And you haven't received any replies to your posts with opinions and possible solutions? Every one I've seen have several but I can always go back and double check. We all seem to want the same thing, a fun and rewarding game experience. I'll admit, sometimes the rules get in the way or don't handle what is seen in the books exactly. That's why we house rule. Not all of the house rules are perfect though, but they can get the job done.

I personally created a couple of custom powers that allow for extra oomph when dealing with rote spells. I'll have to see if I can dig them up.

Yes, but you've managed to hit the mark well enough a lot of the time that you're basically the unofficial authority at this point.

I consider Sancta to be an authority on the mechanics of custom powers. Granted, it's me putting the weight into that authority, even when he's shot down some of my ideas. The responses are reasoned and thought out (which is more than I can say for some of my ideas )

Off topic, but part of a convo I had when I finished the last episode of Leverage on Netflix. If I ever had to cast a Dresden Files movie, Christian Kane (the actor who plays Eliot Spencer) is who I would cast as Jared Kincaid.

As Haru explains, some of the best ways to accomplish your goals are to ignore some of the restrictions and house rule it or use custom powers contributed by members of these boards. You said it best, the game designers aren't psychic and there hasn't been an update in years (where as we've had several new books by Jim expanding the flavor of magic). Just have to find a way to bridge the gap until Evil Hat can do it.

Not all demons use holy as a catch. Demon could be a catch-all category for various denizens of the NeverNever. I think Holy tends to work because it's faith. You believe it will work. I mean, technically the White Court's Hunger could be considered a demon (it's even kind of described as such) and they aren't damaged by Holy.

As for statting him up, I would give him veils with a limitation of Photography (he can only be seen through photos or video). That means the group will probably run around with high tech gadgets, thus handicapping them if they have a wizard or anybody who can throw serious power. If he'd use it in combat, I'd give him the teleportation power (from the DFRPG wiki) with a limitation of only through electronics. I wouldn't stat up jumping into the NeverNever, as that could be done by invoking his high concept for effect.

I'm not super familiar with Slenderman so I don't know anything else about him other than what I've listed.

For some back story stuff on why his Catch was blades previously but that is changed, it could have to do with who or how he was summoned to fight them the first time. Perhaps it was an imperfect or weak summoned form.

I've always been a little shaky on opposed maneuvers. If all 7 attempt to maneuver, couldn't the character defend against all of the maneuvers? Or does that count as an action?

I personally wouldn't let the player decide which powers are suppressed. I'd let the GM decide. After all, the player will just have to have Faith that his god has his back and won't give him a problem he can't handle (or help level the playing field)