Most often Spellcasters are the NPC that gets a little attention, since it's easier to characterize them in-combat due to spell choice and describing a little casting activity.
Also, not spending any number of hours - only a couple minutes. These guys are NPCs, they have lives outside of combat. Feats for martials are always Power Attack>Weapon Focus, and maybe something like toughness. If I've spent 30 minutes on a throwaway, it's too long