Peter Parker is one of the main characters. He has a deep connection with Gwen. Her father is also important. He's often concerned about Gwen's safety in the dangerous world of the comic. And there are the villains like the Green Goblin who play a major role in the story.
Yes. Gwen Stacy's death is a well-known plot point in the comic world. It has had a lasting effect on the narrative and the development of other characters.
Gwen Stacy's death in the comic was a result of a cruel twist of fate. The Green Goblin was responsible for her being thrown off the bridge. Spider-Man's attempt to save her wasn't enough to prevent the fatal impact that broke her neck. This event had a huge impact on the story and the character of Spider-Man.
Gwen Stacy can come back to life in certain comic iterations. The circumstances and methods of her return can vary greatly depending on the creative direction of the comic writers.
Stacy in the 'Stacy's Mom Story' is most likely the central character related to her mom. She could be a young girl with her own dreams and aspirations. Maybe she is an artist or a sporty person. Her actions and character would probably be intertwined with her mom's story. For example, if Stacy is into painting, her mom's support or lack of understanding for her passion could be part of the story.
One key plot point is Gwen's relationship with Peter Parker. Their complex dynamic, with love and misunderstandings, drives a lot of the story. Another is her own growth as a character, from a student to someone dealing with the challenges of a world with super - powered beings. Also, the events that lead to her tragic end in some versions are very important plot elements.
In certain comic continuities, Gwen Stacy is alive. However, her status has changed throughout different comic arcs and reboots. Sometimes she's been brought back through various means in the fictional comic world.