Virgil

Virgil is the first NPC to interact with the player in Arcanum: Of Steamworks & Magick Obscura. He is a follower of Panari religion, a religion dedicated to the worship of a mighty elf called Nasrudin who supposedly is going to be 'reborn on wings of fire' in a place shrouded in hills. Virgil meets the player in the crash site of IFS Zephyr zeppelin near a town called Shrouded Hills and believes that the player is the Living One, -or in other words, the reincarnation of Nasrudin- and offers to join him. He is the first companion to join in the player,  if the player chooses to have him in the party.  

Virgil is one of the most complex companion characters to appear in a role-playing game. Since he worships the player, his personality is heavily affected by the personality and actions of the player (similar but simpler mechanics were used for the companions in StarWars: Knights of the Old Republic II: The Sith Lords). After the completion of a certain optional quest in the game, Virgil undergoes a complete overhaul which turns him into a rather different kind of person.