Dora Ratjen participated in the Berlin 1936 Olympics. Was replaced by Gretl Bergmann and Ratjen finished in fourth place. She also won a record which soon was taken away (search up why if you want to know).
Arthur's little sister's full name is Dora Winnifred Reid, but goes by D.W. most of the time, which is actually pretty cute together. Old-fashioned, but cute.
A hispanic girl who explorers with her backpack, her map, and her friend boots. Dora and her friends often end up helping other people on their adventures, while trying to stay away from their arch enemy swiper the fox, who always tries to swipe their stuff.