Max is completrly androgynous/gender-ambiguous. They use they/them pronouns and when asked about their gender they just laugh. They're very friendly and nice, and, to be honest, they're the biggest cuddler this side of the Mississippi. They're extremely loyal and would die for their friends.

For Max's voice, I would definitely prefer someone with a more androgynous voice, though if I had to choose between it being more feminine or more masculine, I would say feminine.