And where does your main character fit in?
I'm tempted to pick an origin character from one of those four and in this case based on my deduction I' d probably be tempted with picking Shadowheart as I feel that the main character should probably also be the vocal point.
On top of that, with regards to the feat. "War Caster", it might be useful to pick Shocking Grasp, as this is the only spell in BG3 that can be cast as a reaction, which is not something I can choose via respec for Shadowheart when I don't pick her as my main.
