Brujah of the 10th Generation, a Childe of Cosmo, who is a Childe of Ecaterina the Wise. He is Ecaterina's servant and a rather unusual Brujah, recognised by his calmness despite his action oriented nature. He teaches Christof the basics of being a Cainite during his first missions. Besides his standard Brujah disciplines of Potence, Presence and Celerity he also has knowledge of Protean, a discipline characteristic to the Gangrel Clan.
He rejoins Christof in his adventures in New York. During the time of Christof's torpor from the Dark Ages to modern days Ecaterina and the Promethians have eventually joined the Sabbat, a Vampire sect that views mortals as simple cattle. Despite his allegiance determined by the relations of the Promethians with the Ventrue, Wilhem appears to have managed to preserve a good part of his humanity.
- Common : He has four dots in Feed, Blood Healing, Blood Strength, Stamina, and Dexterity. Three dots in Awaken, and none in Walk the Abyss
- Celerity : Three dots
- Dominate : Three dots in Command and Mesmerize
- Obfuscate : Four dots in Cloak of Shadows and Mask of a Thousand Faces (yuk) and three in Cloak the Gathering. This is enough so that, if he casts Cloak the Gathering first, his Cloak of Shadows can enable him to leave the coterie behind and attack any enemy in the game without them being able to see him, even ones with Auspex.
- Potence : Four dots
- Presence : Awe, four dots. Three in Dread Gaze and Entrancement, and none in Majesty