Welcome back to Humor Nation. Did you know there are numerous ways through which one could become a demon. Easiest would be to be condemned to hell, one can also make a deal with another demon. After becoming a demon, they appear in the form of black smoke. The only demon who has a red smoke cloud is Crowley. We have never seen the true forms of the demons.
So Take A Look At 6 Interesting And Unknown Facts About Demons From Supernatural
6. THE EYE COLOR

As know that that different kinds of demons have different colored eyes. The eye color symbolizes their power, position in the demon hierarchy. But did you know Belphegor, a demon introduced in the final season of Supernatural is an eyeless demon, his eye color was never revealed. Along with Belphegor, Cain is another demon whose eye color was also shown to the viewers. Belphegor is a low-tier demon who belongs neither to the ordinary black-eyed group or the crossroad red-eyed demon group.
5. RESURRECT DEMON

Well, nothing truly dies in the Supernatural Universe. But earlier, we believed that once an angel or a demon has died, they cannot be brought back. Although Castiel seems to be the only exception, as he’s one angel who has been resurrected numerous times. We later learned that when an angel or a demon dies, they go to a place named Empty where nothing exists and they sleep forever. However, Lilith became the first demon who was resurrected by God in Season 15.
6 Interesting Facts About Supernatural That The Fans Might Not Know
4. SPECIAL DEMONS

Apart from the prince of hell, knights of hell, white-eyed demons, there exists another class of demons who the Winchesters have encountered. They are the special demons. This group includes Samhain, he is a multicolored eye demon, the originator of Halloween. Then we have the seven deadly sins who are the notorious sins taking a physical form. Then we have the disaster demons who are capable of causing different sorts of disasters. Daeva is a shadow demon who doesn’t require host and can be uncontrollable. Acheri is another non-host requiring demon who poses as a young girl. Dever or Reshef is the creator of the deadly Croatoan Virus as shown in the alternate Universe episode in Season 5. Apart from all this, there is Jesse Turn who was born when a demon possessed a human woman. He is believed to be the Antichrist.