NightStalker
Growly Growly.
I dont think he has chosen name of the loved one to be his fake name. In AFFC prologue we find out that when Faceless Man takes someone elses body he takes his identity also. What is the point of taking over body if u can't use his identity?
Also if he was afraid of dying because he had task to do could it be that task was to kill Baelon Greyjoy? Very posible.
About Arya's blindness, I think that is lesson she has to learn. She is not master of life and death, she is servant. I guess that blind kid made same mistake. He, like Arya killed som1 who in eyes of Faceless Man did not need to die. I think they have like some rules for killing people. I can think of 3 rules.
1. Kill only people who u have orders to kill.
2. If u need to kill some people in process do it.
3. If som1 save ur life (steals your life from Gods of death) pay him back with free kill.
1. Surely Baleon Greyjoy died 'by chance' because Stannis spoke his name to one of those beetles(?) before placing them in the fire.
2. I think the whole Arya being blind thing is part of her training, as the lack of one sense can improve others. Either that or it is some sort of {temporary?} punishment, as she drank milk made for Arya House of Stark.