The following are rough general guidelines for NPCs, broken down into the three traditional categories:

NPC Category	Description	James Bond examples	Build notes
Mook, minion	Grunts. Nameless hordes and gangs of opposition, there to be plowed through.	Most of the guys shooting at Bond, most of whom are taken out with one shot or blow.	The easiest is to just given them a level or two (Average, Fair) of "Thug" as an Aspect and use that for all germane rolls, winging everything else ("Library science -- lets' call that a Mediocre"). The idea is not to provide serious competition, but, in numbers, to provide a frisson of risk. See Mook Combat for more discussion.
Sidekick, Named NPC	Decent opposition, usually working for the head bad guy. One-on-one, usually of comparable ability (give or take) with a PC. More color than their nameless mooky brethren.	Grant, Oddjob, Jaws, Xenia Onatopp	Give comparable Aspect/Skill levels to the PCs, identifying the main ones. Probably don't need a full character build.
Arch-Villains, Brains, Bosses	The head honchos of plotlines. They may be personally formidable, or may simply have great resources gathered around them, but they usually require multiple PCs to take them down.	Goldfinger, Blofeld, Drax, Alec Trevelyan (006)	Anything from full Character Building, to simply giving them more Aspects than the PCs, the ability to use Aspects for rerolls if need be, and some key Skills.

Note that there are gradiations in all of this. There may be "chief thugs" who run a particular horde who are a tick or two better, but not PC-level. But these are useful general guidelines.