Bio: Julien was the son of Marius Boudreaux, head of the New Orleans Assassins Guild, and Belladonna's brother. As the heir of the leadership of the Assassins Guild he gained the powers of enhanced strength, speed, and reflexes as well as razor edged talons from Candra.
Not wanting peace between the Guilds, and hating the idea of Belladonna being with Remy, he challenged Remy to a duel on their wedding day. There have been hints that this hatred came from either incestuous or extremely overprotective feelings towards his sister. Remy ended up seemingly killing Julien and was banished from the Thieves Guild and from New Orleans in order to keep the peace that they had worked so hard to create.
Julien was brought back to life by Candra and the Elixir of Life, although the side effects made him even more insane than he was before he had almost died. Due to this insanity and the fact that he was addicted to the Elixir he worked against the Thieves and the Assassins, intending to claim the leadership from his father, the Elixir from the Thieves and Belladonna. He arranged the killing of Henri LeBeau and was killed by his father after having shattered the vial of Elixir in Remy's hand.