Obsessions motivating "all actions"

[Stormcrow]

Originally Posted by Varyon

Under that interpretation, GS would have to have his Obsession at Quirk level - basically any time a friend asks him to do something non-goblin-related for them, he does it (or at least makes an attempt), so long as it doesn't get in the way of killing goblins. If he has to make a self-control roll to do anything that he doesn't rationalize as helping him with his goal, even having it at the (15) level is going to result in him acting out of character.

Again, I don't know the character, but if it's just a quirk then it's just a quirk, no matter how character-defining it is.

A character trait that strongly defines a character but has little game-mechanical or compulsory effect on them is a quirk. If Goblin Slayer can disregard slaying goblins whenever it's inconvenient, then yes, it's just a quirk. If his behavior annoys people, it's an Odious Personal Habit. If he just fervently believes that goblins must be slain, it's Fanaticism. If Goblin Slayer has sworn to slay goblins but his oath doesn't prevent him from doing other things, that's a Vow.

There's another question which answer I don't know: is Goblin Slayer's obsession with killing goblins a self-imposed mental disadvantage? Traits like Obsession and Odious Personal Habit are not self-imposed mental disadvantages; traits like Fanaticism and Vow are. How much free will Goblin Slayer has with his interest in slaying goblins will have much to tell about which trait is the right one for him.