Spider-Girl, whose real name was May Parker, lived in a universe where Peter Parker married Mary Jane and had her. She inherited her father's abilities.
But later, Morlun attacked. As a father, Peter sacrificed himself to protect his child, and Spider-Girl became the only Spider-Man in that universe.
Her abilities were no different from Peter Parker's. The only difference was that Morlun had killed her father, so she joined the Spider-Army, preparing to take revenge on the Inheritors.
Spider-Gwen needed little introduction. She was an immensely popular female hero. In her universe, the one bitten by the spider was not Peter Parker, but Gwen Stacy.
In that universe's story, Peter Parker injected himself with lizard serum to take revenge on those who had bullied him in high school, becoming the Lizardman. To stop him from destroying New York, Spider-Gwen fought him fiercely. In the end, Peter Parker died in Gwen's arms.
Silk's origins were also quite interesting. The spider that bit Peter Parker bit her as well. As a result, she was bound to Spider-Man by blood, and whenever Spider-Man saw her, his reproductive instincts awakened. The two sides attracted each other, and their fights would end up in bed.
Amazing Spider-Man's story was widely known. Gwen died in an accident, while Mary Jane was his good friend. That was right—under the current Main Universe setting, Mary Jane was not Spider-Man's second girlfriend. The two were merely good friends.
Surely, some people had already noticed that once Spider-Men from every universe gathered together, Amazing Spider-Man would face an exceptionally awkward situation. Mary Jane, Gwen, and Silk—there were relationships too tangled to explain, emotions impossible to sort out. Amazing Spider-Man simply could not handle it.
Spider-Girl folded her arms and looked at Amazing Spider-Man as though asking, "Are you planning to