To quote Abraham Lincoln, 'Now it's time to make my introduction on the internet. Boo-yah!'
I'm J, and this bald fella is Walter Vervain. He was born to a pair of apostates and taken into the Circle to learn magic and stuff. After spending a long time there, he weighed up the pros and cons, then decided he wanted to leave and politely informed the senior enchanter that magehood wasn't right for him. Nah, actually he killed a bunch of people, destroyed his phylactery and ran the hell away.
For those of us in the business of looking up TV tropes until being declared legally dead, he's a Retired Complete Monster. He hates the Chantry, and once had the goal to kill the Maker himself by going deeper into the Fade than anyone ever has. He wants to be powerful enough to do it and not become a Darkspawn, although quite frankly he's grasping at straws. Magical, evil straws.
So, to conclude, hello! I am J! This is Walter! He is bad! There are straws involved!