Max ( maxwell) Minx is obviously is the gederbent version of Maxine

Y'all can imagine him just like a gender bent Mia goth but there are some people that I have in mind as face claims for max

I
Michal mrazik,Louis partridge,or maybe even a young Tom welling

But the main one that I think fits it the most fitting face claim is Chase  stokes as John B  from outer banks

And voice claim wise maybe Charlie heatons  voice in the new mutant movie or maybe Kurt Russell's voice as older copper in fox and the hound