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UPDATE
Patch 2.2.0 broke all voice packs so this is an updated file.  I couldn't simply update the old mod page since I've deleted that original account.  Sorry for the trouble.
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Eder is a popular companion character from Pillars of Eternity 1 and 2.  He's voiced by Matt Mercer.
https://www.imdb.com/name/nm2233310/

Only 1 variant this time with no references to the PoE setting.  About 108
unique lines or grunts out of 119 potential slots (reused sounds are
only in the whisper category).

Version 1.1:  There were a few mistakes with version 1.0 since unlike the others there was no
documentation for this particular voice set.1 selection, 1 move, 2 crit
and 1 power attack bark(s) have been fixed.
Version 1.1A: 1 power attack fix and 3 new short exert barks that were formerly duplicated
(non verbal grunts from 2 different sources).

Installation : 

• Download the mod and open the zip file.
• Navigate to *Pathfinder Wrath Dir*\Wrath_Data\StreamingAssets\Audio\GeneratedSoundBanks\Windows
• Create a back-up of PC_Male_Optimist_GVR_ENG.bnk
• Copy the modded PC_Male_Optimist_GVR_ENG.bnk from the zip file to the directory (*Pathfinder Wrath
  Dir*\Wrath_Data\StreamingAssets\Audio\GeneratedSoundBanks\Windows) and overwrite.
• (Optional portrait) Copy the "Human Eder" Folders to your "Portraits" folder.
  

Thanks to u/Rational_Drunk for the guide to modifying sound files in PF:
https://www.reddit.com/r/Pathfinder_Kingmaker/comments/9u9ldw/tutorial_on_how_to_modify_sound_files_in/
And here's tPoncho's updated guide and mirror for the python script in case others are looking:
https://www.nexusmods.com/pathfinderwrathoftherighteous/articles/4