#2 Asuka should become Raw Women's Champion
Asuka is the most dominant female wrestler in the company right now and it would be a waste to add her to the Royal Rumble when her character could be weakened by an elimination at the hands of any of the current roster.
The Undefeated former NXT Women's Champion has now been able to defeat current Champion Alexa Bliss which means that she should be given a shot at the Women's title in the near future.
Giving Asuka the Women's Championship rather than putting her in the Royal Rumble would be a much better option for her since Asuka as the Champion could set up a number of fantasy matches on the Road to WrestleMania.