I totally missed Armed Arts while I was reading stunts. Simple, often improvised weapons is why I gave him the Weapons skill, but this works so much better, since I don't see him using them all that often unless he is really pressed for a little extra oomph. So I'm switching Killer Blow for Armed Arts, and I subbed in Scholarship for Weapons. I considered Discipline, but I don't picture him being disciplined enough to actually have the skill at anything beyond the baseline Mediocre level. I picture this guy as only being around for about a year, so he's still working on that whole "emotional restraint" thing. You could also make the same argument for Scholarship, considering he hasn't exactly had a teacher, but he did have all that time with the textbooks, and as I've bumped Alertness up to Fair and lowered Scholarship to Average, I think it's a good representation of his roughly high school level booksmarts. Whereas he hasn't had a huge amount of exposure to overtly disciplined people. He lives in the red light district, which exists mostly because people can't be disciplined enough to resist the temptations it offers. If he develops along a certain path, I could absolutely see him getting Discipline as the result of a massive story and a Significant or greater milestone, but I don't see him starting with it. Also, he does have Lore at Average, which I think fits his one year of fighting supernatural things that prey on his charges.
I also see what you mean about Helps the Hopeless, DMW, and that's what I was imagining for him, so I think that's going to be the Aspect he gets for his First Story. And I've now edited those changes into the quote block on the previous page.