Not sure, but whenever his Confidant rank got to like 6-7, I thought everyone would love him. His story is tragic and he is trying to find somewhere he is needed, however this turns to list for fame. His story is one of my favorites, and the first time I met him (blind as a bat), I was so excited to see him join the team! Granted he did so in a different way, but without him then the Thieves would've been horribly unknown and the main story would've been much different.
TL;DR:
Click to load png image (size - 164 kb)