Hello fellow Sinners smile

My first post here and thought I'd start with a scream for help.

I bought the game during the Steam Summer Sale and haven't gotten to it yet and want to start playing it this weekend. I read you can set your 2nd character on AI or that you can control his/her dialogue. Are there any advantages / disadvantages to this choice?

Bonus question:

If I pick "Lone Wolf" will I play the campaign with only 1 character? And is it even remotely possible to play this game with only 1 character?

Many thanks in advance!

// Nr|Five