Rumors of a Supernatural renaissance have sparked various conversations, and loyal fans of the show seem to have already imagined the revived series and different scenarios that the protagonists Dean and Sam Winchester might face.
Jared Padalecki and Jensen Ackles have given interviews openly expressing their wish to come back to play the characters, perhaps in a limited series or a movie. Therefore, if Sam and Dean should come back, the big question would be who they would challenge (or rather, who would challenge them)?
Throughout its airing, which lasted for 15 seasons, Supernatural showed numerous terrible enemies of different sorts, some defeated and others still lurking somewhere in this world. The following list is about those five characters whose comeback to the show would most shockingly surprise the Winchesters.
1. The Shadow – The Nightmare from the Empty

The Shadow was unquestionably one of the most mysterious and scariest entities in the world of Supernatural. This dark and the void of nothingness were the places where angels and demons ended up not just dying but also being dead physically.
The final seasons saw it form uneasy alliances, most notably with Castiel, and its motives remain cryptic. The Shadow was more akin to a natural force of evil that was more likely going to hurt people psychologically, not to mention the power of its reality-bending as the only one it was capable of.
2. Chuck Shurley (God) – The Fallen Creator

Chuck’s God reveal twist had a real mixed reception. The worst of it was in the last season, where his transformation into a self-absorbed being of destruction while also being a narcissist stayed on screen a bit longer than was appreciated. After losing all powers and becoming untouchable and mortal, the latter half of Chuck’s narrative felt insufferably incomplete.
What if this pathetic god, decrepit and lost, tried to find a way to divinity? A ‘powerless’ deity wandering to regain dominion over the realm he willingly dissociated from doesn't just sound intriguing. It brings a lot of fight and thought. In his brutality and superior intellect waiting to spill forth, he would also bless the sideshop of issues to resolve with ideas of using free will, control vs. chaos—one of the absolutely necessary themes of Supernatural.
3. Asmodeus – The Southern Gentleman with Sinister Plans

Asmodeus—one of the Princes of Hell—took control when he stylishly managed Hell with a Southern drawl in Lucifer's absence. His strategically crafty side emerged when he released the Shedim, making a clear play for supremacy.
Even if one assumes Gabriel put an end to him, the smarter side of Asmodeus is the kind that will always have a fail-safe self waiting in the dark. His emergence from hidden fragments could spark internal conflict in Hell and remind them that not every danger is world-shattering. Sometimes it’s just a power grab.
4. Jack Kline – The Nephilim God

Jack, the offspring of an angel and a human, went through a transformative journey from a mere stranger to the embodiment of God through his righteous deeds. The positive side of his last acts—restoring order and justice throughout the universe—still leaves some room for quarrel.
Being a god comes with a lot of challenges. A reboot could focus on Jack's internal fight with the divine, such as the feeling of being the only one, the curse of being error-free, and the dangerous edge of the power. Can Jack, in his attempt to put things right, actually become another god? A storyline like that would pit the Winchesters against a former ally along with the crushing weight of the universe over them.
5. Lilith – The First Demon Still Casts a Long Shadow

Lilith was the first demon to be made by Lucifer, marking a pivotal turning point for Supernatural’s initial seasons. She was remarkably strong, plaque-filling, and critical in shattering the 66 seals required to free Lucifer. Although she met her end in Season 4, her spirit made brief returns in later seasons—showing that even death cannot hold Lilith back forever.
Her return in a post-Chuck universe could bring back the old lore. Would she do it with the intent of rebuilding Lucifer’s dominion? Or, even more dangerously, declare herself dominion as a queen? Either way, her return would be a bone-chilling reminder that demons were more sinister and scarier back then.
6. The Shedim – The Unleashed Chaos

In Season 13, the Shedim have been briefly mentioned but are referred to as "ancient, primal monsters so dangerous that even Lucifer was afraid to let them out. We only saw part of their abilities when Asmodeus was trying to use their power." A potential climax of a new season could be the revival of the Shedim. The idea that the Shedim's resources have been largely untapped could be a good reason for their return.
The example of the Winchesters is also reasonable: by now, they might be even more experienced and want to lead a normal life, but they are constrained to confront a mass of extraterrestrial creatures, which not only make demons look like a joke to them but also make them realize the fact that this is the reality now.
7. Amara – The Darkness Beyond Light

Amara, who is the depiction of Darkness and Chuck’s sister, was added as a scope character in Season 11. Although she ultimately made up with Chuck and assisted in restoring equilibrium to the universe, her story concluded with her inexplicably merging with her brother. Amara's scoop remains uncertain as Chuck has now lost his powers.
If Amara comes back, whether to exist solely or in combination, she could be from either side of the good-evil spectrum. Some revival focusing on her role after Chuck falls would deepen the philosophy that the Winchesters' fight was even for.
8. Death – The Pale Horse Returns

Death's personification is a timeless figure among fans of the show. The Horseman has maintained the balance between the two worlds and played a key role in the balance of life and the afterlife, whether in the original Death's calm and chilly demeanor or the chaotic ambitions of Billie.
After the galactic chaos has settled, who is the one to restore the natural order? When the Empty is falling apart, and bodies are lost, and the Creator is no longer on the throne, Death might have to play a bigger—if not darker—role. It is possible that a version of Death will come out, which would be angrier and more like a vengeful spirit—as a non-good but neutral creature, this will be enough for the terror.
Final Thoughts

Supernatural is finished. The series ended on an emotionally satisfying note, yet here remains the universe with numerous unexplained phenomena and uncontrollable forces. Should there be a revival, the opportunity to reintroduce these iconic but underutilized villains must not be wasted.
The source of inspiration lies in the threatening power of The Shadow, the defeated creator of Chuck, or the unexposed meaning of the Shedim. Such enemies would convert a restricted revival into a highly productive, character-centered epic that will have the double task of standing up to the show’s legacy as well as taking the show to darker territories.