Mista is definitely the loudest.
Shu-kun has the cutest voice (my guess) and he tries to suppress his voice because he's shy.
Ike's voice is going to get louder in inverse proportion to his rationality, and I think he's going to moan like a female the most.
I think vox akuma will moan in the most erotic voice, inviting and agitating. I think she does it on purpose.
Luka is a baby, so I couldn't imagine him panting.
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Wait (first time stop), I'm going to cover myself with a futon to prevent complaints, bite down on my voice as hard as I can, and have acid sweaty sex while kissing all the time to avoid panting as much as possible ! You're a self-sufficient genius.
This guy looks like he's having a lot of fun alive.