I'd say yes, with the caveat that such aspects will expire after a time. You couldn't set up that ready for anything and invoke it the next day, for example. If your character has a nap, you'd have to re-establish it with another roll. Similarly, if your character is on midnight guard duty and going into his seventh straight hour with no breaks, the GM might call for an endurance roll to keep the aspect.

Basically, yes, but the rules do specify that these aspects are temporary, and the duration should depend on what makes sense to the group.

This is the kind of thing I always let my players handle. They're the ones piloting their characters, so they would know best how to justify things like that. Besides, they all WANT to play, otherwise they wouldn't be there around your table. So I just let them guide themselves in that regard.

Oftimes this ends up with us spending half the session at each other's throats, but that's half the fun of playing, anyway.

I see RAI used more often on boards that discuss Dungeons and Dragons and other such games that have substantially more rules and rules-interactions than Dresden Files.

For example, in D&D 4th Edition, RAW says that Dwarves move 1 square less whenever affected by a Push or Pull effect (effects which force involuntary movement). This represents their natural stability. The rules also state that a character who finds himself in mid-air without support or flight is Pulled (note the use of a defined game term, with a capital letter) toward the ground at a rate that depends on how far above the ground they are.

Thus, a dwarf who can arrange to place himself 1 square off the ground will be Pulled 1 square downward, but resist it and be Pulled 1 less square, for a total movement of 0 squares.

In other words, by RAW, dwarves are hovercraft.

This is clearly not RAI.

I haven't heard that one, but I have heard of the commoner railgun. Take the Leadership feat and gather a large following of level 1 commoners, and have them all bucket-brigade-style pass something from one person to the next. Since passing is a free action, you can effectively move anything any distance in literally 0 time.

Arguments have been made that the speed at which this object passes requires it be a deadly projectile beyond the 1d4 of improvised weapons.

PS
Why do I have to enter a capa and answer a question when I post?

Probably because it's your first post. Prevents spambots.

Shouldn't happen a second time.

It was more just an example off the top of my head. I'm more looking for general solutions, like the invoke example, rather than case-by-case.

My group got to have a little fun last night. We fought Smurfs!

We have a quartet of pixies in our employ who we saved some time ago and are using to keep an eye on things. But they've been captured! And the place they're being held is far too small for us to get to (the cave entrance was only three apples tall!), so we had to be shrunk down, temporarily, through pixie magic!

(I didn't give anybody "diminutive size," though, since everything was small so the sizes were all the same).

The "smurfs" were Blue Court vampires, who incite emotions of gaiety and revelry, feeding on that the way Whites feed on lust (the Catch was true happiness, i.e., complete contentment in one's life, the kind of thing you only get as a new parent with a well-paying job and a loving spouse sorta thing; nobody in our group). And when the energy has been siphoned, instead of dying, you become one of them.

There was also a red-hatted vampire leading the village, who had sat invisibly atop one of the "mushrooms the size of houses" during our fight with his elite guards.

One of the guards was a wizard who, through a quick series of invocations and lucky rolls, ended up with me having to say: "‎The vampire screams and tumbles from the tree, dead before he gets to cast any of the cool spells I've written up" 

Another was a weresquirrel. A gigantic squirrel the size of a mammoth with ursine paws and teeth of a tyrannosaurus. Seriously, I statted up the weresquirrel with the Hulking Size power.

It ended with us negotiating a prisoner return, on the grounds that there were hundreds of them in the village, but they'd take a great toll on their numbers trying to take us down before they finally overwhelmed us.

So they let the prisoners go, and one of our characters went back the next day and bug-bombed the whole place.

(I did warn them, though, that the Blue Court story wasn't over, and we'd someday meet Gargamel).

just wondering does he actually look like an ape or normal.

Here's how Harry describes him:


Then there's a paragraph basically saying how scary his size is.