#2 Asuka
She isn't completely a loser on the main roster but has for sure fallen from the expectations for her.
She was undefeated for almost 3 years(914 days) in WWE. She holds the record for longest reign as NXT Women's Championship which she relinquished due to injury. On the main roster, she won the first ever women's Royal Rumble and was the sole survivor for Team Raw at Survivor Series. She was first defeated by Charlotte when she submitted on Figure-8 at WrestleMania 34. She hasn't been the same since.
She lost a tag team match to IIconics in her first match on SmackDown. When she was again inserted in SmackDown Women's Championship picture but lost twice to Carmella and Carmella became the first woman to pin Asuka(can you believe it!).
At the age of 36, the fans don't see her become any more successful in WWE and after her Streak of Terror ended, she might just not become what she was before.