Unless you really don’t want him (and tell him that about five times), Virgil will automatically join your party when you start the game. Since he’s a healer, Virgil is a useful companion to have around unless and until you reach a technical aptitude of around 35 (then his spells will generally fail against you).
Virgil is the most interesting follower in the game. He has a history that you’ll slowly discover, and he adds the most dialogue of any of the followers.
