So far when I've gotten Eder it's been at level 3, and he's already taken Weapon Focus Ruffian for his 2nd level talent. 

 

Does anyone have the build progression of all the named PCs that the game would take 'naturally', so what Eder would look like at level 4 if you got him later on, that sort of thing?

 

 

I know this isn't what you asked, but you can go into the Options Menu -> Difficulty -> Unhook "Auto-level Companions". This "resets" any companions you recruit to lvl 1 and you can distribute points, talents and skills yourself. 

 

Don't misunderstand when I say reset to lvl 1. If you recruit Eder at level 5, he will be lvl 1, but with 4 lvlup processes where you can pick and choose talents and skills.