He is like the goblin slayer, with "unnatural" training they've received... They were unable to become "normal". Their vocabularies, their skill, their attitude, all of that was because of their past. Goblin slayer was with that kinda "twisted" rhea, and this guy is with the assassin's guild...
Is this the one with :
This ain't a song for the broken-hearted
No silent prayer for the faith-departed
I ain't gonna be just a face in the crowd
You're gonna hear my voice
When I shout it out loud