#2 Sasha Banks

Sasha Banks has predominantly been portrayed as a face ever since main roster debut back in 2015, except during her initial run with team BAD. Before that, she was regarded as one of the best heels in the whole WWE during her reign as the NXT Women's Champion.
Several best moments of her WWE career came during her heel run. It was speculated that she would turn heel against Bayley during the build towards Wrestlemania 34, but that did not come into fruition.
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Currently, she is scheduled to challenge Ronda Rousey for the Raw Women's Championship at the Royal Rumble. Given the animosity between Ronda Rousey and other two members of horsewomen (Charlotte and Becky), it won't be surprising if Sasha Banks follows the same route.
Charlotte viciously attacked Ronda Rousey at Survivor Series last year after a grueling encounter. If WWE wants to set up a match between the Horsewomen (in the near future), then there are high chances of Sasha attacking Ronda Rousey during the closing stages of their bout.
This will also keep Ronda Rousey busy as she can defend her title against a credible Sasha Banks at the PPVs following Royal Rumble before moving onto bigger things at Wrestlemania 35.