Selma is a girl at Cindy and Lance's school (yes they go to school they are top of every class they're in but they still go) and selma has a crush on the same boy that Cindy does causing the two to butt heads a bit, and they're rivals, the boy is named anthony btw, Selma also has a twin sister who has a crush on Cindy's brother Lance named Elizabeth.
Selma has a few abilities like superstrength and superhuman durability and resilience and her elemental power is steel allowing her to create and manipulate the metal and even turn her skin into steel, but it actually makes her stronger and faster by doing so.