Out of all of his friends, Max is the most "normal", which is ironic considering the upbringing he had to grow up in, although he has some quirks like everyone else, he's the closest to someone his age compared to everyone else in his friend group. 

For Max, he's pretty casual, that's all I genuinely would want for him, a sense of calm in the storm, not monotone like Liz but nowhere as excitable as Raf, the perfect middle ground.