Sure. Some fan fictions could focus on the rivalry between Dr. Doom and the Fantastic Four, with Susan being a key member of the team. It could be about how they strategize against Dr. Doom's evil plans. There are also stories that might explore a more platonic relationship between Dr. Doom and Susan, like a begrudging respect that develops between them in the face of a common enemy.
One common theme is the power struggle. Dr. Doom is always after power and Susan has her own set of powers. Their interactions can be centered around this. Another theme could be redemption. There might be a story where Dr. Doom has a chance to change his ways and Susan is involved in that process. Also, the theme of sacrifice might be present, where either of them has to sacrifice something for the greater good of the Fantastic Four's world.
One of the best Fantastic Four stories is 'This Man, This Monster'. It delves deep into the concept of identity and how appearance doesn't define a person. It shows the Thing's struggle with his new form and the contrast with a character who desires to be like him. It's a classic that really explores the emotional depth of the characters.
It's tough to put a precise figure on it. The Fantastic Four franchise has a rich history of comic book releases. There are countless regular issues, spin-offs, and limited series. So, there could be thousands when you consider everything.
Certain variant covers or signed copies of Fantastic Four comics can be valuable. Issues that introduce important characters or have significant plot developments often command higher prices in the collector's market.
It's subjective. The Fantastic Four has its fans, but there are many other comic series that are also highly regarded. It depends on what aspects of a story you value most, like character development, plot complexity, or art style.