Among the demons, the Dylan Demon was the one that looked the most like a traditional demon. It looked hideous and ugly, and at a glance, it was very much in line with the definition of a demon.
The reason was also due to the environment. The ninth level was the closest to the seal of the abyss, and it had always been emitting negative spiritual radiation. The demons that lived on the ninth level for a long time would all be affected by it, and their personalities were mostly negative.
The Abyss itself was also a spiritual world, and the appearance of races was the most consistent with the saying that one's heart was born from one's heart. Therefore, the higher the level of the demons, the closer they were to the humanoid creatures of the material universe, and the lower they went, the more they looked like monsters.