Vassago is an avian demon in the Helluva Boss series, belonging to the Ars Goetia. He has a distinct appearance, resembling a Scarlet macaw with red feathers, a white face, and a black beak. He also has long, purple-gold feathers on the back of his head and wears a red suit with white gloves and a yellow crown-like visor. Vassago is known for his sense of justice and fairness, disliking injustice and Andrealphus's condescending attitude. He is also shown to be supportive of Stolas and his singing, even when shocked by Stolas's confession. 

Personality:

He is portrayed as a high-strung but mindful demon who values justice and fairness. Vassago dislikes injustice and Andrealphus's arrogance, especially when it comes to Stolas. He is also shown to be supportive of Stolas and his singing.