Sharing some of the insights I've found for the companions in the game. I'm not planning on posting any Mercenary or MC builds here, just suggestions on different ways to build or use your Companions. As both a roleplayer and rollplayer, I strive for two standards in each build.
1. It has to be conceptually appropriate. Sure, you could technically
make Amiri a Cleric of Erastil for the OP Animal Domain, but canonically she's a follower of Gorum. My builds need to suit the character's concept most of all.
2. They have to be effective. I only post builds that I've personally used on Challenging or harder difficulties and can verify that they pull their weight. I've noticed a LOT of builds get posted out there where the character is a walking liability that contributes nothing until level 15+ when the uber-awesome combo it was building toward takes affect. My builds aim for showing meaningful gain and ability throughout every level.
Amazing builds. Would you consider doing them all again but using the Respecialization mod at Nexus, so you can repair the illogical starting stats, and other config issues, etc while still remaining conceptually appropriate?