I can't imagine Adonis coughing/wheezing (but that would be a hilarious twist XD) I'd like to imagine his voice having that rough edge, hinting at vocal cord damage, but it gives off a seasoned vibe instead of sounding sickly (hopefully that makes sense LOL.)
As for Rosario, he really has a gift for adjusting his voice to match the moment— not in a camouflage-like way as with Merka, but more about connecting with others and meeting their emotional needs because he wants to love and be loved. When he’s looking to inspire, that mid-high ascending melody is perfect for uplifting his listener. On the other hand, when he needs to be more critical, a descending tone from high-mid adds a nice touch of disappointment. And during flirtatious or NSFW moments, his sultry mid-deep voice brings a warm intimacy while still keeping that sweet melodic quality~~