A powerless Lucifer could survive among humans by using his charm and intelligence. He's been around for a long time and has a lot of knowledge. He could use that to blend in and perhaps find some humans who are willing to protect him out of pity or curiosity.
If Lucifer is powerless among humans in Supernatural fanfiction, he might survive by hiding his true identity. He could pretend to be an ordinary human. Also, he could use his past experiences with humans to his advantage. He knows how they think and behave, so he could manipulate situations to stay safe. He might also find a group of outcasts or misfits who accept him for who he is without knowing his true nature.
If in a Supernatural fanfiction Lucifer becomes powerless among humans, first of all, his entire view of the world would change. He has always been at the top of the power hierarchy, looking down on humans. But now, he's in their shoes. He'd likely be in a state of shock initially. Then, he might try to find a way to regain his power. But in the process, he could form unexpected alliances with humans. Some might see him as a fallen being in need of help, while others would be out to take advantage of his weakened state.
In this type of fanfiction, a powerless Lucifer might start to experience emotions in a more raw and human way. Without his powers, he's no longer the all - powerful being. He could become a target for his former enemies who see this as an opportunity for revenge. This could lead to a series of adventures where he has to rely on his wits rather than his strength. He might also start to question his own identity and purpose, which were so closely tied to his power before.
Another plot could be that he is captured by a group of hunters who plan to keep him powerless. They try to use him as a bargaining chip with other demons or angels. But Lucifer, being clever even without his powers, tries to turn the situation around and manipulate the hunters to his advantage.
It could start with Lucifer waking up in a strange place, realizing his powers are gone. Then, he's immediately confronted by a character who has long hated him. This character decides to take advantage of his powerless state and starts the spanking as a form of revenge. For example, it could be a demon who was once under Lucifer's thumb but now has the upper hand.
One idea could be that Lucifer has his powers stripped by a powerful spell cast by a group of witches. As a result, he's in a vulnerable state and some other characters, perhaps angels who have a bone to pick with him, decide to teach him a lesson in a rather unorthodox way like spanking. It could be a humorous take on the usually intimidating Lucifer.
Maybe he wants to see different interpretations of the Supernatural world. Since he has his own perspective in the show, fanfiction might offer new and interesting takes on the characters and storylines.
In some fanfictions, it could be a powerful angel. Since Lucifer was an archangel, an equally powerful angelic being might be seen as his mate, perhaps one with a unique connection to him from before his fall.
In fanfiction, God can be characterized as more fallible. He might be shown as having made mistakes in dealing with Lucifer. Lucifer, on the other hand, could be seen as more sympathetic. For instance, he might have been pushed to rebel because of God's actions.
Well, in some fanfiction, Lucifer's daughter might be a key to a great prophecy. Her existence could tip the balance between good and evil. She may have unique powers like the ability to manipulate time or read minds. However, she is constantly hunted by both angels and demons who want to use her for their own purposes. She has to navigate this dangerous world while also trying to understand her place in it and what it means to be Lucifer's daughter.
Not really. Given that he is a character who is interested in the affairs of the Supernatural world, fanfiction can be an extension of that world. It's just another way for him to engage with the story and the characters.