He is an Ura who lived in Caelondia as an ambassador of peace and good will. Although initially desiring peace between the Ura and the Caelondians, he finds his pacifism challenged when the truth behind the Calamity emerges.
Having lost his parents to a plague at a young age, Zulf spent much of his early childhood struggling to survive as a petty thief. He managed to sustain himself by stalking and pickpocketing a Caelondian missionary but was eventually caught. Surprisingly, the missionary chose to adopt Zulf and raised him as family.
When the missionary died, Zulf wilfully inherited his mission to spread the message of peace and reconciliation amongst his fellow Ura. As his influence grew, Zulf decided to travel to Caelondia and follow in his mentor's footsteps. He fell in love with a beautiful Caelondian woman and eventually proposed to her at the Hanging Gardens. When she accepted, he celebrated the night away -- only to awake the next morning to the City in ruins.
Role in BastionThe Kid finds Zulf in the Hanging Gardens, staring helplessly into the sky. Because the Kid is the first survivor Zulf has encountered, particularly amongst the many petrified remains in the Gardens, Zulf is easily convinced to return to the Bastion.
He stays until all of the cores are found in the game. When Zia joins the group, she brings the Hidebound Journal that belonged to her father. Rucks is able to decipher a bit of the Ura script, but the only character that can fully read the journal is Zulf. While the Kid is away retrieving the final Core, Zulf finishes the journal, which reveals that the Caelondians intended the Calamity to be a final, devastating blow against the now-peaceful Ura. Outraged, he sabotages the Monument and leaves.
As the Kid gathers shards to repair the damage Zulf has done, he discovers that Zulf has united the Ura survivors, who are now seeking the shards themselves. The Kid finally speaks to Zulf for the first time after his departure at the exit of the Burstone Quarry. Warning the Kid to abandon his quest, it is revealed that Zulf has sent a force of Ura to destroy the Bastion.
Now contending for the last known Shard, the Kid is defeated by the Ura. As the final Shard is crucial to the Bastion's recovery, the Kid trails the Ura back to their stronghold in the Tazal Terminals, destroying the Conductors that are keeping the Ura territories intact.
thumb|right|300px|Mother, I'm Here (Zulf's Theme)When the casualties became too great, the Ura turn on Zulf and leave him for dead. The player is confronted with two options: either drop your only weapon to retrieve Zulf or leave his battered body behind and fight your way out of the Terminals.
If the Restoration Ending is chosen, he appears with his Caelondian fiancée, glowing with happiness. If the player chooses the Evacuation Ending instead, it is shown that Zulf atones by joining the Kid, Rucks and Zia on the ship, still haunted by the loss of his beloved and the Calamity.