One possible theme is unrequited love. Snape loved Lily deeply, and their Patronuses, both being doves perhaps in some fanfictions, could symbolize that love. His Patronus could be a constant reminder of his love for her, even though she was with someone else.
In a fanfiction, Snape's Patronus could be the key to saving Lily from a dark magic curse in an alternate universe. Since the Patronus represents love and protection, Snape's doe Patronus might be able to break the curse that has trapped Lily's soul. As he sends his Patronus towards her, it glows with a powerful light that gradually dispels the dark magic surrounding her.
Well, it really depends on the fanfiction author's creativity. Some might give her a Patronus that reflects her own unique personality traits. For example, if she's portrayed as very brave and fierce in a particular fanfic, her Patronus could be a lioness, representing her courage and leadership. Another possibility is that it could be a bird, perhaps a phoenix, which would tie in with the magical and powerful nature often associated with the Potter family.
One interesting Snape patronus fanfiction is 'The Silver Doe's Secret'. It delves into the significance of Snape's doe patronus and its connection to his unrequited love for Lily. Another is 'Snape's Patronus Revelation' which explores how his patronus might have changed over time due to different events in his life.
Snape's patronus being a doe in fanfictions often because it was his love for Lily that was a central part of his character. In the original story, his doe patronus was a symbol of his love for her. Fanfiction writers like to explore this aspect further, so they keep using it as it is such a powerful and poignant symbol of his unrequited love.
James' stag Patronus is a symbol of his adventurous spirit. Stags are wild and free, and James was always up for an adventure. It also reflects his protective side, as stags can be very protective of their herd. Lily's doe Patronus represents her nurturing side. Does are often associated with motherhood and care, which was a big part of Lily's character. Also, the contrast between the stag and the doe in their Patronuses is like the yin and yang of their relationship, showing how they complement each other.
One great Lily and James Patronus fanfiction is 'The Protective Patronuses'. It beautifully depicts how their Patronuses interact and protect each other. Another is 'Patronus Bonds' which delves deep into the significance of their Patronus forms in relation to their relationship. And 'Lily's Stag, James' Doe' offers a unique take on how their Patronuses might have played a role during their time at Hogwarts.
One great fanfiction could be where their Patronuses interact in a magical forest. Maybe James' stag and Lily's doe are drawn to each other, symbolizing their unspoken connection even before they fully realize their feelings. It could be a story filled with mystery and a touch of magic, exploring how their Patronuses are a manifestation of their souls.
The Patronus can be a way to show her growth. For example, if her Patronus changes over time in the fanfiction, it might represent her maturing or going through difficult experiences. If it starts as a small, timid animal and then becomes a more powerful one, it shows her development as a character.
One possible theme is loyalty. Snape's loyalty to Lily was unwavering, and fanfictions can explore how that loyalty manifested in different situations, like when he had to choose between the Death Eaters and protecting Lily. Another theme could be regret, as Snape may have regretted some of his actions that affected his relationship with Lily.