With the fact npcs now have a base chance skill level of 5 in untrained skills (and taking inspiration from points found across the forum), i cobbled together a sheet to figure out attributes for npcs. It might not be perfect, but it works in a pinch. I have posted this on different threads but i'll make a summery of it here.
STR/AGL
An Npc's STR/AGL is based on what Damage Bonus Die they have.
None: Default to a 9.
D4: 13
D6: 17
(You can give the npc different STR/AGL if you want to. Consider, however, to do this primarly towards noteworthy npcs)
None: 9-12
D4: 13-16
D6: 17-18
CON.
An NPC's CON is equal to their maximum HP value, excluding any points gained from the ROBUST heroic ability.
WILL
An NPC'S WILL is equal to their maximum WP value, excluding any points gained from the FOCUSED heroic ability. If they do not have any WP listed, default to a value of 9.
What about INT/CHA?
Sense there is no mechanic that specifically requires INT/CHA, and npcs should not make rolls unless it directly affects the players (aka combat), it is currently not necessary to list these for now.
Why default to a 9?
Sense the Skill base chance is a 5, this would mean on a player character they have an attribute value of 9-12. I opted for 9 as it means it gives the player a slightly bigger chance of success, but it still gives mages a reason to opt to pay more WP when casting spells such as Ensnaring roots.