Vergilius is lke the caretaker of a bunch of rowdy children. He is routinely thrown itno complications based on their distinct inability to complete missions the appropriate manner, and has grown weary of putting up with these shenanigans unfolding. As the Guide of Limbus Company group B, he is contractually bound to continue this penitence for whatever mistake led him here.

 Vergilius' voice is medium in pitch and extremely raspy. He sounds like a chronic smoker and has a harsh grip on the throat when he speaks (not literally). I'd imagine Blade from Honkai: Star Rail for his voice, but a bit wiser and less melodramatic if you wish for another reference—more rasp, less gruff.

Vergilius' voicelines/reference can be found here.