Legolas is for me Godly Leggy
(with sarcasm, because I don't like him).
Aragorn is Arya (because before I called him Arry and that is nickname of Arya Stark).
Smaug is Smee, because I started to underline my mails with such pet name.
Bilbo is Mr I - do - everything better than dwarves
Thorin is Mr. I-swear-I-am-not-ungrateful.