#2 Io Shirai
It has been speculated over the past few days that Io Shirai is unhappy with her position in NXT and that WWE might be looking to move her to RAW or SmackDown so they could keep her. And why wouldn't they, she is an exceptional talent. The Joshi Judas is one of the best wrestlers in the world.
Shirai entering her second consecutive Royal Rumble match could be the beginning of her transition onto the main roster if that is what the company is planning. She would make an instant impact, as she has done as both, a face and a heel in NXT.
One particular moment that could stand out in the entire Rumble match is a staredown between Shirai and her former tag team partner, Kairi Sane. It already happened during one of the many brawls in the build-up to Survivor Series, but an extended confrontation between the two would be sweet.
There are a few interesting things WWE could do with Io Shirai and right now, a great showing at the Royal Rumble might be on top of that list.