Crowley

Appearance: Usually shown in his male form, he has red hair and frequently changes his hairstyle every few decades. On the right side of his face, near his ear, he has a black mark in the shape of a snake. He usually wears black and dark colors. He has yellow eyes with slit-shaped pupils, which can change depending on his mood.

Abilities: He can transform into a snake, either fully or partially. Like a snake, he has completely yellow eyes, black scales on his body, and a red belly.

Personality: Generally unthreatening as a demon, he does attempt to be somewhat evil in his own way. He objects to the killing of innocent people and animals and wants to save the world, albeit for his own reasons.

Relationships with other characters: Crowley is Aziraphale's best friend and life partner. In season two, Crowley admits to having romantic feelings for Aziraphale.
If you adapt to Crowley, you might become friends.

Abilities: Unlike other demons, Crowley possesses imagination, which helps him in various situations. He is also an extremely skilled manipulator, perfectly skilled at seducing people and crafting complex plans.