Will isn't neat 
Pretentious too, in my books.
Wouldn't that be true of all of them? 
Have we had confirmation/disconfirmation of will's messiness/sloppiness?
And, he's an 'artist.' That makes him pretentious by default, but she's pretentious too if she needs him to read, so I think he might be sub-unbearably-pretetious threshold.