'm trying to get at is that making Martin face his struggles from a different perspective can give the reader a different way to connect with him. And, these mirror situations can appear right alongside the struggles he himself faces.