There probably is. Supernatural has a large and active fanfiction community. Writers often take the characters and put them in unique situations, so it's not surprising that there could be fanfiction centered around Sam as a Stanford lawyer. You could also try reaching out to Supernatural fan groups on social media to see if anyone can recommend some.
Common themes often revolve around the relationship between the two. As mentioned, mentorship is key. But there are also themes related to self - discovery. Stan as a child might be finding out who he is with Ford's influence. And then there's the theme of loyalty. In fanfiction, they might face challenges that test their loyalty to each other. It could be a situation where Ford has to choose between his research and protecting Stan, or Stan has to prove his loyalty to Ford in the face of danger.
Well, often you'll see themes of identity. Sam was already a complex character, and adding the Stanford lawyer aspect gives another layer. There could be themes of secrecy too. He has to keep his supernatural life a secret from his law colleagues. And also, there might be themes of redemption. Maybe he uses his legal skills to right some wrongs in the supernatural world that he feels responsible for due to his family's past in hunting.
There are indeed. You could search for ones that delve into the backstory of their relationship. For example, a fanfiction might show how Ford's actions as an adult influence Stan as a child, like inspiring him to be interested in the mysteries Ford is involved in. This can create really interesting storylines that show the development of their connection over time.
There's also 'A Dipper - Ford Adventure'. In this fanfic, they embark on a quest that tests their friendship. The story is filled with exciting plot twists and great character development, especially in showing how their relationship evolves over the course of the adventure.
The theme of friendship and its boundaries also shows up often. Given the complex relationships between the three characters, fanfictions may explore how far friendship can go when one of them is an otherworldly being like Bill. There could be stories about trust, betrayal, and the lengths the characters will go to for each other.
Another theme is self - discovery. As they interact with each other, both Bill and Ford learn more about themselves. They might realize their own strengths and weaknesses through their experiences with one another. This theme adds depth to their characters and the overall story.
Character interaction is a key element. Since Ford and Rick are from different universes in the original concepts, seeing how they interact in fanfiction can be really interesting. Their different personalities, Ford's scientific curiosity and Rick's more cynical yet brilliant mind, often lead to engaging exchanges.
One common theme is the exploration of their intellectual connection. Since both are intelligent characters, fanfictions often focus on how their minds interact.