Originally Posted by Maximuuus
I'd like they allow us to custom origin companions as much as possible at the character creation depending what is story driven for each of them (abilities, subclasses for some, chosen spells, fighting style,...).

I.E Shadowheart's deity has to be Shar but I guess she could be light or life domain.

Anyway I'm surpised no one has an answer.
I hoped cheaters or modders could have helped me.

Unfortunately even if they allowed customization of origin companions, Shadowheart would have to remain Trickery or Death as those are the domains of Shar. Anything else would go against the established lore.