Some good people at the IRC chat gave me the idea that maybe the emo nature of the Utwig is simply a result of wearing the Mask of Ultimate Embarrasment and Shame, and when they will have other masks, they will gradually become more "normal" (i.e. with a Countenance of Stellar Representation, they have a sound, arrogant voice; with an Expression of Ultimate Gratitude, they have an EVEN MORE ANNOYING obsequious voice etc. -- and maybe the Saintly Facade will also have an effect on The Captain - maybe the masks are impregnated with drugs or something similar.).
But only to an extent. Unless you think they haven't gone to the bathroom for the last few years.
Maybe that's why they have that brown skin - I mean, it's not naturally so, you understand... Now, seriously, yes, not to such and extent. But, anyway, if you've been mourning for the past few years, you simply can't get rid of that cry-baby voice so easily. Also, mask etiquette is deeply buried in the mindset of every Utwig, so the association between mask and donning occasion is so high that one could expect an Utwig to immediately feel the need of going to the bathroom if he just dons the Mask of Natural Bodily Excretions (having very recently gone to the bathroom).