Stolitz.

Stolas is a tall, lanky, aristocratic owl demon, known for his distinctive appearance with large, four-eyed owl face, white heart-shaped facial disk, red eyes, blue feathers, and long black limbs with claws, often seen in regal attire like a tophat and burgundy cape. Based on Goetia demonology, he's a Prince of Hell who loves astronomy, plants, and has a flamboyant but lonely personality, driven by his desire for love and his secret affair with Blitzo.

Blitzo (pronounced Blitz) is the crimson-skinned, white-haired imp protagonist of Helluva Boss, characterized by his jester-like appearance, white skull markings, and curved, striped horns. As the founder of I.M.P., he is a narcissistic, sarcastic, and often reckless assassin, hiding deep insecurity and a fear of abandonment behind a chaotic, sometimes abusive exterior.