Spider-Gran

One day working at the library, Leslie was on the ladder packing away new sets of books until she lost her balance and landed on a mysterious man who was holding a black suitcase, injuring him. After the accident, a radioactive spider crawled out from the suitcase and bitten Leslie on her butt which granted her an array of arachnid powers such as web-slinging, wall-crawling and spider sense powers, becoming a crime-fighting vigilante.