I have a little treat for you first, the voice of Nicolas! Well, kinda sorta. 

[X ^ This is model Tomek Szczukiecki who looks hella more mysterious w/ his face cropped like dis]

@devilsviolinist​ had posted this audio clip of Nicolas’ normal/contented voice, and @colourful-jack​ informed us that it is in fact ballet dancer Jonathan Klein [audio from this vid here]. While Klein does not look at all like Nicolas, listen to the audio clip, the voice is great!

I have to consider the others some more but I didn’t want to make you wait any longer for at least some reply ;]