#2 Chyna
When Chyna debuted in the WWE in 1997, she was dubbed the Ninth Wonder of the World (Andre the Giant was the eighth) and boy did she look like it. At a time when female competitors in the WWE were mainly there for their looks and sex appeal, Chyna made an impact as the most dominating woman on the roster.
Chyna went on to be an important part of DX, even defeating some of her male counterparts in matches. Unfortunately, her personal issues with Triple H and Stephanie McMahon (a supposed love triangle) led to her being kicked out of the company unceremoniously. From then on began a downward spiral that Chyna could never get out of, with substance and alcohol abuse, stints in the pornographic industry, and only a short stint with NJPW and TNA wrestling. All this tragically culminated in her death due to a drug overdose in April 2016.
One can only imagine the things Chyna could have achieved if not for the unfortunate series of events in her life. After all, Chyna is the woman who laid the foundation for WWE to have physically imposing women like Nia Jax today.