#2 The Undertaker
The Undertaker is a character that was not supposed to survive the 90s, as it's an odd gimmick, but the talent and dedication of Mark Callaway to the character not only helped it survive but thrive for the past 25+ years.
The Undertaker had many iconic feuds over the years and took a WrestleMania undefeated streak 21 straight years, which made him one of the most popular stars that the company has ever created.
He's hung on over the past few years, but after a couple of mediocre performances in 2018, it's clear that he needs to hang them up, and a Hall of Fame induction in 2019 would be the perfect way to do that.
The DeadMan didn't have the Championship success over the years that someone of his standing should have, but he made up for it with incredible character work and consistency, but regardless, he'll always be seen as one of the greatest WWE stars of all time.