Castiel, the angel, is also a common character in such scenarios. He has his own reasons to want Lucifer punished. As an angel, he stands for the good in the 'Supernatural' universe and Lucifer represents the ultimate evil. Castiel might use his angelic powers to assist in Lucifer's punishment, or at least be part of the group that decides on the punishment.
Definitely Sam and Dean Winchester. They are the main protagonists in 'Supernatural' and have a long - standing feud with Lucifer. They've fought him numerous times and would be the most likely to be involved in his punishment. Their motivation would be to protect the world from Lucifer's evil plans.
Chuck, or God in the 'Supernatural' series, could also be involved. Since he is the creator, he has the power to dish out punishment to Lucifer. He might decide to finally put an end to Lucifer's reign of terror by imprisoning him or taking away his powers completely. His involvement would add a whole new layer of complexity to the fanfiction as it would bring in the aspect of divine justice.
One popular storyline could be Lucifer being punished for his past deeds by the main characters in the 'Supernatural' universe. For example, Sam and Dean might use some powerful magic or a special weapon to confine Lucifer and make him suffer for all the chaos he has caused. They could send him to a desolate dimension where he has to endure constant pain as a form of punishment.
In some fanfictions, Lucifer might be punished by being trapped in a desolate dimension. This is often a way for the writers to show that even a powerful being like him can't escape justice. For Crowley, he could be punished by losing his demonic powers. It makes sense as his powers are a big part of what makes him a threat in the Supernatural universe.
A common theme is the battle between good and evil. In both Supernatural and Lucifer, this is a central concept, and fanfictions often explore it further. For example, how characters are tempted by evil or strive to do good in difficult situations.
One common theme is the clash of powers. Lucifer has his own set of demonic powers and in the Supernatural world, there are various powers like the Winchester brothers' hunting skills and the angels' powers. So, how these powers interact is often explored.
One common theme is redemption. Often, the presence of a soulmate makes Lucifer question his actions and strive for redemption. Another theme is the power of love. The connection with the soulmate is so strong that it can overpower Lucifer's demonic nature. And also, there's the theme of fate. It shows that even a powerful being like Lucifer is bound by the concept of a soulmate which is pre - determined by fate.
Power struggle is a very common theme. The idea of Lucifer being a powerful entity and the use of bondage to either restrict or enhance that power. For example, in many fanfictions, the hero might try to use bondage to limit Lucifer's abilities.
Redemption is often explored. In Supernatural, many characters are on a journey of redemption, and when Lucifer is added to the mix, the idea of whether he can be redeemed or not becomes an interesting plot point. For example, some fanfictions show Lucifer being influenced by the Winchesters' sense of justice. Another common theme is the disruption of the natural order. Lucifer's presence in the Supernatural universe throws a wrench into the already complex balance of good and evil, heaven and hell, that exists in the series. This can lead to all sorts of chaos and interesting story developments.
Power struggles are common. Both shows deal with powerful beings, so in the crossovers, there's often a fight for dominance between the characters from each universe.
One common theme is redemption. Since Lucifer is often seen as a villain in Supernatural, many fanfictions explore the idea of him finding redemption through his relationship with his mate. Another theme is power. The combination of Lucifer's power and the role of his mate in relation to that power is often explored.
Redemption is also a theme. Some fanfictions might depict the female Lucifer trying to atone for her past wrongs or find a way to be something other than what she was originally created to be. This could involve her interactions with the main characters like Sam and Dean. She might try to help them in their battles against evil as a form of self - redemption. It often makes for an interesting character arc.